Sync from upstream.

.github/workflows/ci.yml

@@ -22,6 +22,11 @@ jobs:
             os: ubuntu-latest
             container: ubuntu:18.04
             install: g++-4.8
+          - toolset: gcc-4.9
+            cxxstd: "03,11"
+            os: ubuntu-latest
+            container: ubuntu:16.04
+            install: g++-4.9
           - toolset: gcc-5
             cxxstd: "03,11,14,1z"
             os: ubuntu-latest
@@ -194,7 +199,7 @@ jobs:
           mkdir -p libs/$LIBRARY
           cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
           git submodule update --init tools/boostdep
-          python3 tools/boostdep/depinst/depinst.py --git_args "--jobs 3" $LIBRARY
+          python3 tools/boostdep/depinst/depinst.py $LIBRARY
           ./bootstrap.sh
           ./b2 -d0 headers
 

CMakeLists.txt

@@ -15,6 +15,8 @@ target_include_directories(boost_compat INTERFACE include)
 target_link_libraries(boost_compat
   INTERFACE
     Boost::assert
+    Boost::config
+    Boost::throw_exception
 )
 
 target_compile_features(boost_compat INTERFACE cxx_std_11)

doc/compat.adoc

@@ -17,8 +17,7 @@ https://www.boost.org/LICENSE_1_0.txt
 
 include::compat/overview.adoc[]
 include::compat/changelog.adoc[]
-include::compat/latch.adoc[]
-include::compat/shared_lock.adoc[]
+include::compat/reference.adoc[]
 include::compat/copyright.adoc[]
 
 :leveloffset: -1

doc/compat/bind_back.adoc

@@ -0,0 +1,58 @@
+////
+Copyright 2024 Peter Dimov
+Distributed under the Boost Software License, Version 1.0.
+https://www.boost.org/LICENSE_1_0.txt
+////
+
+[#bind_back]
+# <boost/compat/bind_back.hpp>
+:idprefix: ref_bind_back_
+
+## Description
+
+The header `<boost/compat/bind_back.hpp>` implements the {cpp}20 function
+`std::bind_back`.
+
+`bind_back` is a limited variant of `std::bind`. It only supports binding
+the last several parameters of a function object to specific argument values.
+
+## Example
+
+```
+struct X
+{
+    void f(int a, int b) const noexcept;
+};
+
+int main()
+{
+    auto fn = boost::compat::bind_back(&X::f, 1, 2);
+
+    X x;
+    fn(x); // calls x.f(1, 2)
+}
+```
+
+## Synopsis
+
+```
+namespace boost
+{
+namespace compat
+{
+
+template<class F, class... A> auto bind_back(F&& f, A&&... a);
+
+} // namespace compat
+} // namespace boost
+```
+
+## bind_back
+
+```
+template<class F, class... A> auto bind_back( F&& f, A&&... a );
+```
+
+[horizontal]
+Returns:;; A function object `fn` such that `fn(b...)` is equivalent to
+  `invoke(f, b..., a...)`.

doc/compat/bind_front.adoc

@@ -0,0 +1,58 @@
+////
+Copyright 2024 Peter Dimov
+Distributed under the Boost Software License, Version 1.0.
+https://www.boost.org/LICENSE_1_0.txt
+////
+
+[#bind_front]
+# <boost/compat/bind_front.hpp>
+:idprefix: ref_bind_front_
+
+## Description
+
+The header `<boost/compat/bind_front.hpp>` implements the {cpp}20 function
+`std::bind_front`.
+
+`bind_front` is a limited variant of `std::bind`. It only supports binding
+the first several parameters of a function object to specific argument values.
+
+## Example
+
+```
+struct X
+{
+    void f(int a, int b) const noexcept;
+};
+
+int main()
+{
+    X x;
+    auto fn = boost::compat::bind_front(&X::f, &x);
+
+    fn(1, 2); // calls x.f(1, 2)
+}
+```
+
+## Synopsis
+
+```
+namespace boost
+{
+namespace compat
+{
+
+template<class F, class... A> auto bind_front(F&& f, A&&... a);
+
+} // namespace compat
+} // namespace boost
+```
+
+## bind_front
+
+```
+template<class F, class... A> auto bind_front(F&& f, A&&... a);
+```
+
+[horizontal]
+Returns:;; A function object `fn` such that `fn(b...)` is equivalent to
+  `invoke(f, a..., b...)`.

doc/compat/changelog.adoc

@@ -8,6 +8,10 @@ https://www.boost.org/LICENSE_1_0.txt
 # Revision History
 :idprefix: changelog_
 
+## Changes in 1.86.0
+
+* Added `bind_front.hpp`, `bind_back.hpp`, `invoke.hpp`, `mem_fn.hpp`, `integer_sequence.hpp` and `type_traits.hpp`.
+
 ## Changes in 1.83.0
 
 * Added `latch.hpp`, an implementation of `std::latch` (contributed by Christian Mazakas.)

doc/compat/copyright.adoc

@@ -8,6 +8,6 @@ https://www.boost.org/LICENSE_1_0.txt
 # Copyright and License
 :idprefix:
 
-This documentation is copyright 2023 Peter Dimov and contributors and is
-distributed under the
+This documentation is copyright 2023, 2024 Peter Dimov and
+contributors and is distributed under the
 http://www.boost.org/LICENSE_1_0.txt[Boost Software License, Version 1.0].

doc/compat/integer_sequence.adoc

@@ -0,0 +1,69 @@
+////
+Copyright 2024 Peter Dimov
+Distributed under the Boost Software License, Version 1.0.
+https://www.boost.org/LICENSE_1_0.txt
+////
+
+[#integer_sequence]
+# <boost/compat/integer_sequence.hpp>
+:idprefix: ref_integer_sequence_
+
+## Description
+
+The header `<boost/compat/integer_sequence.hpp>` implements the {cpp}14 utilities
+`std::integer_sequence`, `std::index_sequence`, `std::make_integer_sequence`,
+`std::make_index_sequence`, and `std::index_sequence_for`.
+
+## Synopsis
+
+```
+namespace boost
+{
+namespace compat
+{
+
+template<class T, T... I> struct integer_sequence;
+
+template<class T, T N> using make_integer_sequence = /*...*/;
+
+template<std::size_t... I> using index_sequence = /*...*/;
+
+template<std::size_t N> using make_index_sequence = /*...*/;
+
+template<class... T> using index_sequence_for = /*...*/;
+
+} // namespace compat
+} // namespace boost
+```
+
+## integer_sequence
+
+```
+template<class T, T... I> struct integer_sequence {};
+```
+
+## make_integer_sequence
+
+```
+template<class T, T N> using make_integer_sequence = /*...*/;
+```
+
+`make_integer_sequence<T, N>` is an alias for `integer_sequence<T, 0, 1, 2, ..., N-1>`.
+
+## index_sequence
+
+```
+template<std::size_t... I> using index_sequence = integer_sequence<std::size_t, I...>;
+```
+
+## make_index_sequence
+
+```
+template<std::size_t N> using make_index_sequence = make_integer_sequence<std::size_t, N>;
+```
+
+## index_sequence_for
+
+```
+template<class... T> using index_sequence_for = make_integer_sequence<std::size_t, sizeof...(T)>;
+```

doc/compat/invoke.adoc

@@ -0,0 +1,130 @@
+////
+Copyright 2024 Peter Dimov
+Distributed under the Boost Software License, Version 1.0.
+https://www.boost.org/LICENSE_1_0.txt
+////
+
+[#invoke]
+# <boost/compat/invoke.hpp>
+:idprefix: ref_invoke_
+
+## Description
+
+The header `<boost/compat/invoke.hpp>` implements the {cpp}17 function
+`std::invoke`, the {cpp}23 function `std::invoke_r`, and the associated
+utilities `invoke_result_t`, `is_invocable`, `is_invocable_r`,
+`is_nothrow_invocable`, and `is_nothrow_invocable_r`.
+
+`invoke(f, a...)` generally returns `f(a...)`, but when `f` is a pointer to
+member, it invokes it as if by returning `mem_fn(f)(a...)`. This allows
+functions, function objects, and pointers to members to be treated uniformly
+by components such as `bind_front`.
+
+`invoke_r<R>(f, a...)` returns `invoke(f, a...)`, converted to `R`.
+
+## Example
+
+```
+struct X
+{
+    void f(int a, int b) const noexcept;
+};
+
+int main()
+{
+    X x;
+    boost::compat::invoke(&X::f, x, 1, 2); // calls x.f(1, 2)
+}
+```
+
+## Synopsis
+
+```
+namespace boost
+{
+namespace compat
+{
+
+template<class F, class... A> auto invoke(F&& f, A&&... a);
+
+template<class F, class... A> using invoke_result_t = /*...*/;
+
+template<class F, class... A> struct is_invocable;
+
+template<class F, class... A> struct is_nothrow_invocable;
+
+template<class R, class F, class... A> R invoke_r(F&& f, A&&... a);
+
+template<class R, class F, class... A> struct is_invocable_r;
+
+template<class R, class F, class... A> struct is_nothrow_invocable_r;
+
+} // namespace compat
+} // namespace boost
+```
+
+## invoke
+
+```
+template<class F, class... A> auto invoke(F&& f, A&&... a) noexcept(/*...*/) -> /*...*/;
+```
+
+[horizontal]
+Returns:;;
+  * `std::forward<F>(f)(std::forward<A>(a)...)`, when `f` is not a pointer to member;
+  * `mem_fn(f)(std::forward<A>(a)...)`, otherwise.
+Constraints:;; the return expression must be valid.
+Remarks:;; The return type is `decltype(r)`, and the `noexcept` clause is `noexcept(noexcept(r))`, where `r` is the return expression.
+
+## invoke_result_t
+
+```
+template<class F, class... A> using invoke_result_t =
+  decltype( invoke(std::declval<F>(), std::declval<A>()...) );
+```
+
+## is_invocable
+
+```
+template<class F, class... A> struct is_invocable: public /*...*/;
+```
+
+The base class of `is_invocable<F, A...>` is `std::true_type` when `invoke(std::declval<F>(), std::declval<A>()...)` is a valid expression, `std::false_type` otherwise.
+
+## is_nothrow_invocable
+
+```
+template<class F, class... A> struct is_nothrow_invocable: public /*...*/;
+```
+
+The base class of `is_nothrow_invocable<F, A...>` is `std::false_type` when `is_invocable<F, A...>::value` is `false`, `std::integral_constant<bool, noexcept(invoke(std::declval<F>(), std::declval<A>()...))>` otherwise.
+
+## invoke_r
+
+```
+template<class R, class F, class... A> R invoke_r(F&& f, A&&... a) noexcept(/*...*/);
+```
+
+[horizontal]
+Returns:;;
+  * `static_cast<R>(invoke(std::forward<F>(f), std::forward<A>(a)...))`, when `R` is (possibly cv-qualified) `void`;
+  * `invoke(std::forward<F>(f), std::forward<A>(a)...)`, implicitly converted to `R`, otherwise.
+Constraints:;; `is_invocable<F, A...>::value` must be `true` and, if `R` is not cv `void`, `std::is_convertible<invoke_result_t<F, A...>, R>::value` must be `true`.
+Remarks:;; The `noexcept` clause is `noexcept(noexcept(static_cast<R>(invoke(std::forward<F>(f), std::forward<A>(a)...))))`.
+
+## is_invocable_r
+
+```
+template<class R, class F, class... A> struct is_invocable: public /*...*/;
+```
+
+The base class of `is_invocable_r<R, F, A...>` is `std::true_type` when `invoke_r<R>(std::declval<F>(), std::declval<A>()...)` is a valid expression, `std::false_type` otherwise.
+
+## is_nothrow_invocable_r
+
+```
+template<class R, class F, class... A> struct is_nothrow_invocable: public /*...*/;
+```
+
+The base class of `is_nothrow_invocable<R, F, A...>` is `std::false_type` when `is_invocable_r<R, F, A...>::value` is `false`, `std::integral_constant<bool, noexcept(invoke_r<R>(std::declval<F>(), std::declval<A>()...))>` otherwise.
+

doc/compat/latch.adoc

@@ -6,7 +6,7 @@ https://www.boost.org/LICENSE_1_0.txt
 
 [#latch]
 # <boost/compat/latch.hpp>
-:idprefix: latch_
+:idprefix: ref_latch_
 
 ## Description
 

doc/compat/mem_fn.adoc

@@ -0,0 +1,67 @@
+////
+Copyright 2024 Peter Dimov
+Distributed under the Boost Software License, Version 1.0.
+https://www.boost.org/LICENSE_1_0.txt
+////
+
+[#mem_fn]
+# <boost/compat/mem_fn.hpp>
+:idprefix: ref_mem_fn_
+
+## Description
+
+The header `<boost/compat/mem_fn.hpp>` implements the {cpp}11 function
+`std::mem_fn`.
+
+`mem_fn(pm)`, where `pm` is a pointer to member, returns a function object
+that can be used to invoke the member function, or obtain a reference to the
+data member, using a function call syntax.
+
+Even though `std::mem_fn` is {cpp}11, later standards place stricter
+requirements on the returned function object (it needs to be SFINAE friendly
+and propagate `noexcept` correctly.) `boost::compat::mem_fn` implements
+these stricter requirements.
+
+## Example
+
+```
+struct X
+{
+    void f(int a, int b) const noexcept;
+};
+
+int main()
+{
+    auto fn = boost::compat::mem_fn(&X::f);
+
+    X x;
+    fn(x, 1, 2); // calls x.f(1, 2)
+}
+```
+
+## Synopsis
+
+```
+namespace boost
+{
+namespace compat
+{
+
+template<class M, class T> auto mem_fn(M T::* pm) noexcept;
+
+} // namespace compat
+} // namespace boost
+```
+
+## mem_fn
+
+```
+template<class M, class T> auto mem_fn(M T::* pm) noexcept;
+```
+
+[horizontal]
+Returns:;; A function object `fn` such that:
+  * `fn(x, a...)` is equivalent to `(x.*pm)(a...)`, when `M` is a function type and the type of `X` is `T` or derived from `T`;
+  * `fn(x, a...)` is equivalent to `((*x).*pm)(a...)`, when `M` is a function type and the type of `X` is not `T` or derived from `T`;
+  * `fn(x)` is equivalent to `x.*pm`, when `M` is an object type and the type of `X` is `T` or derived from `T`;
+  * `fn(x)` is equivalent to `(*x).*pm`, when `M` is an object type and the type of `X` is not `T` or derived from `T`.

doc/compat/reference.adoc

@@ -0,0 +1,14 @@
+////
+Copyright 2024 Peter Dimov
+Distributed under the Boost Software License, Version 1.0.
+https://www.boost.org/LICENSE_1_0.txt
+////
+
+include::bind_back.adoc[]
+include::bind_front.adoc[]
+include::integer_sequence.adoc[]
+include::invoke.adoc[]
+include::latch.adoc[]
+include::mem_fn.adoc[]
+include::shared_lock.adoc[]
+include::type_traits.adoc[]

doc/compat/shared_lock.adoc

@@ -6,7 +6,7 @@ https://www.boost.org/LICENSE_1_0.txt
 
 [#shared_lock]
 # <boost/compat/shared_lock.hpp>
-:idprefix: shared_lock_
+:idprefix: ref_shared_lock_
 
 ## Description
 
@@ -129,7 +129,7 @@ shared_lock( mutex_type& m, std::adopt_lock_t );
 [horizontal]
 Preconditions:;; `m` must be held by a previous call to `m.lock_shared()` or a
 successful call to `m.try_lock_shared()`.
-PostConditions:;; `mutex() == std::addressof(m)` and `owns_lock() == true`.
+Postconditions:;; `mutex() == std::addressof(m)` and `owns_lock() == true`.
 
 ### Copy Constructor
 

doc/compat/type_traits.adoc

@@ -0,0 +1,45 @@
+////
+Copyright 2024 Peter Dimov
+Distributed under the Boost Software License, Version 1.0.
+https://www.boost.org/LICENSE_1_0.txt
+////
+
+[#type_traits]
+# <boost/compat/type_traits.hpp>
+:idprefix: ref_type_traits_
+
+## Description
+
+The header `<boost/compat/type_traits.hpp>` implements some of the
+post-{cpp}11 additions to the standard header `<type_traits>`.
+
+## Synopsis
+
+```
+#include <type_traits>
+
+namespace boost
+{
+namespace compat
+{
+
+template<class T> using remove_const_t = typename std::remove_const<T>::type;
+
+template<class T> using remove_cv_t = typename std::remove_cv<T>::type;
+
+template<class T> using remove_reference_t = typename std::remove_reference<T>::type;
+
+template<class T> using remove_cvref_t = remove_cv_t<remove_reference_t<T>>;
+
+template<class T> using decay_t = typename std::decay<T>::type;
+
+template<bool B, class T = void> using enable_if_t = typename std::enable_if<B, T>::type;
+
+template<bool B, class T, class F> using conditional_t = typename std::conditional<B, T, F>::type;
+
+template<class... T> using void_t = void;
+
+
+} // namespace compat
+} // namespace boost
+```

include/boost/compat/bind_back.hpp

@@ -0,0 +1,72 @@
+#ifndef BOOST_COMPAT_BIND_BACK_HPP_INCLUDED
+#define BOOST_COMPAT_BIND_BACK_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/compat/type_traits.hpp>
+#include <boost/compat/integer_sequence.hpp>
+#include <boost/compat/detail/returns.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <tuple>
+#include <utility>
+
+namespace boost {
+namespace compat {
+
+namespace detail {
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+# pragma warning(push)
+# pragma warning(disable: 4100) // 'a': unreferenced formal parameter
+#endif
+
+template<class F, class A, class... B, std::size_t... I>
+static constexpr auto invoke_bind_back_( F&& f, A&& a, index_sequence<I...>, B&&... b )
+    BOOST_COMPAT_RETURNS( compat::invoke( std::forward<F>(f), std::forward<B>(b)..., std::get<I>( std::forward<A>(a) )... ) )
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+# pragma warning(pop)
+#endif
+
+template<class F, class... A> class bind_back_
+{
+private:
+
+    F f_;
+    std::tuple<A...> a_;
+
+public:
+
+    template<class F2, class... A2>
+    constexpr bind_back_( F2&& f2, A2&&... a2 ): f_( std::forward<F2>(f2) ), a_( std::forward<A2>(a2)... ) {}
+
+public:
+
+    template<class... B> BOOST_CXX14_CONSTEXPR auto operator()( B&&... b ) &
+        BOOST_COMPAT_RETURNS( detail::invoke_bind_back_( f_, a_, make_index_sequence<sizeof...(A)>(), std::forward<B>(b)... ) )
+
+    template<class... B> constexpr auto operator()( B&&... b ) const &
+        BOOST_COMPAT_RETURNS( detail::invoke_bind_back_( f_, a_, make_index_sequence<sizeof...(A)>(), std::forward<B>(b)... ) )
+
+    template<class... B> BOOST_CXX14_CONSTEXPR auto operator()( B&&... b ) &&
+        BOOST_COMPAT_RETURNS( detail::invoke_bind_back_( std::move(f_), std::move(a_), make_index_sequence<sizeof...(A)>(), std::forward<B>(b)... ) )
+
+    template<class... B> constexpr auto operator()( B&&... b ) const &&
+        BOOST_COMPAT_RETURNS( detail::invoke_bind_back_( std::move(f_), std::move(a_), make_index_sequence<sizeof...(A)>(), std::forward<B>(b)... ) )
+};
+
+} // namespace detail
+
+template<class F, class... A> constexpr auto bind_back( F&& f, A&&... a ) -> detail::bind_back_< decay_t<F>, decay_t<A>... >
+{
+    return { std::forward<F>(f), std::forward<A>(a)... };
+}
+
+} // namespace compat
+} // namespace boost
+
+#endif // BOOST_COMPAT_BIND_BACK_HPP_INCLUDED

include/boost/compat/bind_front.hpp

@@ -0,0 +1,72 @@
+#ifndef BOOST_COMPAT_BIND_FRONT_HPP_INCLUDED
+#define BOOST_COMPAT_BIND_FRONT_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/compat/type_traits.hpp>
+#include <boost/compat/integer_sequence.hpp>
+#include <boost/compat/detail/returns.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <tuple>
+#include <utility>
+
+namespace boost {
+namespace compat {
+
+namespace detail {
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+# pragma warning(push)
+# pragma warning(disable: 4100) // 'a': unreferenced formal parameter
+#endif
+
+template<class F, class A, class... B, std::size_t... I>
+static constexpr auto invoke_bind_front_( F&& f, A&& a, index_sequence<I...>, B&&... b )
+    BOOST_COMPAT_RETURNS( compat::invoke( std::forward<F>(f), std::get<I>( std::forward<A>(a) )..., std::forward<B>(b)... ) )
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+# pragma warning(pop)
+#endif
+
+template<class F, class... A> class bind_front_
+{
+private:
+
+    F f_;
+    std::tuple<A...> a_;
+
+public:
+
+    template<class F2, class... A2>
+    constexpr bind_front_( F2&& f2, A2&&... a2 ): f_( std::forward<F2>(f2) ), a_( std::forward<A2>(a2)... ) {}
+
+public:
+
+    template<class... B> BOOST_CXX14_CONSTEXPR auto operator()( B&&... b ) &
+        BOOST_COMPAT_RETURNS( detail::invoke_bind_front_( f_, a_, make_index_sequence<sizeof...(A)>(), std::forward<B>(b)... ) )
+
+    template<class... B> constexpr auto operator()( B&&... b ) const &
+        BOOST_COMPAT_RETURNS( detail::invoke_bind_front_( f_, a_, make_index_sequence<sizeof...(A)>(), std::forward<B>(b)... ) )
+
+    template<class... B> BOOST_CXX14_CONSTEXPR auto operator()( B&&... b ) &&
+        BOOST_COMPAT_RETURNS( detail::invoke_bind_front_( std::move(f_), std::move(a_), make_index_sequence<sizeof...(A)>(), std::forward<B>(b)... ) )
+
+    template<class... B> constexpr auto operator()( B&&... b ) const &&
+        BOOST_COMPAT_RETURNS( detail::invoke_bind_front_( std::move(f_), std::move(a_), make_index_sequence<sizeof...(A)>(), std::forward<B>(b)... ) )
+};
+
+} // namespace detail
+
+template<class F, class... A> constexpr auto bind_front( F&& f, A&&... a ) -> detail::bind_front_< decay_t<F>, decay_t<A>... >
+{
+    return { std::forward<F>(f), std::forward<A>(a)... };
+}
+
+} // namespace compat
+} // namespace boost
+
+#endif // BOOST_COMPAT_BIND_FRONT_HPP_INCLUDED

include/boost/compat/detail/returns.hpp

@@ -0,0 +1,10 @@
+#ifndef BOOST_COMPAT_DETAIL_RETURNS_HPP_INCLUDED
+#define BOOST_COMPAT_DETAIL_RETURNS_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#define BOOST_COMPAT_RETURNS(...) noexcept(noexcept(__VA_ARGS__)) -> decltype(__VA_ARGS__) { return __VA_ARGS__; }
+
+#endif // BOOST_COMPAT_DETAIL_RETURNS_HPP_INCLUDED

include/boost/compat/integer_sequence.hpp

@@ -0,0 +1,120 @@
+#ifndef BOOST_COMPAT_INTEGER_SEQUENCE_HPP_INCLUDED
+#define BOOST_COMPAT_INTEGER_SEQUENCE_HPP_INCLUDED
+
+// Copyright 2015, 2017, 2019 Peter Dimov.
+//
+// Distributed under the Boost Software License, Version 1.0.
+//
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+
+#include <cstddef>
+
+#if defined(_MSC_VER) || defined(__GNUC__)
+# pragma push_macro( "I" )
+# undef I
+#endif
+
+#if defined(__has_builtin)
+# if __has_builtin(__make_integer_seq)
+#  define BOOST_COMPAT_HAS_MAKE_INTEGER_SEQ
+# endif
+#endif
+
+namespace boost
+{
+namespace compat
+{
+
+// integer_sequence
+template<class T, T... I> struct integer_sequence
+{
+};
+
+#if defined(BOOST_COMPAT_HAS_MAKE_INTEGER_SEQ)
+
+template<class T, T N> using make_integer_sequence = __make_integer_seq<integer_sequence, T, N>;
+
+#else
+
+// detail::make_integer_sequence_impl
+namespace detail
+{
+
+// iseq_if_c
+template<bool C, class T, class E> struct iseq_if_c_impl;
+
+template<class T, class E> struct iseq_if_c_impl<true, T, E>
+{
+    using type = T;
+};
+
+template<class T, class E> struct iseq_if_c_impl<false, T, E>
+{
+    using type = E;
+};
+
+template<bool C, class T, class E> using iseq_if_c = typename iseq_if_c_impl<C, T, E>::type;
+
+// iseq_identity
+template<class T> struct iseq_identity
+{
+    using type = T;
+};
+
+template<class S1, class S2> struct append_integer_sequence;
+
+template<class T, T... I, T... J> struct append_integer_sequence<integer_sequence<T, I...>, integer_sequence<T, J...>>
+{
+    using type = integer_sequence< T, I..., ( J + sizeof...(I) )... >;
+};
+
+template<class T, T N> struct make_integer_sequence_impl;
+
+template<class T, T N> struct make_integer_sequence_impl_
+{
+private:
+
+    static_assert( N >= 0, "make_integer_sequence<T, N>: N must not be negative" );
+
+    static T const M = N / 2;
+    static T const R = N % 2;
+
+    using S1 = typename make_integer_sequence_impl<T, M>::type;
+    using S2 = typename append_integer_sequence<S1, S1>::type;
+    using S3 = typename make_integer_sequence_impl<T, R>::type;
+    using S4 = typename append_integer_sequence<S2, S3>::type;
+
+public:
+
+    using type = S4;
+};
+
+template<class T, T N> struct make_integer_sequence_impl: iseq_if_c<N == 0, iseq_identity<integer_sequence<T>>, iseq_if_c<N == 1, iseq_identity<integer_sequence<T, 0>>, make_integer_sequence_impl_<T, N> > >
+{
+};
+
+} // namespace detail
+
+// make_integer_sequence
+template<class T, T N> using make_integer_sequence = typename detail::make_integer_sequence_impl<T, N>::type;
+
+#endif // defined(BOOST_COMPAT_HAS_MAKE_INTEGER_SEQ)
+
+// index_sequence
+template<std::size_t... I> using index_sequence = integer_sequence<std::size_t, I...>;
+
+// make_index_sequence
+template<std::size_t N> using make_index_sequence = make_integer_sequence<std::size_t, N>;
+
+// index_sequence_for
+template<class... T> using index_sequence_for = make_integer_sequence<std::size_t, sizeof...(T)>;
+
+} // namespace compat
+} // namespace boost
+
+#if defined(_MSC_VER) || defined(__GNUC__)
+# pragma pop_macro( "I" )
+#endif
+
+#endif // #ifndef BOOST_COMPAT_INTEGER_SEQUENCE_HPP_INCLUDED

include/boost/compat/invoke.hpp

@@ -0,0 +1,119 @@
+#ifndef BOOST_COMPAT_INVOKE_HPP_INCLUDED
+#define BOOST_COMPAT_INVOKE_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/mem_fn.hpp>
+#include <boost/compat/type_traits.hpp>
+#include <boost/compat/detail/returns.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <utility>
+
+namespace boost {
+namespace compat {
+
+// invoke
+
+template<class F, class... A>
+constexpr auto invoke( F&& f, A&&... a )
+BOOST_COMPAT_RETURNS( std::forward<F>(f)(std::forward<A>(a)...) )
+
+template<class M, class T, class... A>
+constexpr auto invoke( M T::* pm, A&&... a )
+BOOST_COMPAT_RETURNS( compat::mem_fn(pm)(std::forward<A>(a)...) )
+
+// invoke_result_t
+
+template<class F, class... A> using invoke_result_t = decltype( compat::invoke( std::declval<F>(), std::declval<A>()... ) );
+
+// is_invocable
+
+namespace detail {
+
+template<class, class F, class... A> struct is_invocable_: std::false_type {};
+template<class F, class... A> struct is_invocable_< void_t<invoke_result_t<F, A...>>, F, A... >: std::true_type {};
+
+} // namespace detail
+
+template<class F, class... A> struct is_invocable: detail::is_invocable_<void, F, A...> {};
+
+// is_nothrow_invocable
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+
+template<class F, class... A> struct is_nothrow_invocable: std::false_type {};
+
+#else
+
+namespace detail {
+
+template<class F, class... A> struct is_nothrow_invocable_
+{
+    using type = std::integral_constant<bool, noexcept( compat::invoke( std::declval<F>(), std::declval<A>()... ) )>;
+};
+
+} // namespace detail
+
+template<class F, class... A> struct is_nothrow_invocable: conditional_t< is_invocable<F, A...>::value, detail::is_nothrow_invocable_<F, A...>, std::false_type >::type {};
+
+#endif
+
+// invoke_r
+
+template<class R, class F, class... A, class En = enable_if_t<
+    std::is_void<R>::value && is_invocable<F, A...>::value >>
+constexpr R invoke_r( F&& f, A&&... a )
+    noexcept( noexcept( static_cast<R>( compat::invoke( std::forward<F>(f), std::forward<A>(a)... ) ) ) )
+{
+    return static_cast<R>( compat::invoke( std::forward<F>(f), std::forward<A>(a)... ) );
+}
+
+template<class R, class F, class... A, class = void, class En = enable_if_t<
+    !std::is_void<R>::value && std::is_convertible< invoke_result_t<F, A...>, R >::value >>
+constexpr R invoke_r( F&& f, A&&... a )
+    noexcept( noexcept( static_cast<R>( compat::invoke( std::forward<F>(f), std::forward<A>(a)... ) ) ) )
+{
+    return compat::invoke( std::forward<F>(f), std::forward<A>(a)... );
+}
+
+// is_invocable_r
+
+namespace detail {
+
+template<class R, class F, class... A> struct is_invocable_r_: std::is_convertible< invoke_result_t<F, A...>, R > {};
+
+} // namespace detail
+
+template<class R, class F, class... A> struct is_invocable_r:
+    conditional_t< !is_invocable<F, A...>::value, std::false_type,
+    conditional_t< std::is_void<R>::value, std::true_type,
+    detail::is_invocable_r_<R, F, A...> >> {};
+
+// is_nothrow_invocable_r
+
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+
+template<class R, class F, class... A> struct is_nothrow_invocable_r: std::false_type {};
+
+#else
+
+namespace detail {
+
+template<class R, class F, class... A> struct is_nothrow_invocable_r_
+{
+    using type = std::integral_constant<bool, noexcept( compat::invoke_r<R>( std::declval<F>(), std::declval<A>()... ) )>;
+};
+
+} // namespace detail
+
+template<class R, class F, class... A> struct is_nothrow_invocable_r: conditional_t< is_invocable_r<R, F, A...>::value, detail::is_nothrow_invocable_r_<R, F, A...>, std::false_type >::type {};
+
+#endif
+
+} // namespace compat
+} // namespace boost
+
+#endif // BOOST_COMPAT_INVOKE_HPP_INCLUDED

include/boost/compat/mem_fn.hpp

@@ -0,0 +1,78 @@
+#ifndef BOOST_COMPAT_MEM_FN_HPP_INCLUDED
+#define BOOST_COMPAT_MEM_FN_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/type_traits.hpp>
+#include <boost/compat/detail/returns.hpp>
+#include <functional>
+
+namespace boost {
+namespace compat {
+
+namespace detail {
+
+template<class T, class U, class Td = remove_cvref_t<T>, class Ud = remove_cvref_t<U>>
+struct is_same_or_base: std::integral_constant<bool, std::is_same<Td, Ud>::value || std::is_base_of<Td, Ud>::value>
+{
+};
+
+template<class T> struct is_reference_wrapper_: std::false_type {};
+template<class T> struct is_reference_wrapper_< std::reference_wrapper<T> >: std::true_type {};
+
+template<class T> struct is_reference_wrapper: is_reference_wrapper_< remove_cvref_t<T> > {};
+
+template<class M, class T> struct _mfn
+{
+    M T::* pm_;
+
+    template<class U, class... A, class En = enable_if_t<is_same_or_base<T, U>::value>>
+    constexpr auto operator()( U&& u, A&&... a ) const
+    BOOST_COMPAT_RETURNS( (std::forward<U>(u).*pm_)( std::forward<A>(a)... ) )
+
+    template<class U, class... A, class = void, class En = enable_if_t< !is_same_or_base<T, U>::value && is_reference_wrapper<U>::value>>
+    constexpr auto operator()( U&& u, A&&... a ) const
+    BOOST_COMPAT_RETURNS( (u.get().*pm_)( std::forward<A>(a)... ) )
+
+    template<class U, class... A, class = void, class = void, class En = enable_if_t< !is_same_or_base<T, U>::value && !is_reference_wrapper<U>::value>>
+    constexpr auto operator()( U&& u, A&&... a ) const
+    BOOST_COMPAT_RETURNS( ((*std::forward<U>(u)).*pm_)( std::forward<A>(a)... ) )
+};
+
+template<class M, class T> struct _md
+{
+    M T::* pm_;
+
+    template<class U, class En = enable_if_t<is_same_or_base<T, U>::value>>
+    constexpr auto operator()( U&& u ) const
+    BOOST_COMPAT_RETURNS( std::forward<U>(u).*pm_ )
+
+    template<class U, class = void, class En = enable_if_t< !is_same_or_base<T, U>::value && is_reference_wrapper<U>::value>>
+    constexpr auto operator()( U&& u ) const
+    BOOST_COMPAT_RETURNS( u.get().*pm_ )
+
+    template<class U, class = void, class = void, class En = enable_if_t< !is_same_or_base<T, U>::value && !is_reference_wrapper<U>::value>>
+    constexpr auto operator()( U&& u ) const
+    BOOST_COMPAT_RETURNS( (*std::forward<U>(u)).*pm_ )
+};
+
+} // namespace detail
+
+template<class M, class T, class En = enable_if_t< std::is_function<M>::value > >
+constexpr auto mem_fn( M T::* pm ) noexcept -> detail::_mfn<M, T>
+{
+    return detail::_mfn<M, T>{ pm };
+}
+
+template<class M, class T, class = void, class En = enable_if_t< !std::is_function<M>::value > >
+constexpr auto mem_fn( M T::* pm ) noexcept -> detail::_md<M, T>
+{
+    return detail::_md<M, T>{ pm };
+}
+
+} // namespace compat
+} // namespace boost
+
+#endif // BOOST_COMPAT_MEM_FN_HPP_INCLUDED

include/boost/compat/type_traits.hpp

@@ -0,0 +1,38 @@
+#ifndef BOOST_COMPAT_TYPE_TRAITS_HPP_INCLUDED
+#define BOOST_COMPAT_TYPE_TRAITS_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <type_traits>
+
+namespace boost {
+namespace compat {
+
+template<class T> using remove_const_t = typename std::remove_const<T>::type;
+template<class T> using remove_cv_t = typename std::remove_cv<T>::type;
+template<class T> using remove_reference_t = typename std::remove_reference<T>::type;
+template<class T> using remove_cvref_t = remove_cv_t< remove_reference_t<T> >;
+
+template<class T> using decay_t = typename std::decay<T>::type;
+
+template<bool B, class T = void> using enable_if_t = typename std::enable_if<B, T>::type;
+
+template<bool B, class T, class F> using conditional_t = typename std::conditional<B, T, F>::type;
+
+namespace detail {
+
+template<class...> struct make_void
+{
+    using type = void;
+};
+
+} // namespace detail
+
+template<class... T> using void_t = typename detail::make_void<T...>::type;
+
+} // namespace compat
+} // namespace boost
+
+#endif // BOOST_COMPAT_TYPE_TRAITS_HPP_INCLUDED

meta/libraries.json

@@ -2,7 +2,8 @@
     "key": "compat",
     "name": "Compat",
     "authors": [
-        "Peter Dimov"
+        "Peter Dimov",
+        "Christian Mazakas"
     ],
     "maintainers": [
         "Peter Dimov <pdimov -at- gmail.com>"

test/CMakeLists.txt

@@ -8,6 +8,7 @@ if(HAVE_BOOST_TEST)
 
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
-boost_test_jamfile(FILE Jamfile LINK_LIBRARIES Boost::compat Boost::core Threads::Threads)
+
+boost_test_jamfile(FILE Jamfile LINK_LIBRARIES Boost::compat Boost::core Boost::mp11 Threads::Threads)
 
 endif()

test/Jamfile

@@ -27,5 +27,72 @@ project
 run quick.cpp ;
 
 run latch_test.cpp ;
+
 run shared_lock_test.cpp ;
 run shared_lock_test.cpp : : : <exception-handling>off : shared_lock_test_nx ;
+
+run invoke_fn_test.cpp ;
+run invoke_obj_test.cpp ;
+run invoke_mfn_test.cpp ;
+run invoke_md_test.cpp ;
+
+run mem_fn_mfn_test.cpp ;
+run mem_fn_md_test.cpp ;
+
+run invoke_fn_noexcept_test.cpp ;
+run invoke_obj_noexcept_test.cpp ;
+run invoke_mfn_noexcept_test.cpp ;
+run invoke_md_noexcept_test.cpp ;
+
+compile invoke_fn_constexpr_test.cpp ;
+compile invoke_obj_constexpr_test.cpp ;
+compile invoke_mfn_constexpr_test.cpp
+  : <toolset>gcc-4.8:<build>no <toolset>gcc-4.9:<build>no ;
+compile invoke_md_constexpr_test.cpp
+  : <toolset>gcc-4.8:<build>no <toolset>gcc-4.9:<build>no ;
+
+run invoke_result_test.cpp ;
+run is_invocable_test.cpp ;
+run is_nothrow_invocable_test.cpp ;
+
+run bind_front_fn_test.cpp ;
+run bind_front_obj_test.cpp ;
+run bind_front_mfn_test.cpp ;
+run bind_front_md_test.cpp ;
+
+compile bind_front_fn_constexpr_test.cpp ;
+compile bind_front_obj_constexpr_test.cpp ;
+compile bind_front_mfn_constexpr_test.cpp ;
+compile bind_front_md_constexpr_test.cpp ;
+
+run integer_sequence_test.cpp ;
+
+run bind_back_fn_test.cpp ;
+run bind_back_obj_test.cpp ;
+run bind_back_mfn_test.cpp ;
+run bind_back_md_test.cpp ;
+
+compile bind_back_fn_constexpr_test.cpp ;
+compile bind_back_obj_constexpr_test.cpp ;
+compile bind_back_mfn_constexpr_test.cpp ;
+compile bind_back_md_constexpr_test.cpp ;
+
+run invoke_r_fn_test.cpp ;
+run invoke_r_obj_test.cpp ;
+run invoke_r_mfn_test.cpp ;
+run invoke_r_md_test.cpp ;
+
+run invoke_r_fn_noexcept_test.cpp ;
+run invoke_r_obj_noexcept_test.cpp ;
+run invoke_r_mfn_noexcept_test.cpp ;
+run invoke_r_md_noexcept_test.cpp ;
+
+compile invoke_r_fn_constexpr_test.cpp ;
+compile invoke_r_obj_constexpr_test.cpp ;
+compile invoke_r_mfn_constexpr_test.cpp
+  : <toolset>gcc-4.8:<build>no <toolset>gcc-4.9:<build>no ;
+compile invoke_r_md_constexpr_test.cpp
+  : <toolset>gcc-4.8:<build>no <toolset>gcc-4.9:<build>no ;
+
+run is_invocable_r_test.cpp ;
+run is_nothrow_invocable_r_test.cpp ;

test/bind_back_fn_constexpr_test.cpp

@@ -0,0 +1,60 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/bind_back.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+constexpr int f0()
+{
+    return -1;
+}
+
+constexpr int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+constexpr int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+constexpr int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( boost::compat::bind_back( f0 )(), -1 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f1 )( 1 ), 1 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f2 )( 1, 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f3 )( 1, 2, 3 ), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_back( f1, 1 )(), 1 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f2, 1 )( 2 ), 21 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f3, 1 )( 2, 3 ), 231 );
+
+    BOOST_TEST_EQ( boost::compat::bind_back( f2, 1, 2 )(), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f3, 1, 2 )( 3 ), 312 );
+
+    BOOST_TEST_EQ( boost::compat::bind_back( f3, 1, 2, 3 )(), 123 );
+}
+
+#endif

test/bind_back_fn_test.cpp

@@ -0,0 +1,57 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/bind_back.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <memory>
+
+int f0()
+{
+    return -1;
+}
+
+int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int g( std::unique_ptr<int> p, std::unique_ptr<int> q )
+{
+    return 10 * *p + *q;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( boost::compat::bind_back( f0 )(), -1 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f1 )( 1 ), 1 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f2 )( 1, 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f3 )( 1, 2, 3 ), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_back( f1, 1 )(), 1 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f2, 1 )( 2 ), 21 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f3, 1 )( 2, 3 ), 231 );
+
+    BOOST_TEST_EQ( boost::compat::bind_back( f2, 1, 2 )(), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_back( f3, 1, 2 )( 3 ), 312 );
+
+    BOOST_TEST_EQ( boost::compat::bind_back( f3, 1, 2, 3 )(), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_back( g, std::unique_ptr<int>( new int(1) ) )( std::unique_ptr<int>( new int(2) ) ), 21 );
+
+    return boost::report_errors();
+}

test/bind_back_md_constexpr_test.cpp

@@ -0,0 +1,58 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_back.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, X() )(), -1 );
+    }
+
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &x )(), -1 );
+    }
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, >= 1920 && BOOST_MSVC < 1940)
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, Y() )(), -1 );
+    }
+
+    {
+        constexpr Y y = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, y )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &y )(), -1 );
+    }
+
+#endif
+}
+
+#endif

test/bind_back_md_test.cpp

@@ -0,0 +1,101 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_back.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, X() )(), -1 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, Y() )(), -1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, x )(), -1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &x )(), -1 );
+        boost::compat::bind_back( &X::m, &x )() = +1;
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &x )(), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(x) )(), -1 );
+        boost::compat::bind_back( &X::m, std::ref(x) )() = +1;
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(x) )(), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::cref(x) )(), -1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, y )(), -1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &y )(), -1 );
+        boost::compat::bind_back( &X::m, &y )() = +1;
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &y )(), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(y) )(), -1 );
+        boost::compat::bind_back( &X::m, std::ref(y) )() = +1;
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(y) )(), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::cref(y) )(), -1 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(x) )(), -1 );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, y )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &y )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(y) )(), -1 );
+    }
+
+    return boost::report_errors();
+}

test/bind_back_mfn_constexpr_test.cpp

@@ -0,0 +1,137 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/bind_back.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct X
+{
+    constexpr int f0()
+    {
+        return -1;
+    }
+
+    constexpr int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    constexpr int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( X() ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( X(), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, X(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, X(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, X(), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( X() ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( X() ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( X() ), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( Y() ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( Y(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( Y(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( Y(), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, Y(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, Y(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, Y(), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( Y() ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( Y() ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( Y() ), 123 );
+    }
+
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( x ), 123 );
+    }
+
+    {
+        constexpr Y x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( x ), 123 );
+    }
+
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, &x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( &x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( &x ), 123 );
+    }
+
+    {
+        constexpr Y x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, &x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( &x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( &x ), 123 );
+    }
+}
+
+#endif

test/bind_back_mfn_test.cpp

@@ -0,0 +1,308 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/bind_back.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+#include <memory>
+
+struct X
+{
+    int f0()
+    {
+        return -1;
+    }
+
+    int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( X() ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( X(), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, X(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, X(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, X(), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( X() ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( X() ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( X() ), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( Y() ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( Y(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( Y(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( Y(), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, Y(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, Y(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, Y(), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( Y() ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( Y() ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( Y() ), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( x ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, x, 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( x ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( x ), 123 );
+    }
+
+    {
+        Y x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( x ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, x, 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( x ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( x ), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( &x ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, &x, 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, &x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( &x ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( &x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( &x ), 123 );
+    }
+
+    {
+        Y x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( &x ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, &x, 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, &x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( &x ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( &x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( &x ), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( std::ref(x) ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( std::ref(x), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, std::ref(x), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, std::ref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, std::ref(x), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( std::ref(x) ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( std::ref(x) ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( std::ref(x) ), 123 );
+    }
+
+    {
+        Y x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f0 )( std::ref(x) ), -1 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1 )( std::ref(x), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, std::ref(x), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, std::ref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, std::ref(x), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f1, 1 )( std::ref(x) ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( std::ref(x) ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( std::ref(x) ), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( std::cref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( std::cref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, std::cref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, std::cref(x), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( std::cref(x) ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( std::cref(x) ), 123 );
+    }
+
+    {
+        Y x;
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( std::cref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( std::cref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, std::cref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, std::cref(x), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( std::cref(x) ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( std::cref(x) ), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( x ), 123 );
+    }
+
+    {
+        Y const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( x ), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, &x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( &x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( &x ), 123 );
+    }
+
+    {
+        Y const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, &x, 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( &x ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( &x ), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, std::ref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, std::ref(x), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( std::ref(x) ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( std::ref(x) ), 123 );
+    }
+
+    {
+        Y const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, std::ref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, std::ref(x), 1, 2, 3 )(), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f2, 1, 2 )( std::ref(x) ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( std::ref(x) ), 123 );
+    }
+
+    {
+        std::unique_ptr<X> px( new X );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( std::move(px) ), 123 );
+    }
+
+    {
+        std::unique_ptr<Y> px( new Y );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, 1, 2, 3 )( std::move(px) ), 123 );
+    }
+
+    {
+        std::unique_ptr<X> px( new X );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, std::move(px), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        std::unique_ptr<Y> px( new Y );
+        BOOST_TEST_EQ( boost::compat::bind_back( &X::f3, std::move(px), 1, 2, 3 )(), 123 );
+    }
+
+    return boost::report_errors();
+}

test/bind_back_obj_constexpr_test.cpp

@@ -0,0 +1,96 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_back.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct F1
+{
+    constexpr int operator()()
+    {
+        return -1;
+    }
+
+    constexpr int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    constexpr int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct F2
+{
+    constexpr int operator()( int x1, int x2 ) &
+    {
+        return 100*x1 + 10*x2 + 1;
+    }
+
+    constexpr int operator()( int x1, int x2 ) const &
+    {
+        return 100*x1 + 10*x2 + 2;
+    }
+    constexpr int operator()( int x1, int x2 ) &&
+    {
+        return 100*x1 + 10*x2 + 3;
+    }
+    constexpr int operator()( int x1, int x2 ) const &&
+    {
+        return 100*x1 + 10*x2 + 4;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( F1() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )( 2 ), 21 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )( 2, 3 ), 231 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2 )( 3 ), 312 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( F2(), 9 )( 8 ), 893 );
+    }
+
+    {
+        constexpr auto fn = boost::compat::bind_back( F2(), 9 );
+        BOOST_TEST_EQ( fn( 8 ), 892 );
+    }
+
+    {
+        constexpr auto fn = boost::compat::bind_back( F2(), 9 );
+        BOOST_TEST_EQ( std::move( fn )( 8 ), 894 );
+    }
+}
+
+#endif

test/bind_back_obj_test.cpp

@@ -0,0 +1,101 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_back.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+struct F1
+{
+    int operator()()
+    {
+        return -1;
+    }
+
+    int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct F2
+{
+    int operator()( int x1, int x2 ) &
+    {
+        return 100*x1 + 10*x2 + 1;
+    }
+
+    int operator()( int x1, int x2 ) const &
+    {
+        return 100*x1 + 10*x2 + 2;
+    }
+    int operator()( int x1, int x2 ) &&
+    {
+        return 100*x1 + 10*x2 + 3;
+    }
+    int operator()( int x1, int x2 ) const &&
+    {
+        return 100*x1 + 10*x2 + 4;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( F1() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )( 2 ), 21 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )( 2, 3 ), 231 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2 )( 3 ), 312 );
+
+        BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_back( F2(), 9 )( 8 ), 893 );
+    }
+
+    {
+        auto fn = boost::compat::bind_back( F2(), 9 );
+        BOOST_TEST_EQ( fn( 8 ), 891 );
+    }
+
+    {
+        auto const fn = boost::compat::bind_back( F2(), 9 );
+        BOOST_TEST_EQ( fn( 8 ), 892 );
+    }
+
+    {
+        auto fn = boost::compat::bind_back( F2(), 9 );
+        BOOST_TEST_EQ( std::move( fn )( 8 ), 893 );
+    }
+
+#if !BOOST_WORKAROUND(BOOST_GCC, < 40900)
+
+    {
+        auto const fn = boost::compat::bind_back( F2(), 9 );
+        BOOST_TEST_EQ( std::move( fn )( 8 ), 894 );
+    }
+
+#endif
+
+    return boost::report_errors();
+}

test/bind_front_fn_constexpr_test.cpp

@@ -0,0 +1,60 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+constexpr int f0()
+{
+    return -1;
+}
+
+constexpr int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+constexpr int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+constexpr int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( boost::compat::bind_front( f0 )(), -1 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f1 )( 1 ), 1 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f2 )( 1, 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f3 )( 1, 2, 3 ), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_front( f1, 1 )(), 1 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f2, 1 )( 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f3, 1 )( 2, 3 ), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_front( f2, 1, 2 )(), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f3, 1, 2 )( 3 ), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_front( f3, 1, 2, 3 )(), 123 );
+}
+
+#endif

test/bind_front_fn_test.cpp

@@ -0,0 +1,57 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <memory>
+
+int f0()
+{
+    return -1;
+}
+
+int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int g( std::unique_ptr<int> p, std::unique_ptr<int> q )
+{
+    return 10 * *p + *q;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( boost::compat::bind_front( f0 )(), -1 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f1 )( 1 ), 1 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f2 )( 1, 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f3 )( 1, 2, 3 ), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_front( f1, 1 )(), 1 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f2, 1 )( 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f3, 1 )( 2, 3 ), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_front( f2, 1, 2 )(), 12 );
+    BOOST_TEST_EQ( boost::compat::bind_front( f3, 1, 2 )( 3 ), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_front( f3, 1, 2, 3 )(), 123 );
+
+    BOOST_TEST_EQ( boost::compat::bind_front( g, std::unique_ptr<int>( new int(1) ) )( std::unique_ptr<int>( new int(2) ) ), 12 );
+
+    return boost::report_errors();
+}

test/bind_front_md_constexpr_test.cpp

@@ -0,0 +1,58 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, X() )(), -1 );
+    }
+
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, &x )(), -1 );
+    }
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, >= 1920 && BOOST_MSVC < 1940)
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, Y() )(), -1 );
+    }
+
+    {
+        constexpr Y y = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, y )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, &y )(), -1 );
+    }
+
+#endif
+}
+
+#endif

test/bind_front_md_test.cpp

@@ -0,0 +1,101 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, X() )(), -1 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, Y() )(), -1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, x )(), -1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, &x )(), -1 );
+        boost::compat::bind_front( &X::m, &x )() = +1;
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, &x )(), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, std::ref(x) )(), -1 );
+        boost::compat::bind_front( &X::m, std::ref(x) )() = +1;
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, std::ref(x) )(), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, std::cref(x) )(), -1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, y )(), -1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, &y )(), -1 );
+        boost::compat::bind_front( &X::m, &y )() = +1;
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, &y )(), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, std::ref(y) )(), -1 );
+        boost::compat::bind_front( &X::m, std::ref(y) )() = +1;
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, std::ref(y) )(), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, std::cref(y) )(), -1 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, &x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, std::ref(x) )(), -1 );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, y )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, &y )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::m, std::ref(y) )(), -1 );
+    }
+
+    return boost::report_errors();
+}

test/bind_front_mfn_constexpr_test.cpp

@@ -0,0 +1,167 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct X
+{
+    constexpr int f0()
+    {
+        return -1;
+    }
+
+    constexpr int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    constexpr int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0 )( X() ), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1 )( X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( X(), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, X() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, X() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, X() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, X() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, X(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, X(), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, X(), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, X(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, X(), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, X(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, Y() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, Y() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, Y() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, Y() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, Y() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, Y() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, Y(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, Y(), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y(), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, Y(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y(), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        constexpr Y x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        constexpr Y x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2, 3 )(), 123 );
+    }
+}
+
+#endif

test/bind_front_mfn_test.cpp

@@ -0,0 +1,378 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+#include <memory>
+
+struct X
+{
+    int f0()
+    {
+        return -1;
+    }
+
+    int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0 )( X() ), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1 )( X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( X(), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, X() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, X() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, X() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, X() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, X(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, X(), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, X(), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, X(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, X(), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, X(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, Y() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, Y() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, Y() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, Y() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, Y() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, Y() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, Y(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, Y(), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y(), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, Y(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y(), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, Y(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0 )( x ), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1 )( x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, x )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, x, 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0 )( &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1 )( &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, &x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, &x )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, &x, 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0 )( std::ref(x) ), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1 )( std::ref(x), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, std::ref(x) )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, std::ref(x) )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x) )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x) )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, std::ref(x), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( std::cref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( std::cref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::cref(x) )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::cref(x) )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::cref(x), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::cref(x), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::cref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::cref(x), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::cref(x), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        Y x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0 )( x ), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1 )( x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, x )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, x, 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        Y x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0 )( &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1 )( &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, &x )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, &x )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, &x, 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        Y x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0 )( std::ref(x) ), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1 )( std::ref(x), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f0, std::ref(x) )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, std::ref(x) )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x) )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x) )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f1, std::ref(x), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        Y x;
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( std::cref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( std::cref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::cref(x) )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::cref(x) )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::cref(x), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::cref(x), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::cref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::cref(x), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::cref(x), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x) )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x) )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        Y const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        Y const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, &x, 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, &x, 1, 2, 3 )(), 123 );
+    }
+
+    {
+        Y const x = {};
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x) )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x) )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f2, std::ref(x), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::ref(x), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        std::unique_ptr<X> px( new X );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::move(px), 1 )( 2, 3 ), 123 );
+    }
+
+    {
+        std::unique_ptr<Y> px( new Y );
+        BOOST_TEST_EQ( boost::compat::bind_front( &X::f3, std::move(px), 1 )( 2, 3 ), 123 );
+    }
+
+    return boost::report_errors();
+}

test/bind_front_obj_constexpr_test.cpp

@@ -0,0 +1,96 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
+int main() {}
+
+#else
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct F1
+{
+    constexpr int operator()()
+    {
+        return -1;
+    }
+
+    constexpr int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    constexpr int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct F2
+{
+    constexpr int operator()( int x1, int x2 ) &
+    {
+        return 100*x1 + 10*x2 + 1;
+    }
+
+    constexpr int operator()( int x1, int x2 ) const &
+    {
+        return 100*x1 + 10*x2 + 2;
+    }
+    constexpr int operator()( int x1, int x2 ) &&
+    {
+        return 100*x1 + 10*x2 + 3;
+    }
+    constexpr int operator()( int x1, int x2 ) const &&
+    {
+        return 100*x1 + 10*x2 + 4;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( F2(), 9 )( 8 ), 983 );
+    }
+
+    {
+        constexpr auto fn = boost::compat::bind_front( F2(), 9 );
+        BOOST_TEST_EQ( fn( 8 ), 982 );
+    }
+
+    {
+        constexpr auto fn = boost::compat::bind_front( F2(), 9 );
+        BOOST_TEST_EQ( std::move( fn )( 8 ), 984 );
+    }
+}
+
+#endif

test/bind_front_obj_test.cpp

@@ -0,0 +1,101 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/bind_front.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+struct F1
+{
+    int operator()()
+    {
+        return -1;
+    }
+
+    int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct F2
+{
+    int operator()( int x1, int x2 ) &
+    {
+        return 100*x1 + 10*x2 + 1;
+    }
+
+    int operator()( int x1, int x2 ) const &
+    {
+        return 100*x1 + 10*x2 + 2;
+    }
+    int operator()( int x1, int x2 ) &&
+    {
+        return 100*x1 + 10*x2 + 3;
+    }
+    int operator()( int x1, int x2 ) const &&
+    {
+        return 100*x1 + 10*x2 + 4;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )(), -1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1() )( 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )(), 1 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )( 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1 )( 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2 )(), 12 );
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2 )( 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::bind_front( F1(), 1, 2, 3 )(), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::bind_front( F2(), 9 )( 8 ), 983 );
+    }
+
+    {
+        auto fn = boost::compat::bind_front( F2(), 9 );
+        BOOST_TEST_EQ( fn( 8 ), 981 );
+    }
+
+    {
+        auto const fn = boost::compat::bind_front( F2(), 9 );
+        BOOST_TEST_EQ( fn( 8 ), 982 );
+    }
+
+    {
+        auto fn = boost::compat::bind_front( F2(), 9 );
+        BOOST_TEST_EQ( std::move( fn )( 8 ), 983 );
+    }
+
+#if !BOOST_WORKAROUND(BOOST_GCC, < 40900)
+
+    {
+        auto const fn = boost::compat::bind_front( F2(), 9 );
+        BOOST_TEST_EQ( std::move( fn )( 8 ), 984 );
+    }
+
+#endif
+
+    return boost::report_errors();
+}

test/integer_sequence_test.cpp

@@ -0,0 +1,55 @@
+// Copyright 2015 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/integer_sequence.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
+#include <cstddef>
+
+int main()
+{
+    using boost::compat::integer_sequence;
+    using boost::compat::make_integer_sequence;
+    using boost::compat::index_sequence;
+    using boost::compat::make_index_sequence;
+    using boost::compat::index_sequence_for;
+
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<int, 0>, integer_sequence<int>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<int, 1>, integer_sequence<int, 0>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<int, 2>, integer_sequence<int, 0, 1>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<int, 3>, integer_sequence<int, 0, 1, 2>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<int, 4>, integer_sequence<int, 0, 1, 2, 3>);
+
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<char, 0>, integer_sequence<char>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<char, 1>, integer_sequence<char, 0>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<char, 2>, integer_sequence<char, 0, 1>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<char, 3>, integer_sequence<char, 0, 1, 2>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<char, 4>, integer_sequence<char, 0, 1, 2, 3>);
+
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<std::size_t, 0>, integer_sequence<std::size_t>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<std::size_t, 1>, integer_sequence<std::size_t, 0>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<std::size_t, 2>, integer_sequence<std::size_t, 0, 1>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<std::size_t, 3>, integer_sequence<std::size_t, 0, 1, 2>);
+    BOOST_TEST_TRAIT_SAME(make_integer_sequence<std::size_t, 4>, integer_sequence<std::size_t, 0, 1, 2, 3>);
+
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<0>, integer_sequence<std::size_t>);
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<1>, integer_sequence<std::size_t, 0>);
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<2>, integer_sequence<std::size_t, 0, 1>);
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<3>, integer_sequence<std::size_t, 0, 1, 2>);
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<4>, integer_sequence<std::size_t, 0, 1, 2, 3>);
+
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<0>, index_sequence<>);
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<1>, index_sequence<0>);
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<2>, index_sequence<0, 1>);
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<3>, index_sequence<0, 1, 2>);
+    BOOST_TEST_TRAIT_SAME(make_index_sequence<4>, index_sequence<0, 1, 2, 3>);
+
+    BOOST_TEST_TRAIT_SAME(index_sequence_for<>, index_sequence<>);
+    BOOST_TEST_TRAIT_SAME(index_sequence_for<void>, index_sequence<0>);
+    BOOST_TEST_TRAIT_SAME(index_sequence_for<void, void>, index_sequence<0, 1>);
+    BOOST_TEST_TRAIT_SAME(index_sequence_for<void, void, void>, index_sequence<0, 1, 2>);
+    BOOST_TEST_TRAIT_SAME(index_sequence_for<void, void, void, void>, index_sequence<0, 1, 2, 3>);
+
+    return boost::report_errors();
+}

test/invoke_fn_constexpr_test.cpp

@@ -0,0 +1,40 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/invoke.hpp>
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+constexpr int f0()
+{
+    return -1;
+}
+
+constexpr int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+constexpr int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+constexpr int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( boost::compat::invoke( f0 ), -1 );
+    BOOST_TEST_EQ( boost::compat::invoke( f1, 1 ), 1 );
+    BOOST_TEST_EQ( boost::compat::invoke( f2, 1, 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::invoke( f3, 1, 2, 3 ), 123 );
+}

test/invoke_fn_noexcept_test.cpp

@@ -0,0 +1,47 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config/pragma_message.hpp>
+
+#if !defined(__cpp_noexcept_function_type)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped, __cpp_noexcept_function_type is not defined" )
+int main() {}
+
+#else
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int f0()
+{
+    return -1;
+}
+
+int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke( f0 ) ), false );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke( f1, 1 ) ), true );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke( f2, 1, 2 ) ), false );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke( f3, 1, 2, 3 ) ), true );
+
+    return boost::report_errors();
+}
+
+#endif

test/invoke_fn_test.cpp

@@ -0,0 +1,40 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int f0()
+{
+    return -1;
+}
+
+int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( boost::compat::invoke( f0 ), -1 );
+    BOOST_TEST_EQ( boost::compat::invoke( f1, 1 ), 1 );
+    BOOST_TEST_EQ( boost::compat::invoke( f2, 1, 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::invoke( f3, 1, 2, 3 ), 123 );
+
+    return boost::report_errors();
+}

test/invoke_md_constexpr_test.cpp

@@ -0,0 +1,42 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, X() ), -1 );
+
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, &x ), -1 );
+    }
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, >= 1920 && BOOST_MSVC < 1940)
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, Y() ), -1 );
+
+        constexpr Y y = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, &y ), -1 );
+    }
+#endif
+}

test/invoke_md_noexcept_test.cpp

@@ -0,0 +1,60 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, X() ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, Y() ) ), true );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, &x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, std::ref(x) ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, std::cref(x) ) ), true );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, &y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, std::ref(y) ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, std::cref(y) ) ), true );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, &x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, std::ref(x) ) ), true );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, &y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::m, std::ref(y) ) ), true );
+    }
+
+    return boost::report_errors();
+}

test/invoke_md_test.cpp

@@ -0,0 +1,105 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, X() ), -1 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, Y() ), -1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, x ), -1 );
+        boost::compat::invoke( &X::m, x ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, x ), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, &x ), -1 );
+        boost::compat::invoke( &X::m, &x ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, &x ), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, std::ref(x) ), -1 );
+        boost::compat::invoke( &X::m, std::ref(x) ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, std::ref(x) ), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, std::cref(x) ), -1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, y ), -1 );
+        boost::compat::invoke( &X::m, y ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, y ), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, &y ), -1 );
+        boost::compat::invoke( &X::m, &y ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, &y ), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, std::ref(y) ), -1 );
+        boost::compat::invoke( &X::m, std::ref(y) ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, std::ref(y) ), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, std::cref(y) ), -1 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, std::ref(x) ), -1 );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, &y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::m, std::ref(y) ), -1 );
+    }
+
+    return boost::report_errors();
+}

test/invoke_mfn_constexpr_test.cpp

@@ -0,0 +1,88 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/invoke.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct X
+{
+    constexpr int f0() const
+    {
+        return -1;
+    }
+
+    constexpr int f1( int x1 ) const noexcept
+    {
+        return x1;
+    }
+
+    constexpr int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, X() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, X(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, Y() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, Y(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, Y(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, Y(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, &x, 1, 2, 3 ), 123 );
+    }
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+    {
+        constexpr Y y = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, &y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, &y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, &y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, &y, 1, 2, 3 ), 123 );
+    }
+#endif
+}

test/invoke_mfn_noexcept_test.cpp

@@ -0,0 +1,134 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config/pragma_message.hpp>
+
+#if !defined(__cpp_noexcept_function_type)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped, __cpp_noexcept_function_type is not defined" )
+int main() {}
+
+#else
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int f0()
+    {
+        return -1;
+    }
+
+    int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f0, X() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f1, X(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, X(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, X(), 1, 2, 3 ) ), true );
+    }
+
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f0, Y() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f1, Y(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, Y(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, Y(), 1, 2, 3 ) ), true );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f0, x ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f1, x, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f0, &x ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f1, &x, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, &x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, &x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f0, std::ref(x) ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f1, std::ref(x), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, std::ref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, std::ref(x), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, std::cref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, std::cref(x), 1, 2, 3 ) ), true );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f0, y ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f1, y, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f0, &y ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f1, &y, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, &y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, &y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f0, std::ref(y) ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f1, std::ref(y), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, std::ref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, std::ref(y), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, std::cref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, std::cref(y), 1, 2, 3 ) ), true );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, &x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, &x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, std::ref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, std::ref(x), 1, 2, 3 ) ), true );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, &y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, &y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f2, std::ref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( &X::f3, std::ref(y), 1, 2, 3 ) ), true );
+    }
+
+    return boost::report_errors();
+}
+
+#endif

test/invoke_mfn_test.cpp

@@ -0,0 +1,127 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int f0()
+    {
+        return -1;
+    }
+
+    int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, X() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, X(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, Y() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, Y(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, Y(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, Y(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, std::ref(x) ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, std::ref(x), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, std::cref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, std::cref(x), 1, 2, 3 ), 123 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, &y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, &y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, &y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, &y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f0, std::ref(y) ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f1, std::ref(y), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, std::ref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, std::ref(y), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, std::cref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, std::cref(y), 1, 2, 3 ), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, std::ref(x), 1, 2, 3 ), 123 );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, &y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, &y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f2, std::ref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( &X::f3, std::ref(y), 1, 2, 3 ), 123 );
+    }
+
+    return boost::report_errors();
+}

test/invoke_obj_constexpr_test.cpp

@@ -0,0 +1,50 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct F
+{
+    constexpr int operator()() const
+    {
+        return -1;
+    }
+
+    constexpr int operator()( int x1 ) const noexcept
+    {
+        return x1;
+    }
+
+    constexpr int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( F() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( F(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( F(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( F(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        constexpr F f = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( f ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( f, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( f, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( f, 1, 2, 3 ), 123 );
+    }
+}

test/invoke_obj_noexcept_test.cpp

@@ -0,0 +1,57 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct F
+{
+    int operator()()
+    {
+        return -1;
+    }
+
+    int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( F() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( F(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( F(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( F(), 1, 2, 3 ) ), true );
+    }
+
+    {
+        F f = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( f ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( f, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( f, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( f, 1, 2, 3 ) ), true );
+    }
+
+    {
+        F const f = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( f, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke( f, 1, 2, 3 ) ), true );
+    }
+
+    return boost::report_errors();
+}

test/invoke_obj_test.cpp

@@ -0,0 +1,57 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct F
+{
+    int operator()()
+    {
+        return -1;
+    }
+
+    int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke( F() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( F(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( F(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( F(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        F f;
+
+        BOOST_TEST_EQ( boost::compat::invoke( f ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke( f, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke( f, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( f, 1, 2, 3 ), 123 );
+    }
+
+    {
+        F const f = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke( f, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke( f, 1, 2, 3 ), 123 );
+    }
+
+    return boost::report_errors();
+}

test/invoke_r_fn_constexpr_test.cpp

@@ -0,0 +1,50 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/invoke.hpp>
+#include <boost/config.hpp>
+
+#define STATIC_ASSERT(...) static_assert((__VA_ARGS__), #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+constexpr int f0()
+{
+    return -1;
+}
+
+constexpr int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+constexpr int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+constexpr int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( boost::compat::invoke_r<long>( f0 ), -1 );
+    BOOST_TEST_EQ( boost::compat::invoke_r<long>( f1, 1 ), 1 );
+    BOOST_TEST_EQ( boost::compat::invoke_r<long>( f2, 1, 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::invoke_r<long>( f3, 1, 2, 3 ), 123 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+    STATIC_ASSERT( boost::compat::invoke_r<void>( f0 ), true );
+    STATIC_ASSERT( boost::compat::invoke_r<void>( f1, 1 ), true );
+    STATIC_ASSERT( boost::compat::invoke_r<void>( f2, 1, 2 ), true );
+    STATIC_ASSERT( boost::compat::invoke_r<void>( f3, 1, 2, 3 ), true );
+
+#endif
+}

test/invoke_r_fn_noexcept_test.cpp

@@ -0,0 +1,52 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config/pragma_message.hpp>
+
+#if !defined(__cpp_noexcept_function_type)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped, __cpp_noexcept_function_type is not defined" )
+int main() {}
+
+#else
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int f0()
+{
+    return -1;
+}
+
+int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f0 ) ), false );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f1, 1 ) ), true );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f2, 1, 2 ) ), false );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f3, 1, 2, 3 ) ), true );
+
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f0 ) ), false );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f1, 1 ) ), true );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f2, 1, 2 ) ), false );
+    BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f3, 1, 2, 3 ) ), true );
+
+    return boost::report_errors();
+}
+
+#endif

test/invoke_r_fn_test.cpp

@@ -0,0 +1,45 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int f0()
+{
+    return -1;
+}
+
+int f1( int x1 ) noexcept
+{
+    return x1;
+}
+
+int f2( int x1, int x2 )
+{
+    return 10*x1+x2;
+}
+
+int f3( int x1, int x2, int x3 ) noexcept
+{
+    return 100*x1 + 10*x2 + x3;
+}
+
+int main()
+{
+    BOOST_TEST_EQ( boost::compat::invoke_r<long>( f0 ), -1 );
+    BOOST_TEST_EQ( boost::compat::invoke_r<long>( f1, 1 ), 1 );
+    BOOST_TEST_EQ( boost::compat::invoke_r<long>( f2, 1, 2 ), 12 );
+    BOOST_TEST_EQ( boost::compat::invoke_r<long>( f3, 1, 2, 3 ), 123 );
+
+    boost::compat::invoke_r<void>( f0 );
+    boost::compat::invoke_r<void>( f1, 1 );
+    boost::compat::invoke_r<void>( f2, 1, 2 );
+    boost::compat::invoke_r<void>( f3, 1, 2, 3 );
+
+    return boost::report_errors();
+}

test/invoke_r_md_constexpr_test.cpp

@@ -0,0 +1,56 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+#define STATIC_ASSERT(...) static_assert((__VA_ARGS__), #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public X
+{
+};
+
+int main()
+{
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, X() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, &x ), -1 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::m, X() ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::m, x ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::m, &x ), true );
+
+#endif
+    }
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, >= 1920 && BOOST_MSVC < 1940)
+    {
+        constexpr Y y = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, Y() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, &y ), -1 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::m, Y() ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::m, y ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::m, &y ), true );
+
+#endif
+    }
+#endif
+}

test/invoke_r_md_noexcept_test.cpp

@@ -0,0 +1,99 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, X() ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, Y() ) ), true );
+    }
+
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, X() ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, Y() ) ), true );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, &x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, std::ref(x) ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, std::cref(x) ) ), true );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, &x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, std::ref(x) ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, std::cref(x) ) ), true );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, &y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, std::ref(y) ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, std::cref(y) ) ), true );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, &y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, std::ref(y) ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, std::cref(y) ) ), true );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, &x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, std::ref(x) ) ), true );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, &x ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, std::ref(x) ) ), true );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, &y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::m, std::ref(y) ) ), true );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, &y ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::m, std::ref(y) ) ), true );
+    }
+
+    return boost::report_errors();
+}

test/invoke_r_md_test.cpp

@@ -0,0 +1,131 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, X() ), -1 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, Y() ), -1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, x ), -1 );
+        boost::compat::invoke_r<int&>( &X::m, x ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, x ), +1 );
+        boost::compat::invoke_r<void>( &X::m, x );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, &x ), -1 );
+        boost::compat::invoke_r<int&>( &X::m, &x ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, &x ), +1 );
+        boost::compat::invoke_r<void>( &X::m, &x );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, std::ref(x) ), -1 );
+        boost::compat::invoke_r<int&>( &X::m, std::ref(x) ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, std::ref(x) ), +1 );
+        boost::compat::invoke_r<void>( &X::m, std::ref(x) );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, std::cref(x) ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, std::cref(x) ), -1 );
+        boost::compat::invoke_r<void>( &X::m, std::cref(x) );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, y ), -1 );
+        boost::compat::invoke_r<int&>( &X::m, y ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, y ), +1 );
+        boost::compat::invoke_r<void>( &X::m, y );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, &y ), -1 );
+        boost::compat::invoke_r<int&>( &X::m, &y ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, &y ), +1 );
+        boost::compat::invoke_r<void>( &X::m, &y );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, std::ref(y) ), -1 );
+        boost::compat::invoke_r<int&>( &X::m, std::ref(y) ) = +1;
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, std::ref(y) ), +1 );
+        boost::compat::invoke_r<void>( &X::m, std::ref(y) );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, std::cref(y) ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, std::cref(y) ), -1 );
+        boost::compat::invoke_r<void>( &X::m, std::cref(y) );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, x ), -1 );
+        boost::compat::invoke_r<void>( &X::m, x );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, &x ), -1 );
+        boost::compat::invoke_r<void>( &X::m, &x );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, std::ref(x) ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, std::ref(x) ), -1 );
+        boost::compat::invoke_r<void>( &X::m, std::ref(x) );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, y ), -1 );
+        boost::compat::invoke_r<void>( &X::m, y );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, &y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, &y ), -1 );
+        boost::compat::invoke_r<void>( &X::m, &y );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<int const&>( &X::m, std::ref(y) ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::m, std::ref(y) ), -1 );
+        boost::compat::invoke_r<void>( &X::m, std::ref(y) );
+    }
+
+    return boost::report_errors();
+}

test/invoke_r_mfn_constexpr_test.cpp

@@ -0,0 +1,134 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/invoke.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+#define STATIC_ASSERT(...) static_assert((__VA_ARGS__), #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct X
+{
+    constexpr int f0() const
+    {
+        return -1;
+    }
+
+    constexpr int f1( int x1 ) const noexcept
+    {
+        return x1;
+    }
+
+    constexpr int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, X() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, X(), 1, 2, 3 ), 123 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f0, X() ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f1, X(), 1 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f2, X(), 1, 2 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f3, X(), 1, 2, 3 ), true );
+
+#endif
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, Y() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, Y(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, Y(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, Y(), 1, 2, 3 ), 123 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f0, Y() ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f1, Y(), 1 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f2, Y(), 1, 2 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f3, Y(), 1, 2, 3 ), true );
+
+#endif
+    }
+
+    {
+        constexpr X x = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, &x, 1, 2, 3 ), 123 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f0, x ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f1, x, 1 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f2, x, 1, 2 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f3, x, 1, 2, 3 ), true );
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f0, &x ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f1, &x, 1 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f2, &x, 1, 2 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f3, &x, 1, 2, 3 ), true );
+
+#endif
+    }
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+    {
+        constexpr Y y = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, &y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, &y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, &y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, &y, 1, 2, 3 ), 123 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f0, y ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f1, y, 1 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f2, y, 1, 2 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f3, y, 1, 2, 3 ), true );
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f0, &y ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f1, &y, 1 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f2, &y, 1, 2 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( &X::f3, &y, 1, 2, 3 ), true );
+
+#endif
+    }
+#endif
+}

test/invoke_r_mfn_noexcept_test.cpp

@@ -0,0 +1,214 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config/pragma_message.hpp>
+
+#if !defined(__cpp_noexcept_function_type)
+
+BOOST_PRAGMA_MESSAGE( "Test skipped, __cpp_noexcept_function_type is not defined" )
+int main() {}
+
+#else
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int f0()
+    {
+        return -1;
+    }
+
+    int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f0, X() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f1, X(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, X(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, X(), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f0, X() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f1, X(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, X(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, X(), 1, 2, 3 ) ), true );
+    }
+
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f0, Y() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f1, Y(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, Y(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, Y(), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f0, Y() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f1, Y(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, Y(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, Y(), 1, 2, 3 ) ), true );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f0, x ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f1, x, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f0, &x ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f1, &x, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, &x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, &x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f0, std::ref(x) ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f1, std::ref(x), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, std::ref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, std::ref(x), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, std::cref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, std::cref(x), 1, 2, 3 ) ), true );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f0, x ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f1, x, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f0, &x ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f1, &x, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, &x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, &x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f0, std::ref(x) ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f1, std::ref(x), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, std::ref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, std::ref(x), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, std::cref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, std::cref(x), 1, 2, 3 ) ), true );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f0, y ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f1, y, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f0, &y ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f1, &y, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, &y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, &y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f0, std::ref(y) ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f1, std::ref(y), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, std::ref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, std::ref(y), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, std::cref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, std::cref(y), 1, 2, 3 ) ), true );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f0, y ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f1, y, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f0, &y ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f1, &y, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, &y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, &y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f0, std::ref(y) ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f1, std::ref(y), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, std::ref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, std::ref(y), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, std::cref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, std::cref(y), 1, 2, 3 ) ), true );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, &x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, &x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, std::ref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, std::ref(x), 1, 2, 3 ) ), true );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, &x, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, &x, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, std::ref(x), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, std::ref(x), 1, 2, 3 ) ), true );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, &y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, &y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f2, std::ref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( &X::f3, std::ref(y), 1, 2, 3 ) ), true );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, &y, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, &y, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f2, std::ref(y), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( &X::f3, std::ref(y), 1, 2, 3 ) ), true );
+    }
+
+    return boost::report_errors();
+}
+
+#endif

test/invoke_r_mfn_test.cpp

@@ -0,0 +1,211 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int f0()
+    {
+        return -1;
+    }
+
+    int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, X() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, X(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, Y() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, Y(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, Y(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, Y(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, std::ref(x) ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, std::ref(x), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, std::cref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, std::cref(x), 1, 2, 3 ), 123 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, &y ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, &y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, &y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, &y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f0, std::ref(y) ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f1, std::ref(y), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, std::ref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, std::ref(y), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, std::cref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, std::cref(y), 1, 2, 3 ), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, std::ref(x), 1, 2, 3 ), 123 );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, &y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, &y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f2, std::ref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( &X::f3, std::ref(y), 1, 2, 3 ), 123 );
+    }
+
+    {
+        boost::compat::invoke_r<void>( &X::f0, X() );
+        boost::compat::invoke_r<void>( &X::f1, X(), 1 );
+        boost::compat::invoke_r<void>( &X::f2, X(), 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, X(), 1, 2, 3 );
+    }
+
+    {
+        boost::compat::invoke_r<void>( &X::f0, Y() );
+        boost::compat::invoke_r<void>( &X::f1, Y(), 1 );
+        boost::compat::invoke_r<void>( &X::f2, Y(), 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, Y(), 1, 2, 3 );
+    }
+
+    {
+        X x;
+
+        boost::compat::invoke_r<void>( &X::f0, x );
+        boost::compat::invoke_r<void>( &X::f1, x, 1 );
+        boost::compat::invoke_r<void>( &X::f2, x, 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, x, 1, 2, 3 );
+
+        boost::compat::invoke_r<void>( &X::f0, &x );
+        boost::compat::invoke_r<void>( &X::f1, &x, 1 );
+        boost::compat::invoke_r<void>( &X::f2, &x, 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, &x, 1, 2, 3 );
+
+        boost::compat::invoke_r<void>( &X::f0, std::ref(x) );
+        boost::compat::invoke_r<void>( &X::f1, std::ref(x), 1 );
+        boost::compat::invoke_r<void>( &X::f2, std::ref(x), 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, std::ref(x), 1, 2, 3 );
+
+        boost::compat::invoke_r<void>( &X::f2, std::cref(x), 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, std::cref(x), 1, 2, 3 );
+    }
+
+    {
+        Y y;
+
+        boost::compat::invoke_r<void>( &X::f0, y );
+        boost::compat::invoke_r<void>( &X::f1, y, 1 );
+        boost::compat::invoke_r<void>( &X::f2, y, 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, y, 1, 2, 3 );
+
+        boost::compat::invoke_r<void>( &X::f0, &y );
+        boost::compat::invoke_r<void>( &X::f1, &y, 1 );
+        boost::compat::invoke_r<void>( &X::f2, &y, 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, &y, 1, 2, 3 );
+
+        boost::compat::invoke_r<void>( &X::f0, std::ref(y) );
+        boost::compat::invoke_r<void>( &X::f1, std::ref(y), 1 );
+        boost::compat::invoke_r<void>( &X::f2, std::ref(y), 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, std::ref(y), 1, 2, 3 );
+
+        boost::compat::invoke_r<void>( &X::f2, std::cref(y), 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, std::cref(y), 1, 2, 3 );
+    }
+
+    {
+        X const x = {};
+
+        boost::compat::invoke_r<void>( &X::f2, x, 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, x, 1, 2, 3 );
+
+        boost::compat::invoke_r<void>( &X::f2, &x, 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, &x, 1, 2, 3 );
+
+        boost::compat::invoke_r<void>( &X::f2, std::ref(x), 1, 2 );
+        boost::compat::invoke_r<void>( &X::f3, std::ref(x), 1, 2, 3 );
+    }
+
+    {
+        Y const y = {};
+
+        boost::compat::invoke_r<long>( &X::f2, y, 1, 2 );
+        boost::compat::invoke_r<long>( &X::f3, y, 1, 2, 3 );
+
+        boost::compat::invoke_r<long>( &X::f2, &y, 1, 2 );
+        boost::compat::invoke_r<long>( &X::f3, &y, 1, 2, 3 );
+
+        boost::compat::invoke_r<long>( &X::f2, std::ref(y), 1, 2 );
+        boost::compat::invoke_r<long>( &X::f3, std::ref(y), 1, 2, 3 );
+    }
+
+    return boost::report_errors();
+}

test/invoke_r_obj_constexpr_test.cpp

@@ -0,0 +1,68 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+
+#define STATIC_ASSERT(...) static_assert((__VA_ARGS__), #__VA_ARGS__)
+#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
+
+struct F
+{
+    constexpr int operator()() const
+    {
+        return -1;
+    }
+
+    constexpr int operator()( int x1 ) const noexcept
+    {
+        return x1;
+    }
+
+    constexpr int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    constexpr int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( F() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( F(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( F(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( F(), 1, 2, 3 ), 123 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( F() ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( F(), 1 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( F(), 1, 2 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( F(), 1, 2, 3 ), true );
+
+#endif
+    }
+
+    {
+        constexpr F f = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f, 1, 2, 3 ), 123 );
+
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+
+        STATIC_ASSERT( boost::compat::invoke_r<void>( f ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( f, 1 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( f, 1, 2 ), true );
+        STATIC_ASSERT( boost::compat::invoke_r<void>( f, 1, 2, 3 ), true );
+
+#endif
+    }
+}

test/invoke_r_obj_noexcept_test.cpp

@@ -0,0 +1,70 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct F
+{
+    int operator()()
+    {
+        return -1;
+    }
+
+    int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( F() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( F(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( F(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( F(), 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( F() ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( F(), 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( F(), 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( F(), 1, 2, 3 ) ), true );
+    }
+
+    {
+        F f = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f, 1 ) ), true );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f, 1, 2, 3 ) ), true );
+    }
+
+    {
+        F const f = {};
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<long>( f, 1, 2, 3 ) ), true );
+
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f, 1, 2 ) ), false );
+        BOOST_TEST_EQ( noexcept( boost::compat::invoke_r<void>( f, 1, 2, 3 ) ), true );
+    }
+
+    return boost::report_errors();
+}

test/invoke_r_obj_test.cpp

@@ -0,0 +1,80 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct F
+{
+    int operator()()
+    {
+        return -1;
+    }
+
+    int operator()( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int operator()( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( F() ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( F(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( F(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( F(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        F f;
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f ), -1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f, 1, 2, 3 ), 123 );
+    }
+
+    {
+        F const f = {};
+
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::invoke_r<long>( f, 1, 2, 3 ), 123 );
+    }
+
+    {
+        boost::compat::invoke_r<void>( F() );
+        boost::compat::invoke_r<void>( F(), 1 );
+        boost::compat::invoke_r<void>( F(), 1, 2 );
+        boost::compat::invoke_r<void>( F(), 1, 2, 3 );
+    }
+
+    {
+        F f;
+
+        boost::compat::invoke_r<void>( f );
+        boost::compat::invoke_r<void>( f, 1 );
+        boost::compat::invoke_r<void>( f, 1, 2 );
+        boost::compat::invoke_r<void>( f, 1, 2, 3 );
+    }
+
+    {
+        F const f = {};
+
+        boost::compat::invoke_r<void>( f, 1, 2 );
+        boost::compat::invoke_r<void>( f, 1, 2, 3 );
+    }
+
+    return boost::report_errors();
+}

test/invoke_result_test.cpp

@@ -0,0 +1,107 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <boost/mp11/utility.hpp>
+
+struct F
+{
+    void operator()()
+    {
+    }
+
+    char operator()( char x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    double operator()( float x1, float x2, float x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct X
+{
+};
+
+int main()
+{
+    using boost::compat::invoke_result_t;
+    using boost::mp11::mp_valid;
+
+    // nonfunction
+
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, int, int, int> ));
+
+    // function reference
+
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<void(&)()>, void );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<char(&)(int), char>, char );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int(&)(int, int), int, int>, int );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<double(&)(double, double, double), float, float, float>, double );
+
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, void(&)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, char(&)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, char(&)(int), int, int> ));
+
+    // function pointer
+
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<void(*)()>, void );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<char(*)(int), char>, char );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int(*)(int, int), int, int>, int );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<double(*)(double, double, double), float, float, float>, double );
+
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, void(*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, char(*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, char(*)(int), int, int> ));
+
+    // object
+
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<F>, void );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<F, char>, char );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<F, int, int>, int );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<F, float, float, float>, double );
+
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, F, int, int, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, F const> ));
+
+    // member function pointer
+
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<void(X::*)(), X>, void );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<char(X::*)(int), X, char>, char );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int(X::*)(int, int), X, int, int>, int );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<double(X::*)(double, double, double), X, float, float, float>, double );
+
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, void(X::*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, void(X::*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, void(X::*)(), X, int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, char(X::*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, char(X::*)(int), int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, char(X::*)(int), X> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, char(X::*)(int), X, int, int> ));
+
+    // member data pointer
+
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int X::*, X>, int&& );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int X::*, X const>, int const&& );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int X::*, X&>, int& );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int X::*, X const&>, int const& );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int X::*, X*>, int& );
+    BOOST_TEST_TRAIT_SAME( invoke_result_t<int X::*, X const*>, int const& );
+
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, int X::*> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, int X::*, int> ));
+    BOOST_TEST_TRAIT_FALSE(( mp_valid<invoke_result_t, int X::*, X, int> ));
+
+    return boost::report_errors();
+}

test/is_invocable_r_test.cpp

@@ -0,0 +1,195 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+struct F
+{
+    void operator()()
+    {
+    }
+
+    char operator()( char x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    double operator()( float x1, float x2, float x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct X
+{
+};
+
+int main()
+{
+    using boost::compat::is_invocable_r;
+
+    // nonfunction
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, int, int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, int, int, int> ));
+
+    // function reference
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, void(&)()> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, char(&)(int), char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int(&)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, double(&)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, void(&)()> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, char(&)(int), char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int(&)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, double(&)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, void(&)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, char(&)(int), char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int(&)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, double(&)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, void(&)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, char(&)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, char(&)(int), int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, void(&)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, char(&)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, char(&)(int), int, int> ));
+
+    // function pointer
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, void(*)()> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, char(*)(int), char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int(*)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, double(*)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, void(*)()> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, char(*)(int), char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int(*)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, double(*)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, void(*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, char(*)(int), char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int(*)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, double(*)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, void(*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, char(*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, char(*)(int), int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, void(*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, char(*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, char(*)(int), int, int> ));
+
+    // object
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, F> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, F, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, F, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, F, float, float, float> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, F> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, F, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, F, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, F, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, F> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, F, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, F, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, F, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, F, int, int, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, F const> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, F, int, int, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, F const> ));
+
+    // member function pointer
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, void(X::*)(), X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, char(X::*)(int), X, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int(X::*)(int, int), X, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, double(X::*)(double, double, double), X, float, float, float> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, void(X::*)(), X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, char(X::*)(int), X, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int(X::*)(int, int), X, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, double(X::*)(double, double, double), X, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, void(X::*)(), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, char(X::*)(int), X, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int(X::*)(int, int), X, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, double(X::*)(double, double, double), X, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, void(X::*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, void(X::*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, void(X::*)(), X, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, char(X::*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, char(X::*)(int), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, char(X::*)(int), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, char(X::*)(int), X, int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, void(X::*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, void(X::*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, void(X::*)(), X, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, char(X::*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, char(X::*)(int), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, char(X::*)(int), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, char(X::*)(int), X, int, int> ));
+
+    // member data pointer
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int X::*, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int X::*, X&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int X::*, X*> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<long, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int X::*, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int X::*, X&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int X::*, X*> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<void, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int X::*, X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int X::*, X const> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int X::*, X&> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int X::*, X*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<X, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<int&, int X::*, X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<int&, int X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<int&, int X::*, X&> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<int&, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<int&, int X::*, X*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<int&, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable_r<int&&, int X::*, X> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, int X::*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, int X::*, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<long, int X::*, X, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, int X::*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, int X::*, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable_r<void, int X::*, X, int> ));
+
+    return boost::report_errors();
+}

test/is_invocable_test.cpp

@@ -0,0 +1,105 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+struct F
+{
+    void operator()()
+    {
+    }
+
+    char operator()( char x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    double operator()( float x1, float x2, float x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct X
+{
+};
+
+int main()
+{
+    using boost::compat::is_invocable;
+
+    // nonfunction
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<int, int, int> ));
+
+    // function reference
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<void(&)()> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<char(&)(int), char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int(&)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<double(&)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<void(&)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<char(&)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<char(&)(int), int, int> ));
+
+    // function pointer
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<void(*)()> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<char(*)(int), char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int(*)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<double(*)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<void(*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<char(*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<char(*)(int), int, int> ));
+
+    // object
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<F> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<F, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<F, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<F, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<F, int, int, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<F const> ));
+
+    // member function pointer
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<void(X::*)(), X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<char(X::*)(int), X, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int(X::*)(int, int), X, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<double(X::*)(double, double, double), X, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<void(X::*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<void(X::*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<void(X::*)(), X, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<char(X::*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<char(X::*)(int), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<char(X::*)(int), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<char(X::*)(int), X, int, int> ));
+
+    // member data pointer
+
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int X::*, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int X::*, X&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int X::*, X*> ));
+    BOOST_TEST_TRAIT_TRUE(( is_invocable<int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<int X::*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<int X::*, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_invocable<int X::*, X, int> ));
+
+    return boost::report_errors();
+}

test/is_nothrow_invocable_r_test.cpp

@@ -0,0 +1,288 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+struct F
+{
+    void operator()()
+    {
+    }
+
+    char operator()( char x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    double operator()( float x1, float x2, float x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct X
+{
+};
+
+struct Y
+{
+    Y( int );
+    Y( double ) noexcept;
+};
+
+int main()
+{
+    using boost::compat::is_nothrow_invocable_r;
+
+    // nonfunction
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int, int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int, int, int> ));
+
+    // function reference
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(&)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(&)(int), char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int(&)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, double(&)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, void(&)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(&)(int), char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int(&)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, double(&)(double, double, double), float, float, float> ));
+
+#if defined(__cpp_noexcept_function_type)
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(&)() noexcept> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, char(&)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int(&)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, double(&)(double, double, double) noexcept, float, float, float> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, void(&)() noexcept> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, char(&)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int(&)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, double(&)(double, double, double) noexcept, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, void(&)() noexcept> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, char(&)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int(&)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, double(&)(double, double, double) noexcept, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, void(&)() noexcept> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, char(&)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int(&)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double(&)(double, double, double) noexcept, float, float, float> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(&)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(&)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(&)(int), int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, void(&)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(&)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(&)(int), int, int> ));
+
+    // function pointer
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(*)(int), char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int(*)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, double(*)(double, double, double), float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, void(*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(*)(int), char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int(*)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, double(*)(double, double, double), float, float, float> ));
+
+#if defined(__cpp_noexcept_function_type)
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(*)() noexcept> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, char(*)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int(*)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, double(*)(double, double, double) noexcept, float, float, float> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, void(*)() noexcept> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, char(*)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int(*)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, double(*)(double, double, double) noexcept, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, void(*)() noexcept> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, char(*)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int(*)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, double(*)(double, double, double) noexcept, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, void(*)() noexcept> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, char(*)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int(*)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double(*)(double, double, double) noexcept, float, float, float> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(*)(int), int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, void(*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(*)(int), int, int> ));
+
+    // object
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, F> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, F, int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, F> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, F, int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, F> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, F, int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, F> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, F, int, int> ));
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, F, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, F, float, float, float> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, F, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, F, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, F, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, F, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, F, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, F, float, float, float> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, F, int, int, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, F const> ));
+
+    // member function pointer
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(X::*)(), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(X::*)(int), X, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int(X::*)(int, int), X, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, double(X::*)(double, double, double), X, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, void(X::*)(), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(X::*)(int), X, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int(X::*)(int, int), X, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, double(X::*)(double, double, double), X, float, float, float> ));
+
+#if defined(__cpp_noexcept_function_type)
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(X::*)() noexcept, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, char(X::*)(int) noexcept, X, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int(X::*)(int, int) noexcept, X, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, double(X::*)(double, double, double) noexcept, X, float, float, float> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, void(X::*)() noexcept, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, char(X::*)(int) noexcept, X, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int(X::*)(int, int) noexcept, X, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, double(X::*)(double, double, double) noexcept, X, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, void(X::*)() noexcept, X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, char(X::*)(int) noexcept, X, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int(X::*)(int, int) noexcept, X, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, double(X::*)(double, double, double) noexcept, X, float, float, float> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, void(X::*)() noexcept, X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, char(X::*)(int) noexcept, X, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int(X::*)(int, int) noexcept, X, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double(X::*)(double, double, double) noexcept, X, float, float, float> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(X::*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(X::*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, void(X::*)(), X, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(X::*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(X::*)(int), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(X::*)(int), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, char(X::*)(int), X, int, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, void(X::*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, void(X::*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, void(X::*)(), X, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(X::*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(X::*)(int), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(X::*)(int), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, char(X::*)(int), X, int, int> ));
+
+    // member data pointer
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int X::*, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int X::*, X&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int X::*, X*> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<long, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int X::*, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int X::*, X&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int X::*, X*> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<void, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int X::*, X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int X::*, X const> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int X::*, X&> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int X::*, X*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<X, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int X::*, X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int X::*, X const> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int X::*, X&> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int X::*, X*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<Y, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double X::*, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double X::*, X&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double X::*, X*> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<Y, double X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<int&, int X::*, X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<int&, int X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<int&, int X::*, X&> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<int&, int X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<int&, int X::*, X*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<int&, int X::*, X const*> ));
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable_r<int&&, int X::*, X> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int X::*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int X::*, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<long, int X::*, X, int> ));
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int X::*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int X::*, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable_r<void, int X::*, X, int> ));
+
+    return boost::report_errors();
+}

test/is_nothrow_invocable_test.cpp

@@ -0,0 +1,143 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/invoke.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+
+struct F
+{
+    void operator()()
+    {
+    }
+
+    char operator()( char x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int operator()( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    double operator()( float x1, float x2, float x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct X
+{
+};
+
+int main()
+{
+    using boost::compat::is_nothrow_invocable;
+
+    // nonfunction
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int, int, int> ));
+
+    // function reference
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<void(&)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(&)(int), char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int(&)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<double(&)(double, double, double), float, float, float> ));
+
+#if defined(__cpp_noexcept_function_type)
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<void(&)() noexcept> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<char(&)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int(&)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<double(&)(double, double, double) noexcept, float, float, float> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<void(&)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(&)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(&)(int), int, int> ));
+
+    // function pointer
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<void(*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(*)(int), char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int(*)(int, int), int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<double(*)(double, double, double), float, float, float> ));
+
+#if defined(__cpp_noexcept_function_type)
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<void(*)() noexcept> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<char(*)(int) noexcept, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int(*)(int, int) noexcept, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<double(*)(double, double, double) noexcept, float, float, float> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<void(*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(*)(int), int, int> ));
+
+    // object
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<F> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<F, int, int> ));
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<F, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<F, float, float, float> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<F, int, int, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<F const> ));
+
+    // member function pointer
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<void(X::*)(), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(X::*)(int), X, char> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int(X::*)(int, int), X, int, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<double(X::*)(double, double, double), X, float, float, float> ));
+
+#if defined(__cpp_noexcept_function_type)
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<void(X::*)() noexcept, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<char(X::*)(int) noexcept, X, char> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int(X::*)(int, int) noexcept, X, int, int> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<double(X::*)(double, double, double) noexcept, X, float, float, float> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<void(X::*)()> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<void(X::*)(), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<void(X::*)(), X, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(X::*)(int)> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(X::*)(int), int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(X::*)(int), X> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<char(X::*)(int), X, int, int> ));
+
+    // member data pointer
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
+
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int X::*, X> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int X::*, X const> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int X::*, X&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int X::*, X const&> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int X::*, X*> ));
+    BOOST_TEST_TRAIT_TRUE(( is_nothrow_invocable<int X::*, X const*> ));
+
+#endif
+
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int X::*> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int X::*, int> ));
+    BOOST_TEST_TRAIT_FALSE(( is_nothrow_invocable<int X::*, X, int> ));
+
+    return boost::report_errors();
+}

test/mem_fn_md_test.cpp

@@ -0,0 +1,105 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/compat/mem_fn.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int m = -1;
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( X() ), -1 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( Y() ), -1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( x ), -1 );
+        boost::compat::mem_fn( &X::m )( x ) = +1;
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( x ), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( &x ), -1 );
+        boost::compat::mem_fn( &X::m )( &x ) = +1;
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( &x ), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( std::ref(x) ), -1 );
+        boost::compat::mem_fn( &X::m )( std::ref(x) ) = +1;
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( std::ref(x) ), +1 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( std::cref(x) ), -1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( y ), -1 );
+        boost::compat::mem_fn( &X::m )( y ) = +1;
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( y ), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( &y ), -1 );
+        boost::compat::mem_fn( &X::m )( &y ) = +1;
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( &y ), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( std::ref(y) ), -1 );
+        boost::compat::mem_fn( &X::m )( std::ref(y) ) = +1;
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( std::ref(y) ), +1 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( std::cref(y) ), -1 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( x ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( std::ref(x) ), -1 );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( y ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( &y ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::m )( std::ref(y) ), -1 );
+    }
+
+    return boost::report_errors();
+}

test/mem_fn_mfn_test.cpp

@@ -0,0 +1,127 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#if defined(__GNUC__) && __GNUC__ == 7
+# pragma GCC diagnostic ignored "-Wnoexcept-type"
+#endif
+
+#include <boost/compat/mem_fn.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <functional>
+
+struct X
+{
+    int f0()
+    {
+        return -1;
+    }
+
+    int f1( int x1 ) noexcept
+    {
+        return x1;
+    }
+
+    int f2( int x1, int x2 ) const
+    {
+        return 10*x1+x2;
+    }
+
+    int f3( int x1, int x2, int x3 ) const noexcept
+    {
+        return 100*x1 + 10*x2 + x3;
+    }
+};
+
+struct Y: public virtual X
+{
+};
+
+int main()
+{
+    {
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f0 )( X() ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f1 )( X(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( X(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( X(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f0 )( Y() ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f1 )( Y(), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( Y(), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( Y(), 1, 2, 3 ), 123 );
+    }
+
+    {
+        X x;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f0 )( x ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f1 )( x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f0 )( &x ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f1 )( &x, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f0 )( std::ref(x) ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f1 )( std::ref(x), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( std::cref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( std::cref(x), 1, 2, 3 ), 123 );
+    }
+
+    {
+        Y y;
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f0 )( y ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f1 )( y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f0 )( &y ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f1 )( &y, 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( &y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( &y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f0 )( std::ref(y) ), -1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f1 )( std::ref(y), 1 ), 1 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( std::ref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( std::ref(y), 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( std::cref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( std::cref(y), 1, 2, 3 ), 123 );
+    }
+
+    {
+        X const x = {};
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( &x, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( &x, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( std::ref(x), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( std::ref(x), 1, 2, 3 ), 123 );
+    }
+
+    {
+        Y const y = {};
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( &y, 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( &y, 1, 2, 3 ), 123 );
+
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f2 )( std::ref(y), 1, 2 ), 12 );
+        BOOST_TEST_EQ( boost::compat::mem_fn( &X::f3 )( std::ref(y), 1, 2, 3 ), 123 );
+    }
+
+    return boost::report_errors();
+}

test/quick.cpp

@@ -3,6 +3,10 @@
 // https://www.boost.org/LICENSE_1_0.txt
 
 #include <boost/compat/latch.hpp>
+#include <boost/compat/shared_lock.hpp>
+#include <boost/compat/invoke.hpp>
+#include <boost/compat/bind_front.hpp>
+#include <boost/compat/bind_back.hpp>
 
 int main()
 {