Add constexpr tests for bind_back

.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)

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/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/type_traits.hpp

@@ -15,6 +15,8 @@ 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;

test/Jamfile

@@ -45,10 +45,32 @@ 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-4.8:<build>no <toolset>gcc-4.9:<build>no ;
 compile invoke_md_constexpr_test.cpp
-  : <toolset>gcc-4.8:<build>no ;
+  : <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 ;

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/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()
 {