Add BOOST_DESCRIBE_NESTED_ENUM

.github/workflows/ci.yml

@@ -159,6 +159,11 @@ jobs:
             cxxstd: "14,17,latest"
             addrmd: 32,64
             os: windows-2019
+          - toolset: msvc-14.2
+            cxxstd: "14,17,latest"
+            addrmd: 32,64
+            cxxflags: "-Zc:preprocessor"
+            os: windows-2019
           - toolset: gcc
             cxxstd: "03,11,14,17,2a"
             addrmd: 64
@@ -195,4 +200,5 @@ jobs:
         shell: cmd
         run: |
           cd ../boost-root
-          b2 -j3 libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} variant=debug,release
+          if not "${{matrix.cxxflags}}" == "" set CXXFLAGS=cxxflags=${{matrix.cxxflags}}
+          b2 -j3 libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} %CXXFLAGS% variant=debug,release

.travis.yml

@@ -22,7 +22,7 @@ matrix:
   include:
     - os: linux
       compiler: g++-5
-      env: TOOLSET=gcc CXXSTD=14-gnu,1z-gnu
+      env: TOOLSET=gcc CXXSTD=14,14-gnu,1z,1z-gnu
       addons:
         apt:
           packages:
@@ -32,7 +32,7 @@ matrix:
 
     - os: linux
       compiler: g++-6
-      env: TOOLSET=gcc CXXSTD=14-gnu,1z-gnu
+      env: TOOLSET=gcc CXXSTD=14,14-gnu,1z,1z-gnu
       addons:
         apt:
           packages:
@@ -42,7 +42,7 @@ matrix:
 
     - os: linux
       compiler: g++-7
-      env: TOOLSET=gcc CXXSTD=14-gnu,17-gnu
+      env: TOOLSET=gcc CXXSTD=14,14-gnu,17,17-gnu
       addons:
         apt:
           packages:

README.md

@@ -7,8 +7,7 @@ and usage examples.
 
 ## Supported Compilers
 
-* GCC 5 or later with `-std=gnu++14` or above
-* GCC 8 or later with `-std=c++14` or above
+* GCC 5 or later with `-std=c++14` or above
 * Clang 3.6 or later with `-std=c++14` or above
 * Visual Studio 2015, 2017, 2019
 

appveyor.yml

@@ -31,6 +31,11 @@ environment:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       TOOLSET: clang-win
       CXXSTD: 14,17,latest
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      TOOLSET: msvc-14.2
+      CXXSTD: 14,17,latest
+      ADDRMD: 32,64
+      CXXFLAGS: -Zc:preprocessor
 
 install:
   - set BOOST_BRANCH=develop
@@ -49,4 +54,5 @@ build: off
 test_script:
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
   - if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
-  - b2 -j3 libs/describe/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release embed-manifest-via=linker
+  - if not "%CXXFLAGS%" == "" set CXXFLAGS=cxxflags=%CXXFLAGS%
+  - b2 -j3 libs/describe/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% %CXXFLAGS% variant=debug,release embed-manifest-via=linker

doc/describe.adoc

@@ -10,6 +10,8 @@ Peter Dimov
 :toclevels: 4
 :idprefix:
 :docinfo: private-footer
+:source-highlighter: rouge
+:source-language: c++
 
 :leveloffset: +1
 

doc/describe/classes.adoc

@@ -8,6 +8,8 @@ https://www.boost.org/LICENSE_1_0.txt
 # Describing Class Types
 :idprefix: classes_
 
+## Class Types with Public Members
+
 If you have a `struct`
 
 ```
@@ -31,8 +33,15 @@ It takes three arguments: the `struct` name, a list of base classes
 (empty in our example), and a list of (public) members by name (this includes
 both data members and member functions.)
 
-To describe a class type with protected or private members, use the
-`BOOST_DESCRIBE_CLASS` macro instead, placing it _inside the class_.
+Since `BOOST_DESCRIBE_STRUCT` is placed outside the type, it's non-intrisive,
+does not require access to the definition, and can therefore be used to describe
+third-party types or types defined in system headers.
+
+## Class Types with Protected or Private Members
+
+To describe a class type, use the `BOOST_DESCRIBE_CLASS` macro instead, placing
+it _inside the class_. This gives the macro access to the protected and private
+members, but is intrusive and requires access to the definition.
 
 ```
 class Y: private X
@@ -73,17 +82,11 @@ These primitives are defined in namespace `boost::describe`, in the headers
 presence of `mod_public` includes the public bases in the result, its absence
 excludes them. The other two modifiers work similarly.
 
-(At least in principle. The current implementation cannot distinguish between
-protected and private base classes, so protected bases are returned as private.
-Consequently, using `mod_protected` gives no result. Lifting this limitation
-would require compiler support.)
-
 `describe_members` takes a bitwise-or combination of the following possible
 modifiers: `mod_public`, `mod_protected`, `mod_private`, `mod_static`,
 `mod_function`, `mod_inherited`, `mod_hidden`.
 
-The access modifiers work the same as with `describe_bases` (except here
-`mod_protected` actually works when `BOOST_DESCRIBE_CLASS` is used.)
+The access modifiers work the same as with `describe_bases`.
 
 (For types annotated with `BOOST_DESCRIBE_STRUCT`, the protected and private
 member lists will be empty.)
@@ -127,3 +130,55 @@ For an example of how to use the base and data member descriptors, see
 
 For an example of how to use member function descriptors, see
 <<example_json_rpc>>.
+
+## Overloaded Member Functions
+
+To describe an overloaded member function, you will need to resort to
+a more complicated syntax, as simply listing its name (say, `f`) will make
+the library attempt to form a member pointer with `&X::f`, which would fail
+because it's not clear to which `f` this expression refers.
+
+To disambiguate, precede the function name with the type of the function, in
+parentheses, as shown in the following example:
+
+```
+struct X
+{
+    int f();
+    int f() const;
+    void f( int x );
+};
+
+BOOST_DESCRIBE_STRUCT(X, (), (
+    (int ()) f,
+    (int () const) f,
+    (void (int)) f
+))
+```
+
+The type of the function is the same as its declaration, without the name.
+
+Be sure to retain the space between the parenthesized function type and its name,
+because omitting it will compile happily on GCC and Clang but will lead to
+inscrutable errors on MSVC due to its nonstandard preprocessor.
+
+Pay attention to the proper placement of the parentheses, because a mistake there
+will also lead to hard to decipher compiler errors, on all compilers.
+
+The same technique also works with `BOOST_DESCRIBE_CLASS`, and with static member
+functions:
+
+```
+class Y
+{
+public:
+
+    static void f( int x );
+    static void f( int x, int y );
+
+    BOOST_DESCRIBE_CLASS(Y, (), ((void (int)) f, (void (int, int)) f), (), ())
+};
+```
+
+The case where a member function and a static member function have the same name
+and the same function type is currently not supported.

doc/describe/enums.adoc

@@ -28,8 +28,6 @@ BOOST_DESCRIBE_ENUM(E, v1, v2, v3)
 The macro is defined in `<boost/describe/enum.hpp>` and should be placed in
 the same namespace as the enum.
 
-For scoped enums, use `BOOST_DESCRIBE_ENUM_CLASS` instead.
-
 If your enumerators don't have initializers, instead of repeating them
 
 ```

doc/describe/implementation.adoc

@@ -14,8 +14,7 @@ https://boost.org/libs/mp11[Boost.Mp11].
 
 ## Supported Compilers
 
-* GCC 5 or later with `-std=gnu++14` or above
-* GCC 8 or later with `-std=c++14` or above
+* GCC 5 or later with `-std=c++14` or above
 * Clang 3.6 or later with `-std=c++14` or above
 * Visual Studio 2015, 2017, 2019
 
@@ -26,10 +25,13 @@ https://ci.appveyor.com/project/pdimov/describe[Appveyor].
 
 This implementation has the following limitations:
 
+* Up to 52 elements are supported in the lists of enumerators,
+  bases, and members.
 * Protected base classes cannot be distinguished from private
-  base classes and are considered private.
-* Overloaded member functions are not supported. Member names
-  must be unique within the class.
-* Bitfields are not supported.
+  base classes when the described class is final, and are considered
+  private.
+* Bitfields are not supported. It's not possible to form a pointer
+  to member to a bitfield.
+* Reference members are not supported. It's not possible to form a
+  pointer to member to a reference.
 * Anonymous unions are not supported.
-* Reference members are not supported.

doc/describe/reference.adoc

@@ -48,12 +48,6 @@ struct Di
 ```
 where `vi` is the corresponding identifier passed to the macro.
 
-### BOOST_DESCRIBE_ENUM_CLASS
-
-`BOOST_DESCRIBE_ENUM_CLASS(E, v1, ..., vN)` should be used instead of
-`BOOST_DESCRIBE_ENUM` when `E` is a scoped enumeration type, and has
-the same effect.
-
 ### BOOST_DEFINE_ENUM
 
 `BOOST_DEFINE_ENUM(E, v1, v2, ..., vN)` is a convenience macro expanding to
@@ -67,7 +61,7 @@ BOOST_DESCRIBE_ENUM(E, v1, v2, ..., vN)
 `BOOST_DEFINE_ENUM_CLASS(E, v1, v2, ..., vN)` is a convenience macro expanding to
 ```
 enum class E { v1, v2, ..., vN };
-BOOST_DESCRIBE_ENUM_CLASS(E, v1, v2, ..., vN)
+BOOST_DESCRIBE_ENUM(E, v1, v2, ..., vN)
 ```
 
 ### BOOST_DEFINE_FIXED_ENUM
@@ -83,7 +77,7 @@ BOOST_DESCRIBE_ENUM(E, v1, v2, ..., vN)
 `BOOST_DEFINE_FIXED_ENUM_CLASS(E, Base, v1, v2, ..., vN)` is a convenience macro expanding to
 ```
 enum class E: Base { v1, v2, ..., vN };
-BOOST_DESCRIBE_ENUM_CLASS(E, v1, v2, ..., vN)
+BOOST_DESCRIBE_ENUM(E, v1, v2, ..., vN)
 ```
 
 ## <boost/describe/enumerators.hpp>

include/boost/describe/bases.hpp

@@ -19,7 +19,7 @@ namespace describe
 namespace detail
 {
 
-template<class T> using _describe_bases = decltype( _base_descriptor_fn( static_cast<T*>(0) ) );
+template<class T> using _describe_bases = decltype( boost_base_descriptor_fn( static_cast<T*>(0) ) );
 
 template<unsigned M> struct base_filter
 {

include/boost/describe/class.hpp

@@ -16,6 +16,7 @@
 
 #include <boost/describe/detail/bases.hpp>
 #include <boost/describe/detail/members.hpp>
+#include <type_traits>
 
 namespace boost
 {
@@ -33,6 +34,7 @@ namespace describe
     friend BOOST_DESCRIBE_PRIVATE_MEMBERS(C, BOOST_DESCRIBE_PP_UNPACK Private)
 
 #define BOOST_DESCRIBE_STRUCT(C, Bases, Members) \
+    static_assert(std::is_class<C>::value, "BOOST_DESCRIBE_STRUCT should only be used with class types"); \
     BOOST_DESCRIBE_BASES(C, BOOST_DESCRIBE_PP_UNPACK Bases) \
     BOOST_DESCRIBE_PUBLIC_MEMBERS(C, BOOST_DESCRIBE_PP_UNPACK Members) \
     BOOST_DESCRIBE_PROTECTED_MEMBERS(C) \
@@ -58,6 +60,7 @@ namespace describe
     friend BOOST_DESCRIBE_PRIVATE_MEMBERS_(C BOOST_DESCRIBE_PP_UNPACK Private)
 
 #define BOOST_DESCRIBE_STRUCT(C, Bases, Members) \
+    static_assert(std::is_class<C>::value, "BOOST_DESCRIBE_STRUCT should only be used with class types"); \
     BOOST_DESCRIBE_BASES_(C BOOST_DESCRIBE_PP_UNPACK Bases) \
     BOOST_DESCRIBE_PUBLIC_MEMBERS_(C BOOST_DESCRIBE_PP_UNPACK Members) \
     BOOST_DESCRIBE_PROTECTED_MEMBERS_(C) \

include/boost/describe/detail/bases.hpp

@@ -37,12 +37,12 @@ template<class... T> auto base_descriptor_fn_impl( int, T... )
 
 #if defined(_MSC_VER) && !defined(__clang__)
 
-#define BOOST_DESCRIBE_BASES(C, ...) inline auto _base_descriptor_fn( C * ) \
+#define BOOST_DESCRIBE_BASES(C, ...) inline auto boost_base_descriptor_fn( C * ) \
 { return boost::describe::detail::base_descriptor_fn_impl( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_BASE_IMPL, C, __VA_ARGS__) ); }
 
 #else
 
-#define BOOST_DESCRIBE_BASES(C, ...) inline auto _base_descriptor_fn( C * ) \
+#define BOOST_DESCRIBE_BASES(C, ...) inline auto boost_base_descriptor_fn( C * ) \
 { return boost::describe::detail::base_descriptor_fn_impl( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_BASE_IMPL, C, ##__VA_ARGS__) ); }
 
 #endif

include/boost/describe/detail/config.hpp

@@ -21,11 +21,6 @@
 
 #endif
 
-#if defined(BOOST_DESCRIBE_CXX14) && defined(__GNUC__) && !defined(__clang__) && __GNUC__ >= 5 && __GNUC__ <= 7 && defined(__STRICT_ANSI__)
-// g++ 5..7 with -std=c++14 doesn't support the variadic extension we need, use -std=gnu++14
-# undef BOOST_DESCRIBE_CXX14
-#endif
-
 #if defined(BOOST_DESCRIBE_CXX11)
 # define BOOST_DESCRIBE_CONSTEXPR_OR_CONST constexpr
 #else

include/boost/describe/detail/members.hpp

@@ -7,6 +7,7 @@
 
 #include <boost/describe/modifiers.hpp>
 #include <boost/describe/detail/pp_for_each.hpp>
+#include <boost/describe/detail/pp_utilities.hpp>
 #include <boost/describe/detail/list.hpp>
 #include <type_traits>
 
@@ -43,30 +44,33 @@ template<unsigned M, class... T> auto member_descriptor_fn_impl( int, T... )
     return list<member_descriptor<T, M>...>();
 }
 
-#define BOOST_DESCRIBE_MEMBER_IMPL(C, m) , []{ struct D { \
-    static constexpr auto pointer() noexcept { return &C::m; } \
-    static constexpr auto name() noexcept { return #m; } }; return D(); }()
+template<class C, class F> constexpr auto mfn( F C::* p ) { return p; }
+template<class C, class F> constexpr auto mfn( F * p ) { return p; }
+
+#define BOOST_DESCRIBE_MEMBER_IMPL(C, m) , []{ struct _boost_desc { \
+    static constexpr auto pointer() noexcept { return BOOST_DESCRIBE_PP_POINTER(C, m); } \
+    static constexpr auto name() noexcept { return BOOST_DESCRIBE_PP_NAME(m); } }; return _boost_desc(); }()
 
 #if defined(_MSC_VER) && !defined(__clang__)
 
-#define BOOST_DESCRIBE_PUBLIC_MEMBERS(C, ...) inline auto _public_member_descriptor_fn( C * ) \
+#define BOOST_DESCRIBE_PUBLIC_MEMBERS(C, ...) inline auto boost_public_member_descriptor_fn( C * ) \
 { return boost::describe::detail::member_descriptor_fn_impl<boost::describe::mod_public>( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_MEMBER_IMPL, C, __VA_ARGS__) ); }
 
-#define BOOST_DESCRIBE_PROTECTED_MEMBERS(C, ...) inline auto _protected_member_descriptor_fn( C * ) \
+#define BOOST_DESCRIBE_PROTECTED_MEMBERS(C, ...) inline auto boost_protected_member_descriptor_fn( C * ) \
 { return boost::describe::detail::member_descriptor_fn_impl<boost::describe::mod_protected>( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_MEMBER_IMPL, C, __VA_ARGS__) ); }
 
-#define BOOST_DESCRIBE_PRIVATE_MEMBERS(C, ...) inline auto _private_member_descriptor_fn( C * ) \
+#define BOOST_DESCRIBE_PRIVATE_MEMBERS(C, ...) inline auto boost_private_member_descriptor_fn( C * ) \
 { return boost::describe::detail::member_descriptor_fn_impl<boost::describe::mod_private>( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_MEMBER_IMPL, C, __VA_ARGS__) ); }
 
 #else
 
-#define BOOST_DESCRIBE_PUBLIC_MEMBERS(C, ...) inline auto _public_member_descriptor_fn( C * ) \
+#define BOOST_DESCRIBE_PUBLIC_MEMBERS(C, ...) inline auto boost_public_member_descriptor_fn( C * ) \
 { return boost::describe::detail::member_descriptor_fn_impl<boost::describe::mod_public>( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_MEMBER_IMPL, C, ##__VA_ARGS__) ); }
 
-#define BOOST_DESCRIBE_PROTECTED_MEMBERS(C, ...) inline auto _protected_member_descriptor_fn( C * ) \
+#define BOOST_DESCRIBE_PROTECTED_MEMBERS(C, ...) inline auto boost_protected_member_descriptor_fn( C * ) \
 { return boost::describe::detail::member_descriptor_fn_impl<boost::describe::mod_protected>( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_MEMBER_IMPL, C, ##__VA_ARGS__) ); }
 
-#define BOOST_DESCRIBE_PRIVATE_MEMBERS(C, ...) inline auto _private_member_descriptor_fn( C * ) \
+#define BOOST_DESCRIBE_PRIVATE_MEMBERS(C, ...) inline auto boost_private_member_descriptor_fn( C * ) \
 { return boost::describe::detail::member_descriptor_fn_impl<boost::describe::mod_private>( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_MEMBER_IMPL, C, ##__VA_ARGS__) ); }
 
 #endif

include/boost/describe/detail/pp_for_each.hpp

@@ -5,66 +5,66 @@
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
-#define BOOST_DESCRIBE_PP_EXPAND(x) x
+#include <boost/describe/detail/pp_utilities.hpp>
 
 #define BOOST_DESCRIBE_PP_FOR_EACH_0(F, a)
-#define BOOST_DESCRIBE_PP_FOR_EACH_1(F, a, x) F(a, x)
-#define BOOST_DESCRIBE_PP_FOR_EACH_2(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_1(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_3(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_2(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_4(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_3(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_5(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_4(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_6(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_5(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_7(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_6(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_8(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_7(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_9(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_8(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_10(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_9(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_11(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_10(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_12(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_11(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_13(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_12(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_14(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_13(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_15(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_14(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_16(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_15(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_17(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_16(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_18(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_17(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_19(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_18(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_20(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_19(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_21(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_20(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_22(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_21(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_23(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_22(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_24(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_23(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_25(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_24(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_26(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_25(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_27(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_26(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_28(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_27(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_29(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_28(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_30(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_29(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_31(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_30(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_32(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_31(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_33(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_32(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_34(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_33(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_35(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_34(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_36(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_35(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_37(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_36(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_38(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_37(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_39(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_38(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_40(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_39(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_41(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_40(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_42(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_41(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_43(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_42(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_44(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_43(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_45(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_44(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_46(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_45(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_47(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_46(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_48(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_47(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_49(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_48(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_50(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_49(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_51(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_50(F, a, __VA_ARGS__))
-#define BOOST_DESCRIBE_PP_FOR_EACH_52(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(F(a, x) BOOST_DESCRIBE_PP_FOR_EACH_51(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_1(F, a, x) BOOST_DESCRIBE_PP_CALL(F, a, x)
+#define BOOST_DESCRIBE_PP_FOR_EACH_2(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_1(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_3(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_2(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_4(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_3(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_5(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_4(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_6(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_5(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_7(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_6(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_8(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_7(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_9(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_8(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_10(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_9(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_11(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_10(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_12(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_11(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_13(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_12(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_14(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_13(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_15(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_14(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_16(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_15(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_17(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_16(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_18(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_17(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_19(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_18(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_20(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_19(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_21(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_20(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_22(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_21(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_23(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_22(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_24(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_23(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_25(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_24(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_26(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_25(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_27(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_26(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_28(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_27(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_29(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_28(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_30(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_29(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_31(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_30(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_32(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_31(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_33(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_32(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_34(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_33(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_35(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_34(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_36(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_35(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_37(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_36(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_38(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_37(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_39(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_38(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_40(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_39(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_41(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_40(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_42(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_41(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_43(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_42(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_44(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_43(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_45(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_44(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_46(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_45(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_47(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_46(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_48(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_47(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_49(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_48(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_50(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_49(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_51(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_50(F, a, __VA_ARGS__))
+#define BOOST_DESCRIBE_PP_FOR_EACH_52(F, a, x, ...) BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_FOR_EACH_51(F, a, __VA_ARGS__))
 
-#define BOOST_DESCRIBE_PP_EXTRACT(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, _31, _32, _33, _34, _35, _36, _37, _38, _39, _40, _41, _42, _43, _44, _45, _46, _47, _48, _49, _50, _51, _52, V, ...) V
+#define BOOST_DESCRIBE_PP_FE_EXTRACT(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, _31, _32, _33, _34, _35, _36, _37, _38, _39, _40, _41, _42, _43, _44, _45, _46, _47, _48, _49, _50, _51, _52, V, ...) V
 
 #define BOOST_DESCRIBE_PP_FOR_EACH(F, ...) \
-    BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_EXTRACT(__VA_ARGS__, \
+    BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_EXPAND(BOOST_DESCRIBE_PP_FE_EXTRACT(__VA_ARGS__, \
     BOOST_DESCRIBE_PP_FOR_EACH_52, \
     BOOST_DESCRIBE_PP_FOR_EACH_51, \
     BOOST_DESCRIBE_PP_FOR_EACH_50, \

include/boost/describe/detail/pp_utilities.hpp

@@ -0,0 +1,92 @@
+#ifndef BOOST_DESCRIBE_DETAIL_PP_UTILITIES_HPP_INCLUDED
+#define BOOST_DESCRIBE_DETAIL_PP_UTILITIES_HPP_INCLUDED
+
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#define BOOST_DESCRIBE_PP_EXPAND(x) x
+
+#define BOOST_DESCRIBE_PP_CAT(x, y) BOOST_DESCRIBE_PP_CAT_I(x, y)
+#define BOOST_DESCRIBE_PP_CAT_I(x, ...) x ## __VA_ARGS__
+
+#if defined(_MSC_VER) && !defined(__clang__)
+
+#define BOOST_DESCRIBE_PP_FIRST(x) BOOST_DESCRIBE_PP_FIRST_I((x))
+#define BOOST_DESCRIBE_PP_FIRST_I(x) BOOST_DESCRIBE_PP_FIRST_II x
+#define BOOST_DESCRIBE_PP_FIRST_II(x, ...) x
+
+#else
+
+#define BOOST_DESCRIBE_PP_FIRST(x) BOOST_DESCRIBE_PP_FIRST_I(x)
+#define BOOST_DESCRIBE_PP_FIRST_I(x, ...) x
+
+#endif
+
+#define BOOST_DESCRIBE_PP_IS_PAREN_I(x) BOOST_DESCRIBE_PP_CAT(BOOST_DESCRIBE_PP_IS_PAREN_I_, BOOST_DESCRIBE_PP_IS_PAREN_II x)
+#define BOOST_DESCRIBE_PP_IS_PAREN_II(...) 0
+#define BOOST_DESCRIBE_PP_IS_PAREN_I_0 1,
+#define BOOST_DESCRIBE_PP_IS_PAREN_I_BOOST_DESCRIBE_PP_IS_PAREN_II 0,
+
+#define BOOST_DESCRIBE_PP_IS_PAREN(x) BOOST_DESCRIBE_PP_FIRST(BOOST_DESCRIBE_PP_IS_PAREN_I(x))
+
+#define BOOST_DESCRIBE_PP_EMPTY
+
+#define BOOST_DESCRIBE_PP_IS_EMPTY(x) BOOST_DESCRIBE_PP_IS_EMPTY_I(BOOST_DESCRIBE_PP_IS_PAREN(x), BOOST_DESCRIBE_PP_IS_PAREN(x BOOST_DESCRIBE_PP_EMPTY ()))
+#define BOOST_DESCRIBE_PP_IS_EMPTY_I(x, y) BOOST_DESCRIBE_PP_IS_EMPTY_II(x, y)
+#define BOOST_DESCRIBE_PP_IS_EMPTY_II(x, y) BOOST_DESCRIBE_PP_IS_EMPTY_III(x, y)
+#define BOOST_DESCRIBE_PP_IS_EMPTY_III(x, y) BOOST_DESCRIBE_PP_IS_EMPTY_III_ ## x ## y
+#define BOOST_DESCRIBE_PP_IS_EMPTY_III_00 0
+#define BOOST_DESCRIBE_PP_IS_EMPTY_III_01 1
+#define BOOST_DESCRIBE_PP_IS_EMPTY_III_10 0
+#define BOOST_DESCRIBE_PP_IS_EMPTY_III_11 0
+
+#define BOOST_DESCRIBE_PP_CALL(F, a, x) BOOST_DESCRIBE_PP_CAT(BOOST_DESCRIBE_PP_CALL_I_, BOOST_DESCRIBE_PP_IS_EMPTY(x))(F, a, x)
+#define BOOST_DESCRIBE_PP_CALL_I_0(F, a, x) F(a, x)
+#define BOOST_DESCRIBE_PP_CALL_I_1(F, a, x)
+
+#define BOOST_DESCRIBE_PP_PARSE(x) BOOST_DESCRIBE_PP_CAT(BOOST_DESCRIBE_PP_PARSE_I_, BOOST_DESCRIBE_PP_PARSE_II x)
+#define BOOST_DESCRIBE_PP_PARSE_II(...) 0, (__VA_ARGS__),
+#define BOOST_DESCRIBE_PP_PARSE_I_BOOST_DESCRIBE_PP_PARSE_II 0, ~,
+#define BOOST_DESCRIBE_PP_PARSE_I_0 1
+
+#if defined(_MSC_VER) && !defined(__clang__)
+
+#define BOOST_DESCRIBE_PP_NAME(x) BOOST_DESCRIBE_PP_NAME_I(BOOST_DESCRIBE_PP_PARSE(x))
+#define BOOST_DESCRIBE_PP_NAME_I(x) BOOST_DESCRIBE_PP_NAME_II((x))
+#define BOOST_DESCRIBE_PP_NAME_II(x) BOOST_DESCRIBE_PP_NAME_III x
+#define BOOST_DESCRIBE_PP_NAME_III(x, y, z) #z
+
+#else
+
+#define BOOST_DESCRIBE_PP_NAME(x) BOOST_DESCRIBE_PP_NAME_I(BOOST_DESCRIBE_PP_PARSE(x))
+#define BOOST_DESCRIBE_PP_NAME_I(x) BOOST_DESCRIBE_PP_NAME_II(x)
+#define BOOST_DESCRIBE_PP_NAME_II(x, y, z) #z
+
+#endif
+
+// template<class C, class F> constexpr auto mfn( F C::* p ) { return p; }
+// template<class C, class F> constexpr auto mfn( F * p ) { return p; }
+
+#define BOOST_DESCRIBE_PP_POINTER(C, x) BOOST_DESCRIBE_PP_POINTER_I(C, BOOST_DESCRIBE_PP_PARSE(x))
+
+#define BOOST_DESCRIBE_PP_EXPAND_V(...) __VA_ARGS__
+
+#if defined(_MSC_VER) && !defined(__clang__)
+
+#define BOOST_DESCRIBE_PP_POINTER_I(C, x) BOOST_DESCRIBE_PP_POINTER_II((C, x))
+#define BOOST_DESCRIBE_PP_POINTER_II(x) BOOST_DESCRIBE_PP_POINTER_III x
+#define BOOST_DESCRIBE_PP_POINTER_III(C, x, y, z) BOOST_DESCRIBE_PP_POINTER_III_##x(C, y, z)
+#define BOOST_DESCRIBE_PP_POINTER_III_0(C, y, z) &C::z
+#define BOOST_DESCRIBE_PP_POINTER_III_1(C, y, z) ::boost::describe::detail::mfn<C, BOOST_DESCRIBE_PP_EXPAND_V y>(&C::z)
+
+#else
+
+#define BOOST_DESCRIBE_PP_POINTER_I(C, x) BOOST_DESCRIBE_PP_POINTER_II(C, x)
+#define BOOST_DESCRIBE_PP_POINTER_II(C, x, y, z) BOOST_DESCRIBE_PP_POINTER_III_##x(C, y, z)
+#define BOOST_DESCRIBE_PP_POINTER_III_0(C, y, z) &C::z
+#define BOOST_DESCRIBE_PP_POINTER_III_1(C, y, z) ::boost::describe::detail::mfn<C, BOOST_DESCRIBE_PP_EXPAND_V y>(&C::z)
+
+#endif
+
+#endif // #ifndef BOOST_DESCRIBE_DETAIL_PP_UTILITIES_HPP_INCLUDED

include/boost/describe/enum.hpp

@@ -5,17 +5,19 @@
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
-#include <boost/describe/detail/pp_for_each.hpp>
-#include <boost/describe/detail/list.hpp>
 #include <boost/describe/detail/config.hpp>
 
 #if !defined(BOOST_DESCRIBE_CXX14)
 
 #define BOOST_DESCRIBE_ENUM(E, ...)
-#define BOOST_DESCRIBE_ENUM_CLASS(E, ...)
+#define BOOST_DESCRIBE_NESTED_ENUM(E, ...)
 
 #else
 
+#include <boost/describe/detail/pp_for_each.hpp>
+#include <boost/describe/detail/list.hpp>
+#include <type_traits>
+
 namespace boost
 {
 namespace describe
@@ -39,31 +41,69 @@ template<class... T> auto enum_descriptor_fn_impl( int, T... )
     return list<enum_descriptor<T>...>();
 }
 
-#define BOOST_DESCRIBE_ENUM_IMPL(E, e) , []{ struct D { \
-    static constexpr auto value() noexcept { return e; } \
-    static constexpr auto name() noexcept { return #e; } }; return D(); }()
+#define BOOST_DESCRIBE_ENUM_BEGIN(E) \
+    inline auto boost_enum_descriptor_fn( E* ) \
+    { return boost::describe::detail::enum_descriptor_fn_impl( 0
 
-#define BOOST_DESCRIBE_ENUM_CLASS_IMPL(E, e) , []{ struct D { \
+#define BOOST_DESCRIBE_ENUM_ENTRY(E, e) , []{ struct _boost_desc { \
     static constexpr auto value() noexcept { return E::e; } \
-    static constexpr auto name() noexcept { return #e; } }; return D(); }()
+    static constexpr auto name() noexcept { return #e; } }; return _boost_desc(); }()
+
+#define BOOST_DESCRIBE_ENUM_END(E) ); }
 
 } // namespace detail
 
-#define BOOST_DESCRIBE_ENUM(E, ...) inline auto _enum_descriptor_fn( E* ) \
-{ return boost::describe::detail::enum_descriptor_fn_impl( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_IMPL, E, __VA_ARGS__) ); }
+#if defined(_MSC_VER) && !defined(__clang__)
 
-#define BOOST_DESCRIBE_ENUM_CLASS(E, ...) inline auto _enum_descriptor_fn( E* ) \
-{ return boost::describe::detail::enum_descriptor_fn_impl( 0 BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_CLASS_IMPL, E, __VA_ARGS__) ); }
+#define BOOST_DESCRIBE_ENUM(E, ...) \
+    static_assert(std::is_enum<E>::value, "BOOST_DESCRIBE_ENUM should only be used with enums"); \
+    BOOST_DESCRIBE_ENUM_BEGIN(E) \
+    BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_ENTRY, E, __VA_ARGS__) \
+    BOOST_DESCRIBE_ENUM_END(E)
+
+#define BOOST_DESCRIBE_NESTED_ENUM(E, ...) \
+    static_assert(std::is_enum<E>::value, "BOOST_DESCRIBE_NESTED_ENUM should only be used with enums"); \
+    friend BOOST_DESCRIBE_ENUM_BEGIN(E) \
+    BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_ENTRY, E, __VA_ARGS__) \
+    BOOST_DESCRIBE_ENUM_END(E)
+
+#else
+
+#define BOOST_DESCRIBE_ENUM(E, ...) \
+    static_assert(std::is_enum<E>::value, "BOOST_DESCRIBE_ENUM should only be used with enums"); \
+    BOOST_DESCRIBE_ENUM_BEGIN(E) \
+    BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_ENTRY, E, ##__VA_ARGS__) \
+    BOOST_DESCRIBE_ENUM_END(E)
+
+#define BOOST_DESCRIBE_NESTED_ENUM(E, ...) \
+    static_assert(std::is_enum<E>::value, "BOOST_DESCRIBE_NESTED_ENUM should only be used with enums"); \
+    friend BOOST_DESCRIBE_ENUM_BEGIN(E) \
+    BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_ENTRY, E, ##__VA_ARGS__) \
+    BOOST_DESCRIBE_ENUM_END(E)
+
+#endif
 
 } // namespace describe
 } // namespace boost
 
 #endif // defined(BOOST_DESCRIBE_CXX14)
 
+#if defined(_MSC_VER) && !defined(__clang__)
+
 #define BOOST_DEFINE_ENUM(E, ...) enum E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, __VA_ARGS__)
-#define BOOST_DEFINE_ENUM_CLASS(E, ...) enum class E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM_CLASS(E, __VA_ARGS__)
+#define BOOST_DEFINE_ENUM_CLASS(E, ...) enum class E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, __VA_ARGS__)
 
 #define BOOST_DEFINE_FIXED_ENUM(E, Base, ...) enum E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, __VA_ARGS__)
-#define BOOST_DEFINE_FIXED_ENUM_CLASS(E, Base, ...) enum class E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM_CLASS(E, __VA_ARGS__)
+#define BOOST_DEFINE_FIXED_ENUM_CLASS(E, Base, ...) enum class E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, __VA_ARGS__)
+
+#else
+
+#define BOOST_DEFINE_ENUM(E, ...) enum E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, ##__VA_ARGS__)
+#define BOOST_DEFINE_ENUM_CLASS(E, ...) enum class E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, ##__VA_ARGS__)
+
+#define BOOST_DEFINE_FIXED_ENUM(E, Base, ...) enum E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, ##__VA_ARGS__)
+#define BOOST_DEFINE_FIXED_ENUM_CLASS(E, Base, ...) enum class E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, ##__VA_ARGS__)
+
+#endif
 
 #endif // #ifndef BOOST_DESCRIBE_ENUM_HPP_INCLUDED

include/boost/describe/enumerators.hpp

@@ -14,7 +14,7 @@ namespace boost
 namespace describe
 {
 
-template<class E> using describe_enumerators = decltype( _enum_descriptor_fn( static_cast<E*>(0) ) );
+template<class E> using describe_enumerators = decltype( boost_enum_descriptor_fn( static_cast<E*>(0) ) );
 
 } // namespace describe
 } // namespace boost

include/boost/describe/members.hpp

@@ -25,9 +25,9 @@ namespace detail
 
 // _describe_members<T>
 
-template<class T> using _describe_public_members = decltype( _public_member_descriptor_fn( static_cast<T*>(0) ) );
-template<class T> using _describe_protected_members = decltype( _protected_member_descriptor_fn( static_cast<T*>(0) ) );
-template<class T> using _describe_private_members = decltype( _private_member_descriptor_fn( static_cast<T*>(0) ) );
+template<class T> using _describe_public_members = decltype( boost_public_member_descriptor_fn( static_cast<T*>(0) ) );
+template<class T> using _describe_protected_members = decltype( boost_protected_member_descriptor_fn( static_cast<T*>(0) ) );
+template<class T> using _describe_private_members = decltype( boost_private_member_descriptor_fn( static_cast<T*>(0) ) );
 
 template<class T> using _describe_members = mp11::mp_append<_describe_public_members<T>, _describe_protected_members<T>, _describe_private_members<T>>;
 

test/Jamfile

@@ -15,8 +15,17 @@ project : requirements
 run quick.cpp ;
 
 run pp_for_each_test.cpp ;
+run pp_is_paren_test.cpp ;
+run pp_is_empty_test.cpp ;
+run pp_call_test.cpp ;
+run pp_parse_test.cpp ;
+run pp_name_test.cpp ;
+run pp_pointer_test.cpp ;
 
 run enumerators_test.cpp ;
+run empty_enum_test.cpp ;
+run trailing_comma_test.cpp ;
+run nested_enum_test.cpp ;
 
 run compute_base_modifiers.cpp ;
 run bases_test.cpp ;
@@ -28,13 +37,20 @@ run members_test4.cpp ;
 run members_test5.cpp ;
 run members_test6.cpp ;
 run members_test7.cpp : : : <toolset>msvc-14.0:<build>no ;
+run overloaded_test.cpp ;
+run overloaded_test2.cpp ;
+
+compile test_d_type.cpp ;
+
+compile-fail enum_struct_fail.cpp ;
+compile-fail struct_enum_fail.cpp ;
 
 obj describe_cxx14 : describe_cxx14.cpp ;
 explicit describe_cxx14 ;
 
 local CXX14 = [ check-target-builds describe_cxx14 describe_cxx14 : : <build>no ] ;
 
-local JSON = <library>/boost//json/<warnings>off "<toolset>msvc-14.0:<build>no" ;
+local JSON = <library>/boost//json/<warnings>off "<toolset>msvc-14.0:<build>no" "<toolset>msvc-14.2:<cxxflags>-wd5104" ;
 local SERIALIZATION = <library>/boost//serialization/<warnings>off "-<toolset>clang:<warnings-as-errors>on" ;
 
 run ../example/printing_enums_ct.cpp : : : $(CXX14) ;

test/empty_enum_test.cpp

@@ -0,0 +1,41 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/enumerators.hpp>
+#include <boost/describe/enum.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+enum E1 {};
+BOOST_DESCRIBE_ENUM(E1)
+
+BOOST_DEFINE_ENUM(E2)
+
+#if !defined(BOOST_DESCRIBE_CXX14)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++14 is not available")
+int main() {}
+
+#else
+
+#include <boost/mp11.hpp>
+using namespace boost::mp11;
+
+int main()
+{
+    {
+        using D1 = boost::describe::describe_enumerators<E1>;
+        BOOST_TEST_EQ( mp_size<D1>::value, 0 );
+    }
+
+    {
+        using D2 = boost::describe::describe_enumerators<E2>;
+        BOOST_TEST_EQ( mp_size<D2>::value, 0 );
+    }
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX14)

test/enum_struct_fail.cpp

@@ -0,0 +1,16 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/class.hpp>
+
+#if !defined(BOOST_DESCRIBE_CXX14)
+
+#error "Skipping test because C++14 is not available"
+
+#else
+
+enum E1 {};
+BOOST_DESCRIBE_STRUCT(E1, (), ())
+
+#endif // !defined(BOOST_DESCRIBE_CXX14)

test/enumerators_test.cpp

@@ -6,6 +6,37 @@
 #include <boost/describe/enum.hpp>
 #include <boost/core/lightweight_test.hpp>
 
+enum E1
+{
+    v1_1 = 5
+};
+
+BOOST_DESCRIBE_ENUM(E1, v1_1);
+
+BOOST_DEFINE_ENUM(E3, v3_1, v3_2, v3_3);
+
+#if !defined(BOOST_DESCRIBE_CXX11)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++11 is not available")
+int main() {}
+
+#else
+
+enum class E2
+{
+    v2_1,
+    v2_2 = 7
+};
+
+BOOST_DESCRIBE_ENUM(E2, v2_1, v2_2);
+
+BOOST_DEFINE_FIXED_ENUM(E4, int, v4_1, v4_2, v4_3, v4_4);
+
+BOOST_DEFINE_ENUM_CLASS(E5, v5_1, v5_2, v5_3, v5_4, v5_5);
+BOOST_DEFINE_FIXED_ENUM_CLASS(E6, int, v6_1, v6_2, v6_3, v6_4, v6_5, v6_6);
+
 #if !defined(BOOST_DESCRIBE_CXX14)
 
 #include <boost/config/pragma_message.hpp>
@@ -15,27 +46,6 @@ int main() {}
 
 #else
 
-enum E1
-{
-    v1_1 = 5
-};
-
-BOOST_DESCRIBE_ENUM(E1, v1_1);
-
-enum class E2
-{
-    v2_1,
-    v2_2 = 7
-};
-
-BOOST_DESCRIBE_ENUM_CLASS(E2, v2_1, v2_2);
-
-BOOST_DEFINE_ENUM(E3, v3_1, v3_2, v3_3);
-BOOST_DEFINE_FIXED_ENUM(E4, int, v4_1, v4_2, v4_3, v4_4);
-
-BOOST_DEFINE_ENUM_CLASS(E5, v5_1, v5_2, v5_3, v5_4, v5_5);
-BOOST_DEFINE_FIXED_ENUM_CLASS(E6, int, v6_1, v6_2, v6_3, v6_4, v6_5, v6_6);
-
 #include <boost/mp11.hpp>
 using namespace boost::mp11;
 
@@ -144,3 +154,4 @@ int main()
 }
 
 #endif // !defined(BOOST_DESCRIBE_CXX14)
+#endif // !defined(BOOST_DESCRIBE_CXX11)

test/members_test5.cpp

@@ -40,7 +40,7 @@ private:
     BOOST_DESCRIBE_CLASS(A2, (), (m1), (m2), (m3))
 };
 
-struct B: public A1, private A2
+class A3
 {
 public:
 
@@ -54,7 +54,24 @@ private:
 
     int m3;
 
-    BOOST_DESCRIBE_CLASS(B, (A1, A2), (m1), (m2), (m3))
+    BOOST_DESCRIBE_CLASS(A3, (), (m1), (m2), (m3))
+};
+
+struct B: public A1, protected A2, private A3
+{
+public:
+
+    int m1;
+
+protected:
+
+    int m2;
+
+private:
+
+    int m3;
+
+    BOOST_DESCRIBE_CLASS(B, (A1, A2, A3), (m1), (m2), (m3))
 };
 
 #if !defined(BOOST_DESCRIBE_CXX14)
@@ -93,50 +110,65 @@ int main()
     {
         using L = describe_members<B, mod_protected | mod_inherited | mod_hidden>;
 
-        BOOST_TEST_EQ( mp_size<L>::value, 2 );
+        BOOST_TEST_EQ( mp_size<L>::value, 4 );
 
         using D1 = mp_at_c<L, 0>;
         using D2 = mp_at_c<L, 1>;
+        using D3 = mp_at_c<L, 2>;
+        using D4 = mp_at_c<L, 3>;
 
         // BOOST_TEST( D1::pointer == &B::A1::m2 );
         BOOST_TEST_CSTR_EQ( D1::name, "m2" );
         BOOST_TEST_EQ( D1::modifiers, mod_protected | mod_inherited | mod_hidden );
 
-        // BOOST_TEST( D2::pointer == &B::m2 );
-        BOOST_TEST_CSTR_EQ( D2::name, "m2" );
-        BOOST_TEST_EQ( D2::modifiers, mod_protected );
+        // BOOST_TEST( D2::pointer == &B::A2::m1 );
+        BOOST_TEST_CSTR_EQ( D2::name, "m1" );
+        BOOST_TEST_EQ( D2::modifiers, mod_protected | mod_inherited | mod_hidden );
+
+        // BOOST_TEST( D3::pointer == &B::A2::m2 );
+        BOOST_TEST_CSTR_EQ( D3::name, "m2" );
+        BOOST_TEST_EQ( D3::modifiers, mod_protected | mod_inherited | mod_hidden );
+
+        // BOOST_TEST( D4::pointer == &B::m2 );
+        BOOST_TEST_CSTR_EQ( D4::name, "m2" );
+        BOOST_TEST_EQ( D4::modifiers, mod_protected );
     }
 
     {
         using L = describe_members<B, mod_private | mod_inherited | mod_hidden>;
 
-        BOOST_TEST_EQ( mp_size<L>::value, 5 );
+        BOOST_TEST_EQ( mp_size<L>::value, 6 );
 
         using D1 = mp_at_c<L, 0>;
         using D2 = mp_at_c<L, 1>;
         using D3 = mp_at_c<L, 2>;
         using D4 = mp_at_c<L, 3>;
         using D5 = mp_at_c<L, 4>;
+        using D6 = mp_at_c<L, 5>;
 
         // BOOST_TEST( D1::pointer == &B::A1::m3 );
         BOOST_TEST_CSTR_EQ( D1::name, "m3" );
         BOOST_TEST_EQ( D1::modifiers, mod_private | mod_inherited | mod_hidden );
 
-        // BOOST_TEST( D2::pointer == &B::A2::m1 );
-        BOOST_TEST_CSTR_EQ( D2::name, "m1" );
+        // BOOST_TEST( D2::pointer == &B::A2::m3 );
+        BOOST_TEST_CSTR_EQ( D2::name, "m3" );
         BOOST_TEST_EQ( D2::modifiers, mod_private | mod_inherited | mod_hidden );
 
-        // BOOST_TEST( D3::pointer == &B::A2::m2 );
-        BOOST_TEST_CSTR_EQ( D3::name, "m2" );
+        // BOOST_TEST( D3::pointer == &B::A3::m1 );
+        BOOST_TEST_CSTR_EQ( D3::name, "m1" );
         BOOST_TEST_EQ( D3::modifiers, mod_private | mod_inherited | mod_hidden );
 
-        // BOOST_TEST( D4::pointer == &B::A2::m3 );
-        BOOST_TEST_CSTR_EQ( D4::name, "m3" );
+        // BOOST_TEST( D4::pointer == &B::A3::m2 );
+        BOOST_TEST_CSTR_EQ( D4::name, "m2" );
         BOOST_TEST_EQ( D4::modifiers, mod_private | mod_inherited | mod_hidden );
 
-        // BOOST_TEST( D5::pointer == &B::m3 );
+        // BOOST_TEST( D5::pointer == &B::A3::m3 );
         BOOST_TEST_CSTR_EQ( D5::name, "m3" );
-        BOOST_TEST_EQ( D5::modifiers, mod_private );
+        BOOST_TEST_EQ( D5::modifiers, mod_private | mod_inherited | mod_hidden );
+
+        // BOOST_TEST( D6::pointer == &B::m3 );
+        BOOST_TEST_CSTR_EQ( D6::name, "m3" );
+        BOOST_TEST_EQ( D6::modifiers, mod_private );
     }
 
     return boost::report_errors();

test/nested_enum_test.cpp

@@ -0,0 +1,130 @@
+// Copyright 2020, 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/enumerators.hpp>
+#include <boost/describe/enum.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct X1
+{
+    enum E
+    {
+        v1 = 5
+    };
+
+    BOOST_DESCRIBE_NESTED_ENUM(E, v1)
+};
+
+class X2
+{
+private:
+
+    enum E
+    {
+        v1, v2
+    };
+
+    BOOST_DESCRIBE_NESTED_ENUM(E, v1, v2)
+
+public:
+
+    typedef E E2;
+};
+
+#if !defined(BOOST_DESCRIBE_CXX11)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++11 is not available")
+int main() {}
+
+#else
+
+struct X3
+{
+    enum class E
+    {
+        v1 = 7
+    };
+
+    BOOST_DESCRIBE_NESTED_ENUM(E, v1)
+};
+
+class X4
+{
+private:
+
+    enum class E
+    {
+        v1, v2
+    };
+
+    BOOST_DESCRIBE_NESTED_ENUM(E, v1, v2)
+
+public:
+
+    typedef E E2;
+};
+
+#if !defined(BOOST_DESCRIBE_CXX14)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++14 is not available")
+int main() {}
+
+#else
+
+#include <boost/mp11.hpp>
+using namespace boost::mp11;
+
+int main()
+{
+    {
+        using D = boost::describe::describe_enumerators<X1::E>;
+
+        BOOST_TEST_EQ( mp_size<D>::value, 1 );
+
+        BOOST_TEST_EQ( (mp_at_c<D, 0>::value), X1::v1 );
+        BOOST_TEST_CSTR_EQ( (mp_at_c<D, 0>::name), "v1" );
+    }
+
+    {
+        using D = boost::describe::describe_enumerators<X2::E2>;
+
+        BOOST_TEST_EQ( mp_size<D>::value, 2 );
+
+        BOOST_TEST_EQ( (mp_at_c<D, 0>::value), 0 );
+        BOOST_TEST_CSTR_EQ( (mp_at_c<D, 0>::name), "v1" );
+
+        BOOST_TEST_EQ( (mp_at_c<D, 1>::value), 1 );
+        BOOST_TEST_CSTR_EQ( (mp_at_c<D, 1>::name), "v2" );
+    }
+
+    {
+        using D = boost::describe::describe_enumerators<X3::E>;
+
+        BOOST_TEST_EQ( mp_size<D>::value, 1 );
+
+        BOOST_TEST_EQ( (int)(mp_at_c<D, 0>::value), (int)X3::E::v1 );
+        BOOST_TEST_CSTR_EQ( (mp_at_c<D, 0>::name), "v1" );
+    }
+
+    {
+        using D = boost::describe::describe_enumerators<X4::E2>;
+
+        BOOST_TEST_EQ( mp_size<D>::value, 2 );
+
+        BOOST_TEST_EQ( (int)(mp_at_c<D, 0>::value), 0 );
+        BOOST_TEST_CSTR_EQ( (mp_at_c<D, 0>::name), "v1" );
+
+        BOOST_TEST_EQ( (int)(mp_at_c<D, 1>::value), 1 );
+        BOOST_TEST_CSTR_EQ( (mp_at_c<D, 1>::name), "v2" );
+    }
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX14)
+#endif // !defined(BOOST_DESCRIBE_CXX11)

test/overloaded_test.cpp

@@ -0,0 +1,82 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/members.hpp>
+#include <boost/describe/class.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct X
+{
+    int f() { return 1; }
+    int f() const { return 2; }
+
+    static int f( int x ) { return x; }
+    static int f( int x, int y ) { return x + y; }
+};
+
+BOOST_DESCRIBE_STRUCT(X, (), (
+    (int ()) f,
+    (int () const) f,
+    (int (int)) f,
+    (int (int, int)) f
+))
+
+#if !defined(BOOST_DESCRIBE_CXX14)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++14 is not available")
+int main() {}
+
+#else
+
+#include <boost/mp11.hpp>
+
+int main()
+{
+    using namespace boost::describe;
+    using namespace boost::mp11;
+
+    {
+        using L = describe_members<X, mod_any_access | mod_function>;
+
+        BOOST_TEST_EQ( mp_size<L>::value, 2 );
+
+        using D1 = mp_at_c<L, 0>;
+        using D2 = mp_at_c<L, 1>;
+
+        X x;
+
+        BOOST_TEST_EQ( (x.*D1::pointer)(), 1 );
+        BOOST_TEST_CSTR_EQ( D1::name, "f" );
+        BOOST_TEST_EQ( D1::modifiers, mod_public | mod_function );
+
+        BOOST_TEST_EQ( (x.*D2::pointer)(), 2 );
+        BOOST_TEST_CSTR_EQ( D2::name, "f" );
+        BOOST_TEST_EQ( D2::modifiers, mod_public | mod_function );
+    }
+
+    {
+        using L = describe_members<X, mod_any_access | mod_static | mod_function>;
+
+        BOOST_TEST_EQ( mp_size<L>::value, 2 );
+
+        using D1 = mp_at_c<L, 0>;
+
+        using D1 = mp_at_c<L, 0>;
+        using D2 = mp_at_c<L, 1>;
+
+        BOOST_TEST_EQ( (*D1::pointer)( 3 ), 3 );
+        BOOST_TEST_CSTR_EQ( D1::name, "f" );
+        BOOST_TEST_EQ( D1::modifiers, mod_public | mod_static | mod_function );
+
+        BOOST_TEST_EQ( (*D2::pointer)( 4, 5 ), 9 );
+        BOOST_TEST_CSTR_EQ( D2::name, "f" );
+        BOOST_TEST_EQ( D2::modifiers, mod_public | mod_static | mod_function );
+    }
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX14)

test/overloaded_test2.cpp

@@ -0,0 +1,74 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/members.hpp>
+#include <boost/describe/class.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <utility>
+
+class X
+{
+private:
+
+    std::pair<int, int> p_;
+
+public:
+
+    std::pair<int, int>& f() { return p_; }
+    std::pair<int, int> const& f() const { return p_; }
+
+    BOOST_DESCRIBE_CLASS(X, (), ((std::pair<int, int>& ()) f, (std::pair<int, int> const& () const) f), (), (p_))
+};
+
+
+#if !defined(BOOST_DESCRIBE_CXX14)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++14 is not available")
+int main() {}
+
+#else
+
+#include <boost/mp11.hpp>
+
+int main()
+{
+    using namespace boost::describe;
+    using namespace boost::mp11;
+
+    {
+        using L1 = describe_members<X, mod_any_access>;
+
+        BOOST_TEST_EQ( mp_size<L1>::value, 1 );
+
+        using D1 = mp_at_c<L1, 0>;
+
+        BOOST_TEST_CSTR_EQ( D1::name, "p_" );
+        BOOST_TEST_EQ( D1::modifiers, mod_private );
+
+        X x;
+
+        auto& p = x.*D1::pointer;
+
+        using L2 = describe_members<X, mod_any_access | mod_function>;
+
+        BOOST_TEST_EQ( mp_size<L2>::value, 2 );
+
+        using D2 = mp_at_c<L2, 0>;
+        using D3 = mp_at_c<L2, 1>;
+
+        BOOST_TEST_EQ( &(x.*D2::pointer)(), &p );
+        BOOST_TEST_CSTR_EQ( D2::name, "f" );
+        BOOST_TEST_EQ( D2::modifiers, mod_public | mod_function );
+
+        BOOST_TEST_EQ( &(x.*D3::pointer)(), &p );
+        BOOST_TEST_CSTR_EQ( D3::name, "f" );
+        BOOST_TEST_EQ( D3::modifiers, mod_public | mod_function );
+    }
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX14)

test/pp_call_test.cpp

@@ -0,0 +1,43 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/detail/pp_utilities.hpp>
+#include <boost/describe/detail/config.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#if !defined(BOOST_DESCRIBE_CXX11)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++11 is not available")
+int main() {}
+
+#else
+
+#define S(x) S2(x)
+#define S2(x) S3(x)
+#define S3(x) #x
+
+#define F(a, x) (a, x)
+
+#if defined(_MSC_VER)
+# pragma warning(disable: 4003) // not enough arguments for macro invocation
+#endif
+
+char const * s1 = S(BOOST_DESCRIBE_PP_CALL(F, a, x));
+char const * s2 = "" S(BOOST_DESCRIBE_PP_CALL(F, a, ));
+char const * s3 = S(BOOST_DESCRIBE_PP_CALL(F, a, () x));
+char const * s4 = S(BOOST_DESCRIBE_PP_CALL(F, a, (b, c) x));
+
+int main()
+{
+    BOOST_TEST_CSTR_EQ( s1, "(a, x)" );
+    BOOST_TEST_CSTR_EQ( s2, "" );
+    BOOST_TEST_CSTR_EQ( s3, "(a, () x)" );
+    BOOST_TEST_CSTR_EQ( s4, "(a, (b, c) x)" );
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX11)

test/pp_is_empty_test.cpp

@@ -0,0 +1,40 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/detail/pp_utilities.hpp>
+#include <boost/describe/detail/config.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#if !defined(BOOST_DESCRIBE_CXX11)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++11 is not available")
+int main() {}
+
+#else
+
+#define S(x) S2(x)
+#define S2(x) #x
+
+#if defined(_MSC_VER)
+# pragma warning(disable: 4003) // not enough arguments for macro invocation
+#endif
+
+char const * s1 = S(BOOST_DESCRIBE_PP_IS_EMPTY());
+char const * s2 = S(BOOST_DESCRIBE_PP_IS_EMPTY(x));
+char const * s3 = S(BOOST_DESCRIBE_PP_IS_EMPTY(() x));
+char const * s4 = S(BOOST_DESCRIBE_PP_IS_EMPTY((a, b) x));
+
+int main()
+{
+    BOOST_TEST_CSTR_EQ( s1, "1" );
+    BOOST_TEST_CSTR_EQ( s2, "0" );
+    BOOST_TEST_CSTR_EQ( s3, "0" );
+    BOOST_TEST_CSTR_EQ( s4, "0" );
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX11)

test/pp_is_paren_test.cpp

@@ -0,0 +1,41 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/detail/pp_utilities.hpp>
+#include <boost/describe/detail/config.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#if !defined(BOOST_DESCRIBE_CXX11)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++11 is not available")
+int main() {}
+
+#else
+
+#define S(x) S2(x)
+#define S2(x) S3(x)
+#define S3(x) #x
+
+#if defined(_MSC_VER)
+# pragma warning(disable: 4003) // not enough arguments for macro invocation
+#endif
+
+char const * s1 = S(BOOST_DESCRIBE_PP_IS_PAREN());
+char const * s2 = S(BOOST_DESCRIBE_PP_IS_PAREN(x));
+char const * s3 = S(BOOST_DESCRIBE_PP_IS_PAREN(() x));
+char const * s4 = S(BOOST_DESCRIBE_PP_IS_PAREN((a, b) x));
+
+int main()
+{
+    BOOST_TEST_CSTR_EQ( s1, "0" );
+    BOOST_TEST_CSTR_EQ( s2, "0" );
+    BOOST_TEST_CSTR_EQ( s3, "1" );
+    BOOST_TEST_CSTR_EQ( s4, "1" );
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX11)

test/pp_name_test.cpp

@@ -0,0 +1,33 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/detail/pp_utilities.hpp>
+#include <boost/describe/detail/config.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#if !defined(BOOST_DESCRIBE_CXX11)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++11 is not available")
+int main() {}
+
+#else
+
+char const * s1 = BOOST_DESCRIBE_PP_NAME(x);
+char const * s2 = BOOST_DESCRIBE_PP_NAME(() y);
+char const * s3 = BOOST_DESCRIBE_PP_NAME((a) z);
+char const * s4 = BOOST_DESCRIBE_PP_NAME((a, b) w);
+
+int main()
+{
+    BOOST_TEST_CSTR_EQ( s1, "x" );
+    BOOST_TEST_CSTR_EQ( s2, "y" );
+    BOOST_TEST_CSTR_EQ( s3, "z" );
+    BOOST_TEST_CSTR_EQ( s4, "w" );
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX11)

test/pp_parse_test.cpp

@@ -0,0 +1,37 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/detail/pp_utilities.hpp>
+#include <boost/describe/detail/config.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#if !defined(BOOST_DESCRIBE_CXX11)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++11 is not available")
+int main() {}
+
+#else
+
+#define S(x) S2(x)
+#define S2(x) S3(x)
+#define S3(x) #x
+
+char const * s1 = S((BOOST_DESCRIBE_PP_PARSE(x)));
+char const * s2 = S((BOOST_DESCRIBE_PP_PARSE(() y)));
+char const * s3 = S((BOOST_DESCRIBE_PP_PARSE((a) z)));
+char const * s4 = S((BOOST_DESCRIBE_PP_PARSE((a, b) w)));
+
+int main()
+{
+    BOOST_TEST_CSTR_EQ( s1, "(0, ~, x)" );
+    BOOST_TEST_CSTR_EQ( s2, "(1, (), y)" );
+    BOOST_TEST_CSTR_EQ( s3, "(1, (a), z)" );
+    BOOST_TEST_CSTR_EQ( s4, "(1, (a, b), w)" );
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX11)

test/pp_pointer_test.cpp

@@ -0,0 +1,40 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/detail/pp_utilities.hpp>
+#include <boost/describe/detail/config.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#if !defined(BOOST_DESCRIBE_CXX11)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++11 is not available")
+int main() {}
+
+#else
+
+#define S(x) S2(x)
+#define S2(x) S3(x)
+#define S3(x) S4(x)
+#define S4(x) #x
+
+char const * s1 = S(BOOST_DESCRIBE_PP_POINTER(C1, x));
+char const * s2 = S((BOOST_DESCRIBE_PP_POINTER(C2, (R ()) y)));
+char const * s3 = S((BOOST_DESCRIBE_PP_POINTER(C3, (R () const) z)));
+char const * s4 = S((BOOST_DESCRIBE_PP_POINTER(C4, (R (A1)) v)));
+char const * s5 = S((BOOST_DESCRIBE_PP_POINTER(C5, (R (A1, A2) const &&) w)));
+
+int main()
+{
+    BOOST_TEST_CSTR_EQ( s1, "&C1::x" );
+    BOOST_TEST_CSTR_EQ( s2, "(::boost::describe::detail::mfn<C2, R ()>(&C2::y))" );
+    BOOST_TEST_CSTR_EQ( s3, "(::boost::describe::detail::mfn<C3, R () const>(&C3::z))" );
+    BOOST_TEST_CSTR_EQ( s4, "(::boost::describe::detail::mfn<C4, R (A1)>(&C4::v))" );
+    BOOST_TEST_CSTR_EQ( s5, "(::boost::describe::detail::mfn<C5, R (A1, A2) const &&>(&C5::w))" );
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX11)

test/struct_enum_fail.cpp

@@ -0,0 +1,16 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/enum.hpp>
+
+#if !defined(BOOST_DESCRIBE_CXX14)
+
+#error "Skipping test because C++14 is not available"
+
+#else
+
+struct X {};
+BOOST_DESCRIBE_ENUM(X)
+
+#endif // !defined(BOOST_DESCRIBE_CXX14)

test/test_d_type.cpp

@@ -0,0 +1,76 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/enum.hpp>
+#include <boost/describe/class.hpp>
+
+namespace N1
+{
+    enum D
+    {
+        d
+    };
+
+    BOOST_DESCRIBE_ENUM(D, d)
+}
+
+namespace N2
+{
+    enum E
+    {
+        D
+    };
+
+    BOOST_DESCRIBE_ENUM(E, D)
+}
+
+namespace N3
+{
+    struct D
+    {
+        int d;
+    };
+
+    BOOST_DESCRIBE_STRUCT(D, (), (d))
+}
+
+namespace N4
+{
+    struct E
+    {
+        int D;
+    };
+
+    BOOST_DESCRIBE_STRUCT(E, (), (D))
+}
+
+namespace N5
+{
+    class D
+    {
+        int d;
+        BOOST_DESCRIBE_CLASS(D, (), (), (), (d))
+    };
+}
+
+namespace N6
+{
+    struct D {};
+    struct E: D	{};
+    BOOST_DESCRIBE_STRUCT(E, (D), ())
+}
+
+namespace N7
+{
+    struct D {};
+    class E: D
+    {
+        int d;
+        BOOST_DESCRIBE_CLASS(E, (D), (), (), (d))
+    };
+}
+
+int main()
+{
+}

test/trailing_comma_test.cpp

@@ -0,0 +1,45 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/enumerators.hpp>
+#include <boost/describe/enum.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#if defined(_MSC_VER)
+# pragma warning(disable: 4003) // not enough arguments for macro invocation
+#endif
+
+enum E1 { a1, b1, c1, };
+BOOST_DESCRIBE_ENUM(E1, a1, b1, c1, )
+
+BOOST_DEFINE_ENUM(E2, a2, b2, c2, )
+
+#if !defined(BOOST_DESCRIBE_CXX14)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("Skipping test because C++14 is not available")
+int main() {}
+
+#else
+
+#include <boost/mp11.hpp>
+using namespace boost::mp11;
+
+int main()
+{
+    {
+        using D1 = boost::describe::describe_enumerators<E1>;
+        BOOST_TEST_EQ( mp_size<D1>::value, 3 );
+    }
+
+    {
+        using D2 = boost::describe::describe_enumerators<E2>;
+        BOOST_TEST_EQ( mp_size<D2>::value, 3 );
+    }
+
+    return boost::report_errors();
+}
+
+#endif // !defined(BOOST_DESCRIBE_CXX14)