text: 
  #ifndef BOOST_MPL_HAS_XXX_HPP_INCLUDED
  #define BOOST_MPL_HAS_XXX_HPP_INCLUDED
  
  // Copyright Aleksey Gurtovoy 2002-2006
  // Copyright David Abrahams 2002-2003
  // Copyright Daniel Walker 2007
  //
  // 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)
  //
  // See http://www.boost.org/libs/mpl for documentation.
  
  // $Id$
  // $Date$
  // $Revision$
  
  #include <boost/mpl/bool.hpp>
  #include <boost/mpl/aux_/na_spec.hpp>
  #include <boost/mpl/aux_/type_wrapper.hpp>
  #include <boost/mpl/aux_/yes_no.hpp>
  #include <boost/mpl/aux_/config/gcc.hpp>
  #include <boost/mpl/aux_/config/has_xxx.hpp>
  #include <boost/mpl/aux_/config/msvc_typename.hpp>
  #include <boost/mpl/aux_/config/msvc.hpp>
  #include <boost/mpl/aux_/config/static_constant.hpp>
  #include <boost/mpl/aux_/config/workaround.hpp>
  
  #include <boost/preprocessor/array/elem.hpp>
  #include <boost/preprocessor/cat.hpp>
  #include <boost/preprocessor/control/if.hpp>
  #include <boost/preprocessor/repetition/enum_params.hpp>
  #include <boost/preprocessor/repetition/enum_trailing_params.hpp>
  
  #if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x590) )
  # include <boost/type_traits/is_class.hpp>
  #endif
  
  #if !defined(BOOST_MPL_CFG_NO_HAS_XXX)
  
  #   if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
  
  // agurt, 11/sep/02: MSVC-specific version (< 7.1), based on a USENET 
  // newsgroup's posting by John Madsen (comp.lang.c++.moderated, 
  // 1999-11-12 19:17:06 GMT); the code is _not_ standard-conforming, but 
  // it works way more reliably than the SFINAE-based implementation
  
  // Modified dwa 8/Oct/02 to handle reference types.
  
  #   include <boost/mpl/if.hpp>
  #   include <boost/mpl/bool.hpp>
  
  namespace boost { namespace mpl { namespace aux {
  
  struct has_xxx_tag;
  
  #if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
  template< typename U > struct msvc_incomplete_array
  {
      typedef char (&type)[sizeof(U) + 1];
  };
  #endif
  
  template< typename T >
  struct msvc_is_incomplete
  {
      // MSVC is capable of some kinds of SFINAE.  If U is an incomplete
      // type, it won't pick the second overload
      static char tester(...);
  
  #if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
      template< typename U >
      static typename msvc_incomplete_array<U>::type tester(type_wrapper<U>);
  #else
      template< typename U >
      static char (& tester(type_wrapper<U>) )[sizeof(U)+1];
  #endif 
      
      BOOST_STATIC_CONSTANT(bool, value = 
            sizeof(tester(type_wrapper<T>())) == 1
          );
  };
  
  template<>
  struct msvc_is_incomplete<int>
  {
      BOOST_STATIC_CONSTANT(bool, value = false);
  };
  
  }}}
  
  #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, default_) \
  template< typename T, typename name = ::boost::mpl::aux::has_xxx_tag > \
  struct BOOST_PP_CAT(trait,_impl) : T \
  { \
      static boost::mpl::aux::no_tag \
      test(void(*)(::boost::mpl::aux::has_xxx_tag)); \
      \
      static boost::mpl::aux::yes_tag test(...); \
      \
      BOOST_STATIC_CONSTANT(bool, value = \
            sizeof(test(static_cast<void(*)(name)>(0))) \
              != sizeof(boost::mpl::aux::no_tag) \
          ); \
      typedef boost::mpl::bool_<value> type; \
  }; \
  \
  template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
  struct trait \
      : boost::mpl::if_c< \
            boost::mpl::aux::msvc_is_incomplete<T>::value \
          , boost::mpl::bool_<false> \
          , BOOST_PP_CAT(trait,_impl)<T> \
          >::type \
  { \
  }; \
  \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, void) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, bool) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, char) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed char) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned char) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed short) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned short) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed int) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned int) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed long) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned long) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, float) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, double) \
  BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, long double) \
  /**/
  
  #   define BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, T) \
  template<> struct trait<T> \
  { \
      BOOST_STATIC_CONSTANT(bool, value = false); \
      typedef boost::mpl::bool_<false> type; \
  }; \
  /**/
  
  #if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
  #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
      BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, unused) \
      BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, wchar_t) \
  /**/
  #else
  #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
      BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, unused) \
  /**/
  #endif
  
  
  // SFINAE-based implementations below are derived from a USENET newsgroup's 
  // posting by Rani Sharoni (comp.lang.c++.moderated, 2002-03-17 07:45:09 PST)
  
  #   elif BOOST_WORKAROUND(BOOST_MSVC, <= 1400) \
        || (BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1800)) && defined(__CUDACC__)) \
        || BOOST_WORKAROUND(__IBMCPP__, <= 700)
  
  // MSVC 7.1 & MSVC 8.0 & VACPP
  
  // agurt, 15/jun/05: replace overload-based SFINAE implementation with SFINAE
  // applied to partial specialization to fix some apparently random failures 
  // (thanks to Daniel Wallin for researching this!)
  
  #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
  template< typename T > \
  struct BOOST_PP_CAT(trait, _msvc_sfinae_helper) \
  { \
      typedef void type; \
  };\
  \
  template< typename T, typename U = void > \
  struct BOOST_PP_CAT(trait,_impl_) \
  { \
      BOOST_STATIC_CONSTANT(bool, value = false); \
      typedef boost::mpl::bool_<value> type; \
  }; \
  \
  template< typename T > \
  struct BOOST_PP_CAT(trait,_impl_)< \
        T \
      , typename BOOST_PP_CAT(trait, _msvc_sfinae_helper)< typename T::name >::type \
      > \
  { \
      BOOST_STATIC_CONSTANT(bool, value = true); \
      typedef boost::mpl::bool_<value> type; \
  }; \
  \
  template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
  struct trait \
      : BOOST_PP_CAT(trait,_impl_)<T> \
  { \
  }; \
  /**/
  
  #   elif BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x590) )
  
  #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_BCB_DEF(trait, trait_tester, name, default_) \
  template< typename T, bool IS_CLASS > \
  struct trait_tester \
  { \
      BOOST_STATIC_CONSTANT( bool,  value = false ); \
  }; \
  template< typename T > \
  struct trait_tester< T, true > \
  { \
      struct trait_tester_impl \
      { \
          template < class U > \
          static int  resolve( boost::mpl::aux::type_wrapper<U> const volatile * \
                             , boost::mpl::aux::type_wrapper<typename U::name >* = 0 ); \
          static char resolve( ... ); \
      }; \
      typedef boost::mpl::aux::type_wrapper<T> t_; \
      BOOST_STATIC_CONSTANT( bool, value = ( sizeof( trait_tester_impl::resolve( static_cast< t_ * >(0) ) ) == sizeof(int) ) ); \
  }; \
  template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
  struct trait           \
  {                      \
      BOOST_STATIC_CONSTANT( bool, value = (trait_tester< T, boost::is_class< T >::value >::value) );     \
      typedef boost::mpl::bool_< trait< T, fallback_ >::value > type; \
  };
  
  #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
      BOOST_MPL_HAS_XXX_TRAIT_NAMED_BCB_DEF( trait \
                                           , BOOST_PP_CAT(trait,_tester)      \
                                           , name       \
                                           , default_ ) \
  /**/
  
  #   else // other SFINAE-capable compilers
  
  #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
  template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
  struct trait \
  { \
      struct gcc_3_2_wknd \
      { \
          template< typename U > \
          static boost::mpl::aux::yes_tag test( \
                boost::mpl::aux::type_wrapper<U> const volatile* \
              , boost::mpl::aux::type_wrapper<BOOST_MSVC_TYPENAME U::name>* = 0 \
              ); \
      \
          static boost::mpl::aux::no_tag test(...); \
      }; \
      \
      typedef boost::mpl::aux::type_wrapper<T> t_; \
      BOOST_STATIC_CONSTANT(bool, value = \
            sizeof(gcc_3_2_wknd::test(static_cast<t_*>(0))) \
              == sizeof(boost::mpl::aux::yes_tag) \
          ); \
      typedef boost::mpl::bool_<value> type; \
  }; \
  /**/
  
  #   endif // BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
  
  
  #else // BOOST_MPL_CFG_NO_HAS_XXX
  
  // placeholder implementation
  
  #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
  template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
  struct trait \
  { \
      BOOST_STATIC_CONSTANT(bool, value = fallback_::value); \
      typedef fallback_ type; \
  }; \
  /**/
  
  #endif
  
  #define BOOST_MPL_HAS_XXX_TRAIT_DEF(name) \
      BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(BOOST_PP_CAT(has_,name), name, false) \
  /**/
  
  
  #if !defined(BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE)
  
  // Create a boolean Metafunction to detect a nested template
  // member. This implementation is based on a USENET newsgroup's
  // posting by Aleksey Gurtovoy (comp.lang.c++.moderated, 2002-03-19),
  // Rani Sharoni's USENET posting cited above, the non-template has_xxx
  // implementations above, and discussion on the Boost mailing list.
  
  #   if !defined(BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES)
  #     if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
  #       define BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES 1
  #     else
  #       define BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES 0
  #     endif
  #   endif
  
  #   if !defined(BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION)
  #     if (defined(BOOST_NO_EXPLICIT_FUNCTION_TEMPLATE_ARGUMENTS))
  #       define BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION 1
  #     else
  #       define BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION 0
  #     endif
  #   endif
  
  #   if !defined(BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE)
  #     if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
  #       define BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE 1
  #     else
  #       define BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE 0
  #     endif
  #   endif
  
  // NOTE: Many internal implementation macros take a Boost.Preprocessor
  // array argument called args which is of the following form.
  //           ( 4, ( trait, name, max_arity, default_ ) )
  
  #   define BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args) \
        BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _introspect) \
      /**/
  
  #   define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) \
        BOOST_PP_CAT(BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _substitute), n) \
      /**/
  
  #   define BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args) \
        BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _test) \
      /**/
  
  // Thanks to Guillaume Melquiond for pointing out the need for the
  // "substitute" template as an argument to the overloaded test
  // functions to get SFINAE to work for member templates with the
  // correct name but different number of arguments.
  #   define BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE(z, n, args) \
        template< \
            template< BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(n), typename V) > class V \
         > \
        struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) { \
        }; \
      /**/
  
  #   define BOOST_MPL_HAS_MEMBER_SUBSTITUTE(args, substitute_macro) \
        BOOST_PP_REPEAT( \
            BOOST_PP_ARRAY_ELEM(2, args) \
          , BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE \
          , args \
        ) \
      /**/
  
  #   if !BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION
  #     define BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
          template< typename V > \
          static boost::mpl::aux::no_tag \
          BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)(...); \
        /**/
  #   else
  #     define BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
          static boost::mpl::aux::no_tag \
          BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)(...); \
        /**/
  #   endif
  
  #   if !BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES
  #     define BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT(z, n, args) \
          template< typename V > \
          static boost::mpl::aux::yes_tag \
          BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
              boost::mpl::aux::type_wrapper< V > const volatile* \
            , BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) < \
                  V::template BOOST_PP_ARRAY_ELEM(1, args) \
              >* = 0 \
          ); \
        /**/
  #     define BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
          BOOST_PP_REPEAT( \
              BOOST_PP_ARRAY_ELEM(2, args) \
            , BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT \
            , args \
          ) \
        /**/
  #   else
  #     define BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
          template< typename V > \
          static boost::mpl::aux::yes_tag \
          BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
              V const volatile* \
            , member_macro(args, V, T)* = 0 \
          ); \
        /**/
  #   endif
  
  #   if !BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION
  #     define BOOST_MPL_HAS_MEMBER_TEST(args) \
            sizeof(BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)< U >(0)) \
                == sizeof(boost::mpl::aux::yes_tag) \
        /**/
  #   else
  #     if !BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES
  #       define BOOST_MPL_HAS_MEMBER_TEST(args) \
            sizeof( \
                BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
                    static_cast< boost::mpl::aux::type_wrapper< U >* >(0) \
                ) \
            ) == sizeof(boost::mpl::aux::yes_tag) \
          /**/
  #     else
  #       define BOOST_MPL_HAS_MEMBER_TEST(args) \
            sizeof( \
                BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
                    static_cast< U* >(0) \
                ) \
            ) == sizeof(boost::mpl::aux::yes_tag) \
          /**/
  #     endif
  #   endif
  
  #   define BOOST_MPL_HAS_MEMBER_INTROSPECT( \
                 args, substitute_macro, member_macro \
             ) \
        template< typename U > \
        struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args) { \
            BOOST_MPL_HAS_MEMBER_SUBSTITUTE(args, substitute_macro) \
            BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
            BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
            BOOST_STATIC_CONSTANT( \
                bool, value = BOOST_MPL_HAS_MEMBER_TEST(args) \
            ); \
            typedef boost::mpl::bool_< value > type; \
        }; \
      /**/
  
  #   define BOOST_MPL_HAS_MEMBER_IMPLEMENTATION( \
                 args, introspect_macro, substitute_macro, member_macro \
             ) \
        template< \
            typename T \
          , typename fallback_ \
                = boost::mpl::bool_< BOOST_PP_ARRAY_ELEM(3, args) > \
        > \
        class BOOST_PP_ARRAY_ELEM(0, args) { \
            introspect_macro(args, substitute_macro, member_macro) \
        public: \
            static const bool value \
                = BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args)< T >::value; \
            typedef typename BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args)< \
                T \
            >::type type; \
        }; \
      /**/
  
  // BOOST_MPL_HAS_MEMBER_WITH_FUNCTION_SFINAE expands to the full
  // implementation of the function-based metafunction. Compile with -E
  // to see the preprocessor output for this macro.
  #   define BOOST_MPL_HAS_MEMBER_WITH_FUNCTION_SFINAE( \
                 args, substitute_macro, member_macro \
             ) \
        BOOST_MPL_HAS_MEMBER_IMPLEMENTATION( \
            args \
          , BOOST_MPL_HAS_MEMBER_INTROSPECT \
          , substitute_macro \
          , member_macro \
        ) \
      /**/
  
  #   if BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE
  
  #     if !defined(BOOST_MPL_HAS_XXX_NEEDS_NAMESPACE_LEVEL_SUBSTITUTE)
  #       if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
  #         define BOOST_MPL_HAS_XXX_NEEDS_NAMESPACE_LEVEL_SUBSTITUTE 1
  #       endif
  #     endif
  
  #     if !BOOST_MPL_HAS_XXX_NEEDS_NAMESPACE_LEVEL_SUBSTITUTE
  #       define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
                     args, n \
                 ) \
            BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) \
          /**/
  #     else
  #       define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
                     args, n \
                 ) \
            BOOST_PP_CAT( \
                boost_mpl_has_xxx_ \
              , BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) \
            ) \
          /**/
  #     endif
  
  #     define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_TAG_NAME( \
                   args \
               ) \
          BOOST_PP_CAT( \
              BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
                  args, 0 \
              ) \
            , _tag \
          ) \
        /**/
  
  #     define BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE_WITH_TEMPLATE_SFINAE( \
                   z, n, args \
               ) \
          template< \
               template< BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(n), typename U) > class U \
          > \
          struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
                  args, n \
                 ) { \
              typedef \
                  BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_TAG_NAME(args) \
                  type; \
          }; \
        /**/
  
  #     define BOOST_MPL_HAS_MEMBER_SUBSTITUTE_WITH_TEMPLATE_SFINAE( \
                   args, substitute_macro \
               ) \
          typedef void \
              BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_TAG_NAME(args); \
          BOOST_PP_REPEAT( \
              BOOST_PP_ARRAY_ELEM(2, args) \
            , BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE_WITH_TEMPLATE_SFINAE \
            , args \
          ) \
        /**/
  
  #     define BOOST_MPL_HAS_MEMBER_REJECT_WITH_TEMPLATE_SFINAE( \
                   args, member_macro \
               ) \
          template< \
              typename U \
            , typename V \
                  = BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_TAG_NAME(args) \
          > \
          struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args) { \
              BOOST_STATIC_CONSTANT(bool, value = false); \
              typedef boost::mpl::bool_< value > type; \
          }; \
        /**/
  
  #     define BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT_WITH_TEMPLATE_SFINAE( \
                   z, n, args \
               ) \
          template< typename U > \
          struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)< \
              U \
            , typename \
                  BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
                      args, n \
                  )< \
                      BOOST_MSVC_TYPENAME U::BOOST_PP_ARRAY_ELEM(1, args)< > \
                  >::type \
          > { \
              BOOST_STATIC_CONSTANT(bool, value = true); \
              typedef boost::mpl::bool_< value > type; \
          }; \
        /**/
  
  #     define BOOST_MPL_HAS_MEMBER_ACCEPT_WITH_TEMPLATE_SFINAE( \
                   args, member_macro \
               ) \
          BOOST_PP_REPEAT( \
              BOOST_PP_ARRAY_ELEM(2, args) \
            , BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT_WITH_TEMPLATE_SFINAE \
            , args \
          ) \
        /**/
  
  #     define BOOST_MPL_HAS_MEMBER_INTROSPECT_WITH_TEMPLATE_SFINAE( \
                   args, substitute_macro, member_macro \
               ) \
          BOOST_MPL_HAS_MEMBER_REJECT_WITH_TEMPLATE_SFINAE(args, member_macro) \
          BOOST_MPL_HAS_MEMBER_ACCEPT_WITH_TEMPLATE_SFINAE(args, member_macro) \
          template< typename U > \
          struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args) \
              : BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)< U > { \
          }; \
        /**/
   
  // BOOST_MPL_HAS_MEMBER_WITH_TEMPLATE_SFINAE expands to the full
  // implementation of the template-based metafunction. Compile with -E
  // to see the preprocessor output for this macro.
  //
  // Note that if BOOST_MPL_HAS_XXX_NEEDS_NAMESPACE_LEVEL_SUBSTITUTE is
  // defined BOOST_MPL_HAS_MEMBER_SUBSTITUTE_WITH_TEMPLATE_SFINAE needs
  // to be expanded at namespace level before
  // BOOST_MPL_HAS_MEMBER_WITH_TEMPLATE_SFINAE can be used.
  #     define BOOST_MPL_HAS_MEMBER_WITH_TEMPLATE_SFINAE( \
                   args, substitute_macro, member_macro \
               ) \
          BOOST_MPL_HAS_MEMBER_SUBSTITUTE_WITH_TEMPLATE_SFINAE( \
              args, substitute_macro \
          ) \
          BOOST_MPL_HAS_MEMBER_IMPLEMENTATION( \
              args \
            , BOOST_MPL_HAS_MEMBER_INTROSPECT_WITH_TEMPLATE_SFINAE \
            , substitute_macro \
            , member_macro \
          ) \
        /**/
  
  #   endif // BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE
  
  // Note: In the current implementation the parameter and access macros
  // are no longer expanded.
  #   if !BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
  #     define BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF(trait, name, default_) \
          BOOST_MPL_HAS_MEMBER_WITH_FUNCTION_SFINAE( \
              ( 4, ( trait, name, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, default_ ) ) \
            , BOOST_MPL_HAS_MEMBER_TEMPLATE_SUBSTITUTE_PARAMETER \
            , BOOST_MPL_HAS_MEMBER_TEMPLATE_ACCESS \
          ) \
        /**/
  #   else
  #     define BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF(trait, name, default_) \
          BOOST_MPL_HAS_MEMBER_WITH_TEMPLATE_SFINAE( \
              ( 4, ( trait, name, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, default_ ) ) \
            , BOOST_MPL_HAS_MEMBER_TEMPLATE_SUBSTITUTE_PARAMETER \
            , BOOST_MPL_HAS_MEMBER_TEMPLATE_ACCESS \
          ) \
        /**/
  #   endif
  
  #else // BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE
  
  // placeholder implementation
  
  #   define BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF(trait, name, default_) \
        template< typename T \
                , typename fallback_ = boost::mpl::bool_< default_ > > \
        struct trait { \
            BOOST_STATIC_CONSTANT(bool, value = fallback_::value); \
            typedef fallback_ type; \
        }; \
      /**/
  
  #endif // BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE
  
  #   define BOOST_MPL_HAS_XXX_TEMPLATE_DEF(name) \
        BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF( \
            BOOST_PP_CAT(has_, name), name, false \
        ) \
      /**/
  
  #endif // BOOST_MPL_HAS_XXX_HPP_INCLUDED
  