//  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, 

 //      Howard Hinnant and John Maddock 2000. 

 //  (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001

 //  Use, modification and distribution are subject to 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/type_traits for most recent version including documentation.

 //    Fixed is_pointer, is_reference, is_const, is_volatile, is_same, 

 //    is_member_pointer based on the Simulated Partial Specialization work 

 //    of Mat Marcus and Jesse Jones. See  http://opensource.adobe.com or 

 //    http://groups.yahoo.com/group/boost/message/5441 

 //    Some workarounds in here use ideas suggested from "Generic<Programming>: 

 //    Mappings between Types and Values" 

 //    by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).

 #ifndef BOOST_TT_IS_SAME_HPP_INCLUDED

 #define BOOST_TT_IS_SAME_HPP_INCLUDED

 #include <boost/type_traits/config.hpp>

 #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

 #include <boost/type_traits/detail/yes_no_type.hpp>

 #include <boost/type_traits/detail/ice_and.hpp>

 #include <boost/type_traits/is_reference.hpp>

 #endif

 // should be the last #include

 #include <boost/type_traits/detail/bool_trait_def.hpp>

 namespace boost {

 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

 BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,false)

 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T,T,true)

 #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)

 // without this, Borland's compiler gives the wrong answer for

 // references to arrays:

 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T&,T&,true)

 #endif

 #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

 namespace detail {

 #ifdef BOOST_MSVC

 // the following VC6 specific implementation is *NOT* legal

 // C++, but has the advantage that it works for incomplete

 // types.

 template< typename T1 >

 struct is_same_part_1

 {

     template<typename T2>  struct part_2     { enum { value = false }; };

     template<>             struct part_2<T1> { enum { value = true }; };

 };

 template< typename T1, typename T2 >

 struct is_same_impl

 {

     enum { value = detail::is_same_part_1<T1>::template part_2<T2>::value };

 };

 #else // generic "no-partial-specialization" version

 template <typename T>

 ::boost::type_traits::yes_type

 BOOST_TT_DECL is_same_tester(T*, T*);

 ::boost::type_traits::no_type

 BOOST_TT_DECL is_same_tester(...);

 template <typename T, typename U>

 struct is_same_impl

 {

    static T t;

    static U u;

    BOOST_STATIC_CONSTANT(bool, value =

       (::boost::type_traits::ice_and<

          (sizeof(type_traits::yes_type) == sizeof(detail::is_same_tester(&t,&u))),

          (::boost::is_reference<T>::value == ::boost::is_reference<U>::value),

          (sizeof(T) == sizeof(U))

         >::value));

 };

 #endif // BOOST_MSVC

 } // namespace detail

 BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,(::boost::detail::is_same_impl<T,U>::value))

 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

 } // namespace boost

 #include <boost/type_traits/detail/bool_trait_undef.hpp>

 #endif  // BOOST_TT_IS_SAME_HPP_INCLUDED