| |
| // (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 <ndnboost/type_traits/config.hpp> |
| #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| #include <ndnboost/type_traits/detail/yes_no_type.hpp> |
| #include <ndnboost/type_traits/detail/ice_and.hpp> |
| #include <ndnboost/type_traits/is_reference.hpp> |
| #endif |
| // should be the last #include |
| #include <ndnboost/type_traits/detail/bool_trait_def.hpp> |
| |
| namespace ndnboost { |
| |
| #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 = ndnboost::detail::is_same_part_1<T1>::template part_2<T2>::value }; |
| }; |
| |
| #else // generic "no-partial-specialization" version |
| |
| template <typename T> |
| ::ndnboost::type_traits::yes_type |
| BOOST_TT_DECL is_same_tester(T*, T*); |
| |
| ::ndnboost::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 = |
| (::ndnboost::type_traits::ice_and< |
| (sizeof(type_traits::yes_type) == sizeof(ndnboost::detail::is_same_tester(&t,&u))), |
| (::ndnboost::is_reference<T>::value == ::ndnboost::is_reference<U>::value), |
| (sizeof(T) == sizeof(U)) |
| >::value)); |
| }; |
| |
| #endif // BOOST_MSVC |
| |
| } // namespace detail |
| |
| BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,(::ndnboost::detail::is_same_impl<T,U>::value)) |
| |
| #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| |
| } // namespace ndnboost |
| |
| #include <ndnboost/type_traits/detail/bool_trait_undef.hpp> |
| |
| #endif // BOOST_TT_IS_SAME_HPP_INCLUDED |
| |