[857] | 1 |
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| 2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
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| 3 | // Howard Hinnant and John Maddock 2000.
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| 4 | // (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
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| 5 |
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| 6 | // Use, modification and distribution are subject to the Boost Software License,
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| 7 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 8 | // http://www.boost.org/LICENSE_1_0.txt).
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| 9 | //
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| 10 | // See http://www.boost.org/libs/type_traits for most recent version including documentation.
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| 11 |
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| 12 | // Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
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| 13 | // is_member_pointer based on the Simulated Partial Specialization work
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| 14 | // of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
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| 15 | // http://groups.yahoo.com/group/boost/message/5441
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| 16 | // Some workarounds in here use ideas suggested from "Generic<Programming>:
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| 17 | // Mappings between Types and Values"
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| 18 | // by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
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| 19 |
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| 20 |
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| 21 | #ifndef BOOST_TT_IS_SAME_HPP_INCLUDED
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| 22 | #define BOOST_TT_IS_SAME_HPP_INCLUDED
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| 23 |
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| 24 | #include "boost/type_traits/config.hpp"
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| 25 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 26 | #include "boost/type_traits/detail/yes_no_type.hpp"
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| 27 | #include "boost/type_traits/detail/ice_and.hpp"
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| 28 | #include "boost/type_traits/is_reference.hpp"
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| 29 | #endif
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| 30 | // should be the last #include
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| 31 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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| 32 |
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| 33 | namespace boost {
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| 34 |
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| 35 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 36 |
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| 37 | BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,false)
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| 38 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T,T,true)
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| 39 | #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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| 40 | // without this, Borland's compiler gives the wrong answer for
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| 41 | // references to arrays:
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| 42 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T&,T&,true)
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| 43 | #endif
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| 44 |
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| 45 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 46 |
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| 47 | namespace detail {
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| 48 |
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| 49 | #ifdef BOOST_MSVC
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| 50 | // the following VC6 specific implementation is *NOT* legal
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| 51 | // C++, but has the advantage that it works for incomplete
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| 52 | // types.
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| 53 |
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| 54 | template< typename T1 >
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| 55 | struct is_same_part_1
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| 56 | {
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| 57 | template<typename T2> struct part_2 { enum { value = false }; };
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| 58 | template<> struct part_2<T1> { enum { value = true }; };
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| 59 | };
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| 60 |
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| 61 | template< typename T1, typename T2 >
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| 62 | struct is_same_impl
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| 63 | {
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| 64 | enum { value = detail::is_same_part_1<T1>::template part_2<T2>::value };
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| 65 | };
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| 66 |
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| 67 | #else // generic "no-partial-specialization" version
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| 68 |
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| 69 | template <typename T>
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| 70 | ::boost::type_traits::yes_type
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| 71 | BOOST_TT_DECL is_same_tester(T*, T*);
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| 72 |
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| 73 | ::boost::type_traits::no_type
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| 74 | BOOST_TT_DECL is_same_tester(...);
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| 75 |
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| 76 | template <typename T, typename U>
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| 77 | struct is_same_impl
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| 78 | {
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| 79 | static T t;
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| 80 | static U u;
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| 81 |
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| 82 | BOOST_STATIC_CONSTANT(bool, value =
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| 83 | (::boost::type_traits::ice_and<
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| 84 | (sizeof(type_traits::yes_type) == sizeof(detail::is_same_tester(&t,&u))),
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| 85 | (::boost::is_reference<T>::value == ::boost::is_reference<U>::value),
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| 86 | (sizeof(T) == sizeof(U))
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| 87 | >::value));
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| 88 | };
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| 89 |
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| 90 | #endif // BOOST_MSVC
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| 91 |
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| 92 | } // namespace detail
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| 93 |
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| 94 | BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,(::boost::detail::is_same_impl<T,U>::value))
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| 95 |
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| 96 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 97 |
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| 98 | } // namespace boost
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| 99 |
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| 100 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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| 101 |
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| 102 | #endif // BOOST_TT_IS_SAME_HPP_INCLUDED
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| 103 |
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