104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
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// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
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// Howard Hinnant and John Maddock 2000.
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// (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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//
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// See http://www.boost.org/libs/type_traits for most recent version including documentation.
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// Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
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// is_member_pointer based on the Simulated Partial Specialization work
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// of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
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// http://groups.yahoo.com/group/boost/message/5441
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// Some workarounds in here use ideas suggested from "Generic<Programming>:
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// Mappings between Types and Values"
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// by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
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#ifndef BOOST_TT_IS_SAME_HPP_INCLUDED
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#define BOOST_TT_IS_SAME_HPP_INCLUDED
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#include <boost/type_traits/config.hpp>
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#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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#include <boost/type_traits/detail/yes_no_type.hpp>
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#include <boost/type_traits/detail/ice_and.hpp>
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#include <boost/type_traits/is_reference.hpp>
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#endif
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// should be the last #include
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#include <boost/type_traits/detail/bool_trait_def.hpp>
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namespace boost {
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T,T,true)
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#if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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// without this, Borland's compiler gives the wrong answer for
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// references to arrays:
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T&,T&,true)
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#endif
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#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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namespace detail {
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#ifdef BOOST_MSVC
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// the following VC6 specific implementation is *NOT* legal
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// C++, but has the advantage that it works for incomplete
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// types.
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template< typename T1 >
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struct is_same_part_1
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{
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template<typename T2> struct part_2 { enum { value = false }; };
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template<> struct part_2<T1> { enum { value = true }; };
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};
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template< typename T1, typename T2 >
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struct is_same_impl
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{
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enum { value = boost::detail::is_same_part_1<T1>::template part_2<T2>::value };
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};
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#else // generic "no-partial-specialization" version
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template <typename T>
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::boost::type_traits::yes_type
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BOOST_TT_DECL is_same_tester(T*, T*);
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::boost::type_traits::no_type
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BOOST_TT_DECL is_same_tester(...);
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template <typename T, typename U>
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struct is_same_impl
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{
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static T t;
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static U u;
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BOOST_STATIC_CONSTANT(bool, value =
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(::boost::type_traits::ice_and<
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(sizeof(type_traits::yes_type) == sizeof(boost::detail::is_same_tester(&t,&u))),
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(::boost::is_reference<T>::value == ::boost::is_reference<U>::value),
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(sizeof(T) == sizeof(U))
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>::value));
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};
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#endif // BOOST_MSVC
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} // namespace detail
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BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,(::boost::detail::is_same_impl<T,U>::value))
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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} // namespace boost
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#include <boost/type_traits/detail/bool_trait_undef.hpp>
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#endif // BOOST_TT_IS_SAME_HPP_INCLUDED
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