author | Mike Kinghan <mikek@symbian.org> |
Tue, 13 Jul 2010 15:21:54 +0100 | |
changeset 24 | 936784880b21 |
parent 2 | 39c28ec933dd |
permissions | -rwxr-xr-x |
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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 = 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(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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