forked from boostorg/fusion
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
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/*=============================================================================
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Copyright (c) 2001-2006 Joel de Guzman
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Use, modification and distribution is subject to the Boost Software
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License, 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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#if !defined(FUSION_EQUAL_TO_05052005_1208)
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#define FUSION_EQUAL_TO_05052005_1208
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#include <boost/type_traits/is_same.hpp>
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#include <boost/fusion/support/tag_of.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/fusion/support/is_iterator.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace fusion
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{
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namespace extension
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{
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template <typename Tag>
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struct equal_to_impl
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{
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// default implementation
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template <typename I1, typename I2>
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struct apply
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: is_same<typename add_const<I1>::type, typename add_const<I2>::type>
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{};
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};
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}
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namespace result_of
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{
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template <typename I1, typename I2>
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struct equal_to
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: extension::equal_to_impl<typename detail::tag_of<I1>::type>::
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template apply<I1, I2>
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{};
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}
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namespace iterator_operators
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{
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template <typename Iter1, typename Iter2>
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inline typename
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enable_if<
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mpl::and_<is_fusion_iterator<Iter1>, is_fusion_iterator<Iter2> >
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, bool
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>::type
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operator==(Iter1 const&, Iter2 const&)
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{
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return result_of::equal_to<Iter1, Iter2>::value;
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}
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template <typename Iter1, typename Iter2>
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inline typename
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enable_if<
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mpl::and_<is_fusion_iterator<Iter1>, is_fusion_iterator<Iter2> >
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, bool
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>::type
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operator!=(Iter1 const&, Iter2 const&)
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{
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return !result_of::equal_to<Iter1, Iter2>::value;
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}
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}
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using iterator_operators::operator==;
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using iterator_operators::operator!=;
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}}
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#endif
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