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107 lines
3.3 KiB
107 lines
3.3 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at 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/fusion/support/config.hpp>
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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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// Special tags:
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struct iterator_facade_tag; // iterator facade tag
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struct boost_array_iterator_tag; // boost::array iterator tag
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struct mpl_iterator_tag; // mpl sequence iterator tag
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struct std_pair_iterator_tag; // std::pair iterator tag
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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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template <>
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struct equal_to_impl<iterator_facade_tag>
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{
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template <typename It1, typename It2, typename Tag1, typename Tag2>
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struct dispatch : mpl::false_ {};
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template <typename It1, typename It2, typename Tag>
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struct dispatch<It1, It2, Tag, Tag> // same tag
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: It1::template equal_to<It1, It2>
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{};
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template<typename It1, typename It2>
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struct apply : dispatch<It1, It2,
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typename It1::fusion_tag, typename It2::fusion_tag>
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{};
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};
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template <>
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struct equal_to_impl<boost_array_iterator_tag>;
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template <>
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struct equal_to_impl<mpl_iterator_tag>;
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template <>
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struct equal_to_impl<std_pair_iterator_tag>;
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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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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename
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boost::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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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename
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boost::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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