/*============================================================================= Copyright (c) 2001-2011 Joel de Guzman Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) ==============================================================================*/ #if !defined(FUSION_EQUAL_TO_05052005_1208) #define FUSION_EQUAL_TO_05052005_1208 #include <boost/fusion/support/config.hpp> #include <boost/type_traits/is_same.hpp> #include <boost/fusion/support/tag_of.hpp> #include <boost/type_traits/add_const.hpp> #include <boost/fusion/support/is_iterator.hpp> #include <boost/mpl/and.hpp> #include <boost/utility/enable_if.hpp> namespace boost { namespace fusion { // Special tags: struct iterator_facade_tag; // iterator facade tag struct boost_array_iterator_tag; // boost::array iterator tag struct mpl_iterator_tag; // mpl sequence iterator tag struct std_pair_iterator_tag; // std::pair iterator tag namespace extension { template <typename Tag> struct equal_to_impl { // default implementation template <typename I1, typename I2> struct apply : is_same<typename add_const<I1>::type, typename add_const<I2>::type> {}; }; template <> struct equal_to_impl<iterator_facade_tag> { template <typename It1, typename It2, typename Tag1, typename Tag2> struct dispatch : mpl::false_ {}; template <typename It1, typename It2, typename Tag> struct dispatch<It1, It2, Tag, Tag> // same tag : It1::template equal_to<It1, It2> {}; template<typename It1, typename It2> struct apply : dispatch<It1, It2, typename It1::fusion_tag, typename It2::fusion_tag> {}; }; template <> struct equal_to_impl<boost_array_iterator_tag>; template <> struct equal_to_impl<mpl_iterator_tag>; template <> struct equal_to_impl<std_pair_iterator_tag>; } namespace result_of { template <typename I1, typename I2> struct equal_to : extension::equal_to_impl<typename detail::tag_of<I1>::type>:: template apply<I1, I2> {}; } namespace iterator_operators { template <typename Iter1, typename Iter2> BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED inline typename boost::enable_if< mpl::and_<is_fusion_iterator<Iter1>, is_fusion_iterator<Iter2> > , bool >::type operator==(Iter1 const&, Iter2 const&) { return result_of::equal_to<Iter1, Iter2>::value; } template <typename Iter1, typename Iter2> BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED inline typename boost::enable_if< mpl::and_<is_fusion_iterator<Iter1>, is_fusion_iterator<Iter2> > , bool >::type operator!=(Iter1 const&, Iter2 const&) { return !result_of::equal_to<Iter1, Iter2>::value; } } using iterator_operators::operator==; using iterator_operators::operator!=; }} #endif