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/*=============================================================================
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_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_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
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