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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_DISTANCE_09172005_0721)
#define FUSION_DISTANCE_09172005_0721
#include <boost/fusion/iterator/detail/distance.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/fusion/support/tag_of.hpp>
namespace boost { namespace fusion
{
struct random_access_traversal_tag;
// 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 distance_impl
{
// default implementation
template <typename First, typename Last>
struct apply : distance_detail::linear_distance<First, Last>
{};
};
template <>
struct distance_impl<iterator_facade_tag>
{
template <typename First, typename Last>
struct apply : First::template distance<First, Last> {};
};
template <>
struct distance_impl<boost_array_iterator_tag>;
template <>
struct distance_impl<mpl_iterator_tag>;
template <>
struct distance_impl<std_pair_iterator_tag>;
}
namespace result_of
{
template <typename First, typename Last>
struct distance
: extension::distance_impl<typename detail::tag_of<First>::type>::
template apply<First, Last>
{
typedef typename extension::distance_impl<typename detail::tag_of<First>::type>::
template apply<First, Last>::type distance_application;
BOOST_STATIC_CONSTANT(int, value = distance_application::value);
};
}
template <typename First, typename Last>
inline typename result_of::distance<First, Last>::type
distance(First const& a, Last const& b)
{
return result_of::distance<First, Last>::call(a,b);
}
}}
#endif
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Swift