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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_IMPL_09172005_0751)
#define FUSION_DISTANCE_IMPL_09172005_0751
#include <boost/fusion/support/config.hpp>
#include <boost/mpl/minus.hpp>
namespace boost { namespace fusion
{
struct vector_iterator_tag;
namespace extension
{
template <typename Tag>
struct distance_impl;
template <>
struct distance_impl<vector_iterator_tag>
{
template <typename First, typename Last>
struct apply : mpl::minus<typename Last::index, typename First::index>
{
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static typename mpl::minus<
typename Last::index, typename First::index>::type
call(First const&, Last const&)
{
typedef typename mpl::minus<
typename Last::index, typename First::index>::type
result;
return result();
}
};
};
}
}}
#endif
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