/*============================================================================= | |
Copyright (c) 2001-2006 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/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> | |
{ | |
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 |