| /*============================================================================= |
| 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 |