| /*============================================================================= |
| Copyright (c) 2001-2006 Joel de Guzman |
| Copyright (c) 2006 Dan Marsden |
| |
| 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(BOOST_FUSION_DISTANCE_IMPL_20060223_0814) |
| #define BOOST_FUSION_DISTANCE_IMPL_20060223_0814 |
| |
| #include <boost/mpl/minus.hpp> |
| |
| namespace example |
| { |
| struct example_struct_iterator_tag; |
| } |
| |
| namespace boost { namespace fusion { |
| |
| namespace extension |
| { |
| template<typename Tag> |
| struct distance_impl; |
| |
| template<> |
| struct distance_impl<example::example_struct_iterator_tag> |
| { |
| template<typename First, typename Last> |
| struct apply |
| : mpl::minus<typename Last::index, typename First::index> |
| { |
| typedef apply<First, Last> self; |
| |
| static typename self::type |
| call(First const& first, Last const& last) |
| { |
| return typename self::type(); |
| } |
| }; |
| }; |
| } |
| }} |
| |
| #endif |