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- /*=============================================================================
- Copyright (c) 2001-2011 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
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