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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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