1 /*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 ==============================================================================*/
7 #if !defined(FUSION_DISTANCE_IMPL_09172005_0751)
8 #define FUSION_DISTANCE_IMPL_09172005_0751
10 #include <boost/fusion/support/config.hpp>
11 #include <boost/mpl/minus.hpp>
13 namespace boost { namespace fusion
15 struct vector_iterator_tag;
19 template <typename Tag>
23 struct distance_impl<vector_iterator_tag>
25 template <typename First, typename Last>
26 struct apply : mpl::minus<typename Last::index, typename First::index>
28 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
29 static typename mpl::minus<
30 typename Last::index, typename First::index>::type
31 call(First const&, Last const&)
33 typedef typename mpl::minus<
34 typename Last::index, typename First::index>::type