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44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_DISTANCE_IMPL_09172005_0751)
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#define FUSION_DISTANCE_IMPL_09172005_0751
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#include <boost/fusion/support/config.hpp>
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#include <boost/mpl/minus.hpp>
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namespace boost { namespace fusion
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{
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struct vector_iterator_tag;
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namespace extension
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{
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template <typename Tag>
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struct distance_impl;
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template <>
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struct distance_impl<vector_iterator_tag>
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{
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template <typename First, typename Last>
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struct apply : mpl::minus<typename Last::index, typename First::index>
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{
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static typename mpl::minus<
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typename Last::index, typename First::index>::type
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call(First const&, Last const&)
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{
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typedef typename mpl::minus<
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typename Last::index, typename First::index>::type
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result;
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return result();
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}
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};
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};
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}
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}}
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#endif
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