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46 lines
1.4 KiB
46 lines
1.4 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2011 Eric Niebler
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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(BOOST_FUSION_SINGLE_VIEW_DISTANCE_IMPL_JUL_07_2011_1348PM)
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#define BOOST_FUSION_SINGLE_VIEW_DISTANCE_IMPL_JUL_07_2011_1348PM
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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 single_view_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<single_view_iterator_tag>
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{
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template<typename First, typename Last>
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struct apply
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: mpl::minus<typename Last::position, typename First::position>
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{
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typedef typename mpl::minus<typename Last::position,
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typename First::position>::type type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(First const& /*first*/, Last const& /*last*/)
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{
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return type();
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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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