forked from boostorg/fusion
2114bfca6c
Note 1: Forwarding functions are specified as a C++14 constexpr since std::forward is not a constexpr within C++11. Note 2: Though I'm not sure why it doesn't compile, some declarations are specified as a C++14 constexpr or non-constexpr. Note 3: Boost.Tuple adaptation and TR1-based tuple implementations are not constexpr.
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
/*=============================================================================
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Copyright (c) 2009 Hartmut Kaiser
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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_NVIEW_DISTANCE_IMPL_SEP_23_2009_0328PM)
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#define BOOST_FUSION_NVIEW_DISTANCE_IMPL_SEP_23_2009_0328PM
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/iterator/distance.hpp>
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namespace boost { namespace fusion
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{
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struct nview_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<nview_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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: result_of::distance<typename First::first_type, typename Last::first_type>
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{
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typedef typename result_of::distance<
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typename First::first_type, typename Last::first_type
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>::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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