89 lines
2.8 KiB
Plaintext
89 lines
2.8 KiB
Plaintext
/*=============================================================================
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Copyright (c) 2014 Kohei Takahashi
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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_BUILD_STD_TUPLE_05292014_0100)
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#define BOOST_FUSION_BUILD_STD_TUPLE_05292014_0100
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/detail/index_sequence.hpp>
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#include <boost/fusion/iterator/equal_to.hpp>
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#include <boost/fusion/iterator/next.hpp>
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#include <boost/fusion/iterator/value_of.hpp>
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#include <boost/fusion/iterator/deref.hpp>
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#include <tuple>
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#include <cstddef>
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namespace boost { namespace fusion { namespace detail
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{
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template <typename First, typename Last,
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bool is_empty = result_of::equal_to<First, Last>::value>
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struct build_std_tuple;
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template <typename First, typename Last>
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struct build_std_tuple<First, Last, true>
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{
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typedef std::tuple<> type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(First const&, Last const&)
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{
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return type();
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}
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};
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template <typename T, typename Rest>
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struct push_front_std_tuple;
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template <typename T, typename ...Rest>
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struct push_front_std_tuple<T, std::tuple<Rest...> >
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{
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typedef std::tuple<T, Rest...> type;
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template <std::size_t ...I>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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indexed_call(T const& first, std::tuple<Rest...> const& rest, index_sequence<I...>)
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{
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return type(first, std::get<I>(rest)...);
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(T const& first, std::tuple<Rest...> const& rest)
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{
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typedef typename make_index_sequence<sizeof...(Rest)>::type gen;
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return indexed_call(first, rest, gen());
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}
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};
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template <typename First, typename Last>
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struct build_std_tuple<First, Last, false>
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{
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typedef
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build_std_tuple<typename result_of::next<First>::type, Last>
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next_build_std_tuple;
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typedef push_front_std_tuple<
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typename result_of::value_of<First>::type
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, typename next_build_std_tuple::type>
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push_front;
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typedef typename push_front::type type;
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(First const& f, Last const& l)
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{
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typename result_of::value_of<First>::type v = *f;
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return push_front::call(
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v, next_build_std_tuple::call(fusion::next(f), l));
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}
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};
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}}}
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#endif
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