118 lines
3.6 KiB
C++
118 lines
3.6 KiB
C++
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/*=============================================================================
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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_CONVERT_MAIN_09232005_1340)
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#define FUSION_CONVERT_MAIN_09232005_1340
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/container/map/map.hpp>
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namespace boost { namespace fusion { namespace detail
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{
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template <typename It, bool is_assoc>
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struct pair_from
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{
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typedef typename result_of::value_of<It>::type type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline type call(It const& it)
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{
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return *it;
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}
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};
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template <typename It>
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struct pair_from<It, true>
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{
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typedef typename result_of::key_of<It>::type key_type;
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typedef typename result_of::value_of_data<It>::type data_type;
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typedef typename fusion::pair<key_type, data_type> type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline type call(It const& it)
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{
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return type(deref_data(it));
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}
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};
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}}}
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///////////////////////////////////////////////////////////////////////////////
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// Without variadics, we will use the PP version
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///////////////////////////////////////////////////////////////////////////////
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#if !defined(BOOST_FUSION_HAS_VARIADIC_MAP)
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# include <boost/fusion/container/map/detail/cpp03/convert.hpp>
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#else
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///////////////////////////////////////////////////////////////////////////////
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// C++11 variadic implementation
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/fusion/container/map/detail/build_map.hpp>
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namespace boost { namespace fusion
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{
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namespace result_of
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{
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template <typename Sequence>
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struct as_map :
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detail::build_map<
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typename result_of::begin<Sequence>::type
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, typename result_of::end<Sequence>::type
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, is_base_of<
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associative_tag
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, typename traits::category_of<Sequence>::type>::value
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>
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{
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};
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}
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template <typename Sequence>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::as_map<Sequence>::type
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as_map(Sequence& seq)
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{
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typedef result_of::as_map<Sequence> gen;
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return gen::call(fusion::begin(seq), fusion::end(seq));
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}
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template <typename Sequence>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::as_map<Sequence const>::type
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as_map(Sequence const& seq)
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{
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typedef result_of::as_map<Sequence const> gen;
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return gen::call(fusion::begin(seq), fusion::end(seq));
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}
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namespace extension
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{
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template <typename T>
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struct convert_impl;
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template <>
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struct convert_impl<map_tag>
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{
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template <typename Sequence>
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struct apply
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{
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typedef typename
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result_of::as_map<Sequence>::type
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type call(Sequence& seq)
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{
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typedef result_of::as_map<Sequence> gen;
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return gen::call(fusion::begin(seq), fusion::end(seq));
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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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#endif
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