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75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
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// Copyright Oliver Kowalke 2014.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_CONTEXT_DETAIL_APPLY_H
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#define BOOST_CONTEXT_DETAIL_APPLY_H
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#include <functional>
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include <boost/config.hpp>
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#include <boost/context/detail/config.hpp>
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#if defined(BOOST_NO_CXX17_STD_INVOKE)
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#include <boost/context/detail/invoke.hpp>
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#endif
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#include <boost/context/detail/index_sequence.hpp>
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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#if defined(BOOST_MSVC)
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# pragma warning(push)
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# pragma warning(disable: 4100)
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#endif
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namespace boost {
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namespace context {
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namespace detail {
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template< typename Fn, typename Tpl, std::size_t ... I >
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auto
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apply_impl( Fn && fn, Tpl && tpl, index_sequence< I ... >)
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#if defined(BOOST_NO_CXX17_STD_INVOKE)
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-> decltype( invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... ) )
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#else
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-> decltype( std::invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... ) )
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#endif
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{
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#if defined(BOOST_NO_CXX17_STD_INVOKE)
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return invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... );
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#else
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return std::invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... );
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#endif
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}
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template< typename Fn, typename Tpl >
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auto
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apply( Fn && fn, Tpl && tpl)
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-> decltype( apply_impl( std::forward< Fn >( fn),
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std::forward< Tpl >( tpl),
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make_index_sequence< std::tuple_size< typename std::decay< Tpl >::type >::value >{}) )
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{
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return apply_impl( std::forward< Fn >( fn),
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std::forward< Tpl >( tpl),
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make_index_sequence< std::tuple_size< typename std::decay< Tpl >::type >::value >{});
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}
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}}}
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#if defined(BOOST_MSVC)
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# pragma warning(pop)
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#endif
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#ifdef BOOST_HAS_ABI_HEADERS
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#include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_CONTEXT_DETAIL_APPLY_H
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