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3rdparty/boost_1_81_0/boost/context/detail/apply.hpp 2.07 KB
63e88f80   Hu Chunming   提交三方库
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  //          Copyright Oliver Kowalke 2014.
  // Distributed under the Boost Software License, Version 1.0.
  //    (See accompanying file LICENSE_1_0.txt or copy at
  //          http://www.boost.org/LICENSE_1_0.txt)
  
  #ifndef BOOST_CONTEXT_DETAIL_APPLY_H
  #define BOOST_CONTEXT_DETAIL_APPLY_H
  
  #include <functional>
  #include <tuple>
  #include <type_traits>
  #include <utility>
  
  #include <boost/config.hpp>
  
  #include <boost/context/detail/config.hpp>
  #if defined(BOOST_NO_CXX17_STD_INVOKE)
  #include <boost/context/detail/invoke.hpp>
  #endif
  #include <boost/context/detail/index_sequence.hpp>
  
  #ifdef BOOST_HAS_ABI_HEADERS
  # include BOOST_ABI_PREFIX
  #endif
  
  #if defined(BOOST_MSVC)
  # pragma warning(push)
  # pragma warning(disable: 4100)
  #endif
  
  namespace boost {
  namespace context {
  namespace detail {
  
  template< typename Fn, typename Tpl, std::size_t ... I >
  auto
  apply_impl( Fn && fn, Tpl && tpl, index_sequence< I ... >) 
  #if defined(BOOST_NO_CXX17_STD_INVOKE)
      -> decltype( boost::context::detail::invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... ) )
  #else
      -> decltype( std::invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... ) )
  #endif
  {
  #if defined(BOOST_NO_CXX17_STD_INVOKE)
      return boost::context::detail::invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... );
  #else
      return std::invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... );
  #endif
  }
  
  template< typename Fn, typename Tpl >
  auto
  apply( Fn && fn, Tpl && tpl) 
      -> decltype( apply_impl( std::forward< Fn >( fn),
                   std::forward< Tpl >( tpl),
                   make_index_sequence< std::tuple_size< typename std::decay< Tpl >::type >::value >{}) )
  {
      return apply_impl( std::forward< Fn >( fn),
                         std::forward< Tpl >( tpl),
                         make_index_sequence< std::tuple_size< typename std::decay< Tpl >::type >::value >{});
  }
  
  }}}
  
  #if defined(BOOST_MSVC)
  # pragma warning(pop)
  #endif
  
  #ifdef BOOST_HAS_ABI_HEADERS
  #include BOOST_ABI_SUFFIX
  #endif
  
  #endif // BOOST_CONTEXT_DETAIL_APPLY_H