ceph/src/boost/libs/context/include/boost/context/detail/apply.hpp

   1
   2 //          Copyright Oliver Kowalke 2014.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_CONTEXT_DETAIL_APPLY_H
   8 #define BOOST_CONTEXT_DETAIL_APPLY_H
   9
  10 #include <functional>
  11 #include <tuple>
  12 #include <type_traits>
  13 #include <utility>
  14
  15 #include <boost/config.hpp>
  16
  17 #include <boost/context/detail/config.hpp>
  18 #include <boost/context/detail/invoke.hpp>
  19 #include <boost/context/detail/index_sequence.hpp>
  20
  21 #ifdef BOOST_HAS_ABI_HEADERS
  22 # include BOOST_ABI_PREFIX
  23 #endif
  24
  25 namespace boost {
  26 namespace context {
  27 namespace detail {
  28
  29 template< typename Fn, typename Tpl, std::size_t ... I >
  30 auto
  31 apply_impl( Fn && fn, Tpl && tpl, index_sequence< I ... >)
  32     -> decltype( invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... ) )
  33 {
  34     return invoke( std::forward< Fn >( fn), std::get< I >( std::forward< Tpl >( tpl) ) ... );
  35 }
  36
  37 template< typename Fn, typename Tpl >
  38 auto
  39 apply( Fn && fn, Tpl && tpl)
  40     -> decltype( apply_impl( std::forward< Fn >( fn),
  41                  std::forward< Tpl >( tpl),
  42                  make_index_sequence< std::tuple_size< typename std::decay< Tpl >::type >::value >{}) )
  43 {
  44     return apply_impl( std::forward< Fn >( fn),
  45                        std::forward< Tpl >( tpl),
  46                        make_index_sequence< std::tuple_size< typename std::decay< Tpl >::type >::value >{});
  47 }
  48
  49 }}}
  50
  51 #ifdef BOOST_HAS_ABI_HEADERS
  52 #include BOOST_ABI_SUFFIX
  53 #endif
  54
  55 #endif // BOOST_CONTEXT_DETAIL_APPLY_H