ceph/src/boost/libs/fiber/include/boost/fiber/detail/convert.hpp

   1
   2 //          Copyright Oliver Kowalke 2013.
   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_FIBERS_DETAIL_CONVERT_H
   8 #define BOOST_FIBERS_DETAIL_CONVERT_H
   9
  10 #include <chrono>
  11 #include <memory>
  12
  13 #include <boost/config.hpp>
  14
  15 #include <boost/fiber/detail/config.hpp>
  16
  17 #ifdef BOOST_HAS_ABI_HEADERS
  18 #  include BOOST_ABI_PREFIX
  19 #endif
  20
  21 namespace boost {
  22 namespace fibers {
  23 namespace detail {
  24
  25 inline
  26 std::chrono::steady_clock::time_point convert(
  27         std::chrono::steady_clock::time_point const& timeout_time) noexcept {
  28     return timeout_time;
  29 }
  30
  31 template< typename Clock, typename Duration >
  32 std::chrono::steady_clock::time_point convert(
  33         std::chrono::time_point< Clock, Duration > const& timeout_time) {
  34     return std::chrono::steady_clock::now() + ( timeout_time - Clock::now() );
  35 }
  36
  37 // suggested by Howard Hinnant
  38 template< typename T >
  39 inline
  40 T * convert( T * p) noexcept {
  41     return p;
  42 }
  43
  44 template< typename Pointer >
  45 inline
  46 typename std::pointer_traits< Pointer >::element_type *
  47 convert( Pointer p) noexcept {
  48     return nullptr != p
  49         ? to_raw_pointer( p.operator->() )
  50         : nullptr;
  51 }
  52
  53 }}}
  54
  55 #ifdef BOOST_HAS_ABI_HEADERS
  56 #  include BOOST_ABI_SUFFIX
  57 #endif
  58
  59 #endif // BOOST_FIBERS_DETAIL_CONVERT_H