ceph/src/boost/boost/beast/core/detail/in_place_init.hpp

   1 //
   2 // Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // Official repository: https://github.com/boostorg/beast
   8 //
   9
  10 #ifndef BOOST_BEAST_DETAIL_IN_PLACE_INIT_HPP
  11 #define BOOST_BEAST_DETAIL_IN_PLACE_INIT_HPP
  12
  13 #include <boost/version.hpp>
  14 #include <boost/optional/optional.hpp>
  15
  16 // Provide boost::in_place_init_t and boost::in_place_init
  17 // for Boost versions earlier than 1.63.0.
  18
  19 #if BOOST_VERSION < 106300
  20
  21 namespace boost {
  22
  23 namespace optional_ns {
  24
  25 // a tag for in-place initialization of contained value
  26 struct in_place_init_t
  27 {
  28   struct init_tag{};
  29   explicit in_place_init_t(init_tag){}
  30 };
  31 const in_place_init_t in_place_init ((in_place_init_t::init_tag()));
  32
  33 } // namespace optional_ns
  34
  35 using optional_ns::in_place_init_t;
  36 using optional_ns::in_place_init;
  37
  38 }
  39
  40 #endif
  41
  42 #endif
  43