text: //
  // detail/reactive_wait_op.hpp
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
  //
  // 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 NET_TS_DETAIL_REACTIVE_WAIT_OP_HPP
  #define NET_TS_DETAIL_REACTIVE_WAIT_OP_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <experimental/__net_ts/detail/config.hpp>
  #include <experimental/__net_ts/detail/fenced_block.hpp>
  #include <experimental/__net_ts/detail/handler_alloc_helpers.hpp>
  #include <experimental/__net_ts/detail/handler_invoke_helpers.hpp>
  #include <experimental/__net_ts/detail/memory.hpp>
  #include <experimental/__net_ts/detail/reactor_op.hpp>
  
  #include <experimental/__net_ts/detail/push_options.hpp>
  
  namespace std {
  namespace experimental {
  namespace net {
  inline namespace v1 {
  namespace detail {
  
  template <typename Handler>
  class reactive_wait_op : public reactor_op
  {
  public:
    NET_TS_DEFINE_HANDLER_PTR(reactive_wait_op);
  
    reactive_wait_op(Handler& handler)
      : reactor_op(&reactive_wait_op::do_perform,
          &reactive_wait_op::do_complete),
        handler_(NET_TS_MOVE_CAST(Handler)(handler))
    {
      handler_work<Handler>::start(handler_);
    }
  
    static status do_perform(reactor_op*)
    {
      return done;
    }
  
    static void do_complete(void* owner, operation* base,
        const std::error_code& /*ec*/,
        std::size_t /*bytes_transferred*/)
    {
      // Take ownership of the handler object.
      reactive_wait_op* o(static_cast<reactive_wait_op*>(base));
      ptr p = { std::experimental::net::v1::detail::addressof(o->handler_), o, o };
      handler_work<Handler> w(o->handler_);
  
      NET_TS_HANDLER_COMPLETION((*o));
  
      // Make a copy of the handler so that the memory can be deallocated before
      // the upcall is made. Even if we're not about to make an upcall, a
      // sub-object of the handler may be the true owner of the memory associated
      // with the handler. Consequently, a local copy of the handler is required
      // to ensure that any owning sub-object remains valid until after we have
      // deallocated the memory here.
      detail::binder1<Handler, std::error_code>
        handler(o->handler_, o->ec_);
      p.h = std::experimental::net::v1::detail::addressof(handler.handler_);
      p.reset();
  
      // Make the upcall if required.
      if (owner)
      {
        fenced_block b(fenced_block::half);
        NET_TS_HANDLER_INVOCATION_BEGIN((handler.arg1_));
        w.complete(handler, handler.handler_);
        NET_TS_HANDLER_INVOCATION_END;
      }
    }
  
  private:
    Handler handler_;
  };
  
  } // namespace detail
  } // inline namespace v1
  } // namespace net
  } // namespace experimental
  } // namespace std
  
  #include <experimental/__net_ts/detail/pop_options.hpp>
  
  #endif // NET_TS_DETAIL_REACTIVE_WAIT_OP_HPP
  