Chris@16: //
Chris@16: // detail/reactive_null_buffers_op.hpp
Chris@16: // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chris@16: //
Chris@101: // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_ASIO_DETAIL_REACTIVE_NULL_BUFFERS_OP_HPP
Chris@16: #define BOOST_ASIO_DETAIL_REACTIVE_NULL_BUFFERS_OP_HPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: # pragma once
Chris@16: #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: 
Chris@16: #include <boost/asio/detail/config.hpp>
Chris@16: #include <boost/asio/detail/addressof.hpp>
Chris@16: #include <boost/asio/detail/fenced_block.hpp>
Chris@16: #include <boost/asio/detail/handler_alloc_helpers.hpp>
Chris@16: #include <boost/asio/detail/handler_invoke_helpers.hpp>
Chris@16: #include <boost/asio/detail/reactor_op.hpp>
Chris@16: 
Chris@16: #include <boost/asio/detail/push_options.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace asio {
Chris@16: namespace detail {
Chris@16: 
Chris@16: template <typename Handler>
Chris@16: class reactive_null_buffers_op : public reactor_op
Chris@16: {
Chris@16: public:
Chris@16:   BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_null_buffers_op);
Chris@16: 
Chris@16:   reactive_null_buffers_op(Handler& handler)
Chris@16:     : reactor_op(&reactive_null_buffers_op::do_perform,
Chris@16:         &reactive_null_buffers_op::do_complete),
Chris@16:       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
Chris@16:   {
Chris@16:   }
Chris@16: 
Chris@16:   static bool do_perform(reactor_op*)
Chris@16:   {
Chris@16:     return true;
Chris@16:   }
Chris@16: 
Chris@16:   static void do_complete(io_service_impl* owner, operation* base,
Chris@16:       const boost::system::error_code& /*ec*/,
Chris@16:       std::size_t /*bytes_transferred*/)
Chris@16:   {
Chris@16:     // Take ownership of the handler object.
Chris@16:     reactive_null_buffers_op* o(static_cast<reactive_null_buffers_op*>(base));
Chris@16:     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
Chris@16: 
Chris@16:     BOOST_ASIO_HANDLER_COMPLETION((o));
Chris@16: 
Chris@16:     // Make a copy of the handler so that the memory can be deallocated before
Chris@16:     // the upcall is made. Even if we're not about to make an upcall, a
Chris@16:     // sub-object of the handler may be the true owner of the memory associated
Chris@16:     // with the handler. Consequently, a local copy of the handler is required
Chris@16:     // to ensure that any owning sub-object remains valid until after we have
Chris@16:     // deallocated the memory here.
Chris@16:     detail::binder2<Handler, boost::system::error_code, std::size_t>
Chris@16:       handler(o->handler_, o->ec_, o->bytes_transferred_);
Chris@16:     p.h = boost::asio::detail::addressof(handler.handler_);
Chris@16:     p.reset();
Chris@16: 
Chris@16:     // Make the upcall if required.
Chris@16:     if (owner)
Chris@16:     {
Chris@16:       fenced_block b(fenced_block::half);
Chris@16:       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
Chris@16:       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
Chris@16:       BOOST_ASIO_HANDLER_INVOCATION_END;
Chris@16:     }
Chris@16:   }
Chris@16: 
Chris@16: private:
Chris@16:   Handler handler_;
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace asio
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/asio/detail/pop_options.hpp>
Chris@16: 
Chris@16: #endif // BOOST_ASIO_DETAIL_REACTIVE_NULL_BUFFERS_OP_HPP