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//
// null_buffers_op.hpp
// ~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 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 BOOST_ASIO_DETAIL_NULL_BUFFERS_OP_HPP
#define BOOST_ASIO_DETAIL_NULL_BUFFERS_OP_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/push_options.hpp>
#include <boost/asio/detail/fenced_block.hpp>
#include <boost/asio/detail/handler_alloc_helpers.hpp>
#include <boost/asio/detail/handler_invoke_helpers.hpp>
#include <boost/asio/detail/reactor_op.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename Handler>
class null_buffers_op : public reactor_op
{
public:
null_buffers_op(Handler handler)
: reactor_op(&null_buffers_op::do_perform, &null_buffers_op::do_complete),
handler_(handler)
{
}
static bool do_perform(reactor_op*)
{
return true;
}
static void do_complete(io_service_impl* owner, operation* base,
boost::system::error_code /*ec*/, std::size_t /*bytes_transferred*/)
{
// Take ownership of the handler object.
null_buffers_op* o(static_cast<null_buffers_op*>(base));
typedef handler_alloc_traits<Handler, null_buffers_op> alloc_traits;
handler_ptr<alloc_traits> ptr(o->handler_, o);
// Make the upcall if required.
if (owner)
{
// 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::binder2<Handler, boost::system::error_code, std::size_t>
handler(o->handler_, o->ec_, o->bytes_transferred_);
ptr.reset();
boost::asio::detail::fenced_block b;
boost_asio_handler_invoke_helpers::invoke(handler, handler);
}
}
private:
Handler handler_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_NULL_BUFFERS_OP_HPP
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