asio/include/asio/detail/handler_invoke_helpers.hpp

//
// detail/handler_invoke_helpers.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2011 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 ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP
#define ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"
#include <boost/detail/workaround.hpp>
#include <boost/utility/addressof.hpp>
#include "asio/handler_invoke_hook.hpp"

#include "asio/detail/push_options.hpp"

// Calls to asio_handler_invoke must be made from a namespace that does not
// contain overloads of this function. The asio_handler_invoke_helpers
// namespace is defined here for that purpose.
namespace asio_handler_invoke_helpers {

template <typename Function, typename Context>
inline void invoke(const Function& function, Context& context)
{
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) \
  || BOOST_WORKAROUND(__GNUC__, < 3)
  Function tmp(function);
  tmp();
#else
  using namespace asio;
  asio_handler_invoke(function, boost::addressof(context));
#endif
}

} // namespace asio_handler_invoke_helpers

namespace asio {
namespace detail {

// The default invoker simply forwards to the old-style invocation hook.
template <typename Context>
class default_handler_invoker
{
public:
  explicit default_handler_invoker(Context* context)
    : context_(context)
  {
  }

  template <typename Function>
  void invoke(Function function)
  {
    asio_handler_invoke_helpers::invoke(function, *context_);
  }

private:
  Context* context_;
};

} // namespace detail
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP