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git-svn-id: svn://bind10.isc.org/svn/bind10/branches/f2f200910@210 e5f2f494-b856-4b98-b285-d166d9295462
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
//
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// handler_invoke_hook.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_ASIO_HANDLER_INVOKE_HOOK_HPP
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#define BOOST_ASIO_HANDLER_INVOKE_HOOK_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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/// Default invoke function for handlers.
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/**
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* Completion handlers for asynchronous operations are invoked by the
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* io_service associated with the corresponding object (e.g. a socket or
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* deadline_timer). Certain guarantees are made on when the handler may be
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* invoked, in particular that a handler can only be invoked from a thread that
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* is currently calling @c run() on the corresponding io_service object.
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* Handlers may subsequently be invoked through other objects (such as
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* io_service::strand objects) that provide additional guarantees.
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*
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* When asynchronous operations are composed from other asynchronous
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* operations, all intermediate handlers should be invoked using the same
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* method as the final handler. This is required to ensure that user-defined
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* objects are not accessed in a way that may violate the guarantees. This
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* hooking function ensures that the invoked method used for the final handler
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* is accessible at each intermediate step.
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*
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* Implement asio_handler_invoke for your own handlers to specify a custom
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* invocation strategy.
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*
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* This default implementation is simply:
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* @code
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* function();
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* @endcode
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*
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* @par Example
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* @code
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* class my_handler;
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*
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* template <typename Function>
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* void asio_handler_invoke(Function function, my_handler* context)
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* {
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* context->strand_.dispatch(function);
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* }
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* @endcode
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*/
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template <typename Function>
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inline void asio_handler_invoke(Function function, ...)
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{
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function();
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}
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_HANDLER_INVOKE_HOOK_HPP
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