89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
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//
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// handler_alloc_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 ASIO_HANDLER_ALLOC_HOOK_HPP
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#define ASIO_HANDLER_ALLOC_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 "asio/detail/push_options.hpp"
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#include "asio/detail/push_options.hpp"
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#include <cstddef>
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#include <boost/config.hpp>
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#include "asio/detail/pop_options.hpp"
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namespace asio {
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/// Default allocation function for handlers.
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/**
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* Asynchronous operations may need to allocate temporary objects. Since
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* asynchronous operations have a handler function object, these temporary
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* objects can be said to be associated with the handler.
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*
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* Implement asio_handler_allocate and asio_handler_deallocate for your own
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* handlers to provide custom allocation for these temporary objects.
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*
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* This default implementation is simply:
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* @code
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* return ::operator new(size);
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* @endcode
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*
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* @note All temporary objects associated with a handler will be deallocated
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* before the upcall to the handler is performed. This allows the same memory to
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* be reused for a subsequent asynchronous operation initiated by the handler.
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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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* void* asio_handler_allocate(std::size_t size, my_handler* context)
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* {
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* return ::operator new(size);
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* }
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*
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* void asio_handler_deallocate(void* pointer, std::size_t size,
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* my_handler* context)
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* {
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* ::operator delete(pointer);
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* }
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* @endcode
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*/
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inline void* asio_handler_allocate(std::size_t size, ...)
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{
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return ::operator new(size);
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}
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/// Default deallocation function for handlers.
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/**
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* Implement asio_handler_allocate and asio_handler_deallocate for your own
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* handlers to provide custom allocation for the associated temporary objects.
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*
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* This default implementation is simply:
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* @code
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* ::operator delete(pointer);
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* @endcode
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*
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* @sa asio_handler_allocate.
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*/
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inline void asio_handler_deallocate(void* pointer, std::size_t size, ...)
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{
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(void)(size);
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::operator delete(pointer);
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}
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_HANDLER_ALLOC_HOOK_HPP
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