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//
// handler_alloc_hook.hpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2014 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_HANDLER_ALLOC_HOOK_HPP
#define BOOST_ASIO_HANDLER_ALLOC_HOOK_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <cstddef>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
/// Default allocation function for handlers.
/**
* Asynchronous operations may need to allocate temporary objects. Since
* asynchronous operations have a handler function object, these temporary
* objects can be said to be associated with the handler.
*
* Implement asio_handler_allocate and asio_handler_deallocate for your own
* handlers to provide custom allocation for these temporary objects.
*
* The default implementation of these allocation hooks uses <tt>::operator
* new</tt> and <tt>::operator delete</tt>.
*
* @note All temporary objects associated with a handler will be deallocated
* before the upcall to the handler is performed. This allows the same memory to
* be reused for a subsequent asynchronous operation initiated by the handler.
*
* @par Example
* @code
* class my_handler;
*
* void* asio_handler_allocate(std::size_t size, my_handler* context)
* {
* return ::operator new(size);
* }
*
* void asio_handler_deallocate(void* pointer, std::size_t size,
* my_handler* context)
* {
* ::operator delete(pointer);
* }
* @endcode
*/
BOOST_ASIO_DECL void* asio_handler_allocate(
std::size_t size, ...);
/// Default deallocation function for handlers.
/**
* Implement asio_handler_allocate and asio_handler_deallocate for your own
* handlers to provide custom allocation for the associated temporary objects.
*
* The default implementation of these allocation hooks uses <tt>::operator
* new</tt> and <tt>::operator delete</tt>.
*
* @sa asio_handler_allocate.
*/
BOOST_ASIO_DECL void asio_handler_deallocate(
void* pointer, std::size_t size, ...);
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#if defined(BOOST_ASIO_HEADER_ONLY)
# include <boost/asio/impl/handler_alloc_hook.ipp>
#endif // defined(BOOST_ASIO_HEADER_ONLY)
#endif // BOOST_ASIO_HANDLER_ALLOC_HOOK_HPP
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