105 lines
3.3 KiB
C++
105 lines
3.3 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) 2003-2021 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/config.hpp"
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#include <cstddef>
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#include "asio/detail/push_options.hpp"
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namespace asio {
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#if defined(ASIO_NO_DEPRECATED)
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// Places in asio that would have previously called the allocate or deallocate
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// hooks to manage memory, now call them only to check whether the result types
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// are these types. If the result is not the correct type, it indicates that
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// the user code still has the old hooks in place, and if so we want to trigger
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// a compile error.
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enum asio_handler_allocate_is_no_longer_used {};
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enum asio_handler_deallocate_is_no_longer_used {};
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typedef asio_handler_allocate_is_no_longer_used
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asio_handler_allocate_is_deprecated;
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typedef asio_handler_deallocate_is_no_longer_used
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asio_handler_deallocate_is_deprecated;
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#else // defined(ASIO_NO_DEPRECATED)
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typedef void* asio_handler_allocate_is_deprecated;
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typedef void asio_handler_deallocate_is_deprecated;
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#endif // defined(ASIO_NO_DEPRECATED)
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/// (Deprecated: Use the associated_allocator trait.) Default allocation
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/// 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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* The default implementation of these allocation hooks uses <tt>::operator
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* new</tt> and <tt>::operator delete</tt>.
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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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ASIO_DECL asio_handler_allocate_is_deprecated
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asio_handler_allocate(std::size_t size, ...);
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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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* The default implementation of these allocation hooks uses <tt>::operator
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* new</tt> and <tt>::operator delete</tt>.
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*
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* @sa asio_handler_allocate.
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*/
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ASIO_DECL asio_handler_deallocate_is_deprecated
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asio_handler_deallocate(void* pointer, std::size_t size, ...);
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#if defined(ASIO_HEADER_ONLY)
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# include "asio/impl/handler_alloc_hook.ipp"
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#endif // defined(ASIO_HEADER_ONLY)
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#endif // ASIO_HANDLER_ALLOC_HOOK_HPP
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