summaryrefslogtreecommitdiffstats
blob: e949529413919ac1689d98c23eeed1460ab5defe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
//
// handler_alloc_hook.hpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2008 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/push_options.hpp>

#include <boost/asio/detail/push_options.hpp>
#include <cstddef>
#include <boost/config.hpp>
#include <boost/asio/detail/pop_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.
 *
 * This default implementation is simply:
 * @code
 * return ::operator new(size);
 * @endcode
 *
 * @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
 */
inline void* asio_handler_allocate(std::size_t size, ...)
{
  return ::operator new(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.
 *
 * This default implementation is simply:
 * @code
 * ::operator delete(pointer);
 * @endcode
 *
 * @sa asio_handler_allocate.
 */
inline void asio_handler_deallocate(void* pointer, std::size_t size, ...)
{
  (void)(size);
  ::operator delete(pointer);
}

} // namespace asio
} // namespace boost

#include <boost/asio/detail/pop_options.hpp>

#endif // BOOST_ASIO_HANDLER_ALLOC_HOOK_HPP