blob: cce5c4b6de248194728f679dd3a7d6fd18183b75 (
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
91
92
93
94
95
|
//
// detail/handler_work.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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 ASIO_DETAIL_HANDLER_WORK_HPP
#define ASIO_DETAIL_HANDLER_WORK_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/associated_executor.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
// A helper class template to allow completion handlers to be dispatched
// through either the new executors framework or the old invocaton hook. The
// primary template uses the new executors framework.
template <typename Handler, typename Executor
= typename associated_executor<Handler>::type>
class handler_work
{
public:
explicit handler_work(Handler& handler) ASIO_NOEXCEPT
: executor_(associated_executor<Handler>::get(handler))
{
}
static void start(Handler& handler) ASIO_NOEXCEPT
{
Executor ex(associated_executor<Handler>::get(handler));
ex.on_work_started();
}
~handler_work()
{
executor_.on_work_finished();
}
template <typename Function>
void complete(Function& function, Handler& handler)
{
executor_.dispatch(ASIO_MOVE_CAST(Function)(function),
associated_allocator<Handler>::get(handler));
}
private:
// Disallow copying and assignment.
handler_work(const handler_work&);
handler_work& operator=(const handler_work&);
typename associated_executor<Handler>::type executor_;
};
// This specialisation dispatches a handler through the old invocation hook.
// The specialisation is not strictly required for correctness, as the
// system_executor will dispatch through the hook anyway. However, by doing
// this we avoid an extra copy of the handler.
template <typename Handler>
class handler_work<Handler, system_executor>
{
public:
explicit handler_work(Handler&) ASIO_NOEXCEPT {}
static void start(Handler&) ASIO_NOEXCEPT {}
~handler_work() {}
template <typename Function>
void complete(Function& function, Handler& handler)
{
asio_handler_invoke_helpers::invoke(function, handler);
}
private:
// Disallow copying and assignment.
handler_work(const handler_work&);
handler_work& operator=(const handler_work&);
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_HANDLER_WORK_HPP
|
