blob: 49e71231f4de70024e74aae0506d1dad7dec211e (
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
|
//
// handler_type.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2016 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_HANDLER_TYPE_HPP
#define ASIO_HANDLER_TYPE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/type_traits.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
/// (Deprecated: Use two-parameter version of async_result.) Default handler
/// type traits provided for all completion token types.
/**
* The handler_type traits class is used for determining the concrete handler
* type to be used for an asynchronous operation. It allows the handler type to
* be determined at the point where the specific completion handler signature
* is known.
*
* This template may be specialised for user-defined completion token types.
*/
template <typename CompletionToken, typename Signature, typename = void>
struct handler_type
{
/// The handler type for the specific signature.
typedef typename conditional<
is_same<CompletionToken, typename decay<CompletionToken>::type>::value,
decay<CompletionToken>,
handler_type<typename decay<CompletionToken>::type, Signature>
>::type::type type;
};
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_HANDLER_TYPE_HPP
|
