blob: ddf3e1870ae444630a769c4c05788292fb28fded (
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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
//
// op_queue.hpp
// ~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 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_DETAIL_OP_QUEUE_HPP
#define BOOST_ASIO_DETAIL_OP_QUEUE_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/noncopyable.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename Operation>
class op_queue;
class op_queue_access
{
public:
template <typename Operation>
static Operation* next(Operation* o)
{
return static_cast<Operation*>(o->next_);
}
template <typename Operation1, typename Operation2>
static void next(Operation1*& o1, Operation2* o2)
{
o1->next_ = o2;
}
template <typename Operation>
static void destroy(Operation* o)
{
o->destroy();
}
template <typename Operation>
static Operation*& front(op_queue<Operation>& q)
{
return q.front_;
}
template <typename Operation>
static Operation*& back(op_queue<Operation>& q)
{
return q.back_;
}
};
template <typename Operation>
class op_queue
: private noncopyable
{
public:
// Constructor.
op_queue()
: front_(0),
back_(0)
{
}
// Destructor destroys all operations.
~op_queue()
{
while (Operation* op = front_)
{
pop();
op_queue_access::destroy(op);
}
}
// Get the operation at the front of the queue.
Operation* front()
{
return front_;
}
// Pop an operation from the front of the queue.
void pop()
{
if (front_)
{
Operation* tmp = front_;
front_ = op_queue_access::next(front_);
if (front_ == 0)
back_ = 0;
op_queue_access::next(tmp, static_cast<Operation*>(0));
}
}
// Push an operation on to the back of the queue.
void push(Operation* h)
{
op_queue_access::next(h, static_cast<Operation*>(0));
if (back_)
{
op_queue_access::next(back_, h);
back_ = h;
}
else
{
front_ = back_ = h;
}
}
// Push all operations from another queue on to the back of the queue. The
// source queue may contain operations of a derived type.
template <typename OtherOperation>
void push(op_queue<OtherOperation>& q)
{
if (Operation* other_front = op_queue_access::front(q))
{
if (back_)
op_queue_access::next(back_, other_front);
else
front_ = other_front;
back_ = op_queue_access::back(q);
op_queue_access::front(q) = 0;
op_queue_access::back(q) = 0;
}
}
// Whether the queue is empty.
bool empty() const
{
return front_ == 0;
}
private:
friend class op_queue_access;
// The front of the queue.
Operation* front_;
// The back of the queue.
Operation* back_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_OP_QUEUE_HPP
|
Swift