blob: d315236c9a9a0f775903db8bf7fc949ad7c98bbf (
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
|
//
// detail/object_pool.hpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2012 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_OBJECT_POOL_HPP
#define BOOST_ASIO_DETAIL_OBJECT_POOL_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
template <typename Object>
class object_pool;
class object_pool_access
{
public:
template <typename Object>
static Object* create()
{
return new Object;
}
template <typename Object>
static void destroy(Object* o)
{
delete o;
}
template <typename Object>
static Object*& next(Object* o)
{
return o->next_;
}
template <typename Object>
static Object*& prev(Object* o)
{
return o->prev_;
}
};
template <typename Object>
class object_pool
: private noncopyable
{
public:
// Constructor.
object_pool()
: live_list_(0),
free_list_(0)
{
}
// Destructor destroys all objects.
~object_pool()
{
destroy_list(live_list_);
destroy_list(free_list_);
}
// Get the object at the start of the live list.
Object* first()
{
return live_list_;
}
// Allocate a new object.
Object* alloc()
{
Object* o = free_list_;
if (o)
free_list_ = object_pool_access::next(free_list_);
else
o = object_pool_access::create<Object>();
object_pool_access::next(o) = live_list_;
object_pool_access::prev(o) = 0;
if (live_list_)
object_pool_access::prev(live_list_) = o;
live_list_ = o;
return o;
}
// Free an object. Moves it to the free list. No destructors are run.
void free(Object* o)
{
if (live_list_ == o)
live_list_ = object_pool_access::next(o);
if (object_pool_access::prev(o))
{
object_pool_access::next(object_pool_access::prev(o))
= object_pool_access::next(o);
}
if (object_pool_access::next(o))
{
object_pool_access::prev(object_pool_access::next(o))
= object_pool_access::prev(o);
}
object_pool_access::next(o) = free_list_;
object_pool_access::prev(o) = 0;
free_list_ = o;
}
private:
// Helper function to destroy all elements in a list.
void destroy_list(Object* list)
{
while (list)
{
Object* o = list;
list = object_pool_access::next(o);
object_pool_access::destroy(o);
}
}
// The list of live objects.
Object* live_list_;
// The free list.
Object* free_list_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_OBJECT_POOL_HPP
|
Swift