blob: 75a23862beeeb7c13a6bc847a2323bb0a22d555e (
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
|
#ifndef QPID_REFCOUNTEDBUFFER_H
#define QPID_REFCOUNTEDBUFFER_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include <boost/utility.hpp>
#include <boost/detail/atomic_count.hpp>
#include <boost/intrusive_ptr.hpp>
namespace qpid {
/**
* Reference-counted byte buffer.
* No alignment guarantees.
*/
class RefCountedBuffer : boost::noncopyable {
mutable boost::detail::atomic_count count;
RefCountedBuffer();
void destroy() const;
char* addr() const;
public:
/** Smart char pointer to a reference counted buffer */
class pointer {
boost::intrusive_ptr<RefCountedBuffer> p;
char* cp() const;
pointer(RefCountedBuffer* x);
friend class RefCountedBuffer;
public:
pointer();
pointer(const pointer&);
~pointer();
pointer& operator=(const pointer&);
char* get() { return cp(); }
operator char*() { return cp(); }
char& operator*() { return *cp(); }
char& operator[](size_t i) { return cp()[i]; }
const char* get() const { return cp(); }
operator const char*() const { return cp(); }
const char& operator*() const { return *cp(); }
const char& operator[](size_t i) const { return cp()[i]; }
};
/** Create a reference counted buffer of size n */
static pointer create(size_t n);
/** Get a pointer to the start of the buffer. */
char* get() { return addr(); }
const char* get() const { return addr(); }
char& operator[](size_t i) { return get()[i]; }
const char& operator[](size_t i) const { return get()[i]; }
void addRef() const { ++count; }
void release() const { if (--count==0) destroy(); }
long refCount() { return count; }
};
} // namespace qpid
// intrusive_ptr support.
namespace boost {
inline void intrusive_ptr_add_ref(const qpid::RefCountedBuffer* p) { p->addRef(); }
inline void intrusive_ptr_release(const qpid::RefCountedBuffer* p) { p->release(); }
}
#endif /*!QPID_REFCOUNTEDBUFFER_H*/
|
