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git.ipfire.org Git - thirdparty/squid.git/blob - src/base/RefCount.h
2 * Copyright (C) 1996-2014 The Squid Software Foundation and contributors
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
9 /* DEBUG: section -- Refcount allocator */
11 #ifndef SQUID_REFCOUNT_H_
12 #define SQUID_REFCOUNT_H_
14 // reference counting requires the Lock API on base classes
15 #include "base/Lock.h"
20 * Template for Reference Counting pointers.
22 * Objects of type 'C' must inherit from 'RefCountable' in base/Lock.h
23 * which provides the locking interface used by reference counting.
30 RefCount () : p_ (NULL
) {}
32 RefCount (C
const *p
) : p_(p
) { reference (*this); }
38 RefCount (const RefCount
&p
) : p_(p
.p_
) {
42 RefCount
& operator = (const RefCount
& p
) {
43 // DO NOT CHANGE THE ORDER HERE!!!
44 // This preserves semantics on self assignment
45 C
const *newP_
= p
.p_
;
51 bool operator !() const { return !p_
; }
53 C
* operator-> () const {return const_cast<C
*>(p_
); }
55 C
& operator * () const {return *const_cast<C
*>(p_
); }
57 C
const * getRaw() const {return p_
; }
59 C
* getRaw() {return const_cast<C
*>(p_
); }
61 bool operator == (const RefCount
& p
) const {
65 bool operator != (const RefCount
&p
) const {
70 void dereference(C
const *newP
= NULL
) {
71 /* Setting p_ first is important:
72 * we may be freed ourselves as a result of
75 C
const (*tempP_
) (p_
);
78 if (tempP_
&& tempP_
->unlock() == 0)
82 void reference (const RefCount
& p
) {
92 inline std::ostream
&operator <<(std::ostream
&os
, const RefCount
<C
> &p
)
95 return os
<< p
.getRaw() << '*' << p
->LockCount();
100 #endif /* SQUID_REFCOUNT_H_ */