blob: 9cd3cfa9676b203a5c5231ea710637c5425a32c8 (
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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_SCOPED_CFTYPEREF_H_
#define BASE_SCOPED_CFTYPEREF_H_
#include <CoreFoundation/CoreFoundation.h>
#include "base/basictypes.h"
// scoped_cftyperef<> is patterned after scoped_ptr<>, but maintains ownership
// of a CoreFoundation object: any object that can be represented as a
// CFTypeRef. Style deviations here are solely for compatibility with
// scoped_ptr<>'s interface, with which everyone is already familiar.
//
// When scoped_cftyperef<> takes ownership of an object (in the constructor or
// in reset()), it takes over the caller's existing ownership claim. The
// caller must own the object it gives to scoped_cftyperef<>, and relinquishes
// an ownership claim to that object. scoped_cftyperef<> does not call
// CFRetain().
template <typename CFT>
class scoped_cftyperef {
public:
typedef CFT element_type;
explicit scoped_cftyperef(CFT object = NULL) : object_(object) {}
~scoped_cftyperef() {
if (object_) CFRelease(object_);
}
void reset(CFT object = NULL) {
if (object_) CFRelease(object_);
object_ = object;
}
bool operator==(CFT that) const { return object_ == that; }
bool operator!=(CFT that) const { return object_ != that; }
operator CFT() const { return object_; }
CFT get() const { return object_; }
void swap(scoped_cftyperef& that) {
CFT temp = that.object_;
that.object_ = object_;
object_ = temp;
}
// scoped_cftyperef<>::release() is like scoped_ptr<>::release. It is NOT
// a wrapper for CFRelease(). To force a scoped_cftyperef<> object to call
// CFRelease(), use scoped_cftyperef<>::reset().
CFT release() {
CFT temp = object_;
object_ = NULL;
return temp;
}
private:
CFT object_;
DISALLOW_COPY_AND_ASSIGN(scoped_cftyperef);
};
#endif // BASE_SCOPED_CFTYPEREF_H_
|
