blob: 092f02b3afec4db157bd5b6cd1b4c6edf2faa542 (
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
|
/*
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*
*/
#ifndef SDK_OBJC_HELPERS_SCOPED_CFTYPEREF_H_
#define SDK_OBJC_HELPERS_SCOPED_CFTYPEREF_H_
#include <CoreFoundation/CoreFoundation.h>
namespace rtc {
// RETAIN: ScopedTypeRef should retain the object when it takes
// ownership.
// ASSUME: Assume the object already has already been retained.
// ScopedTypeRef takes over ownership.
enum class RetainPolicy { RETAIN, ASSUME };
namespace internal {
template <typename T>
struct CFTypeRefTraits {
static T InvalidValue() { return nullptr; }
static void Release(T ref) { CFRelease(ref); }
static T Retain(T ref) {
CFRetain(ref);
return ref;
}
};
template <typename T, typename Traits>
class ScopedTypeRef {
public:
ScopedTypeRef() : ptr_(Traits::InvalidValue()) {}
explicit ScopedTypeRef(T ptr) : ptr_(ptr) {}
ScopedTypeRef(T ptr, RetainPolicy policy) : ScopedTypeRef(ptr) {
if (ptr_ && policy == RetainPolicy::RETAIN)
Traits::Retain(ptr_);
}
ScopedTypeRef(const ScopedTypeRef<T, Traits>& rhs) : ptr_(rhs.ptr_) {
if (ptr_)
ptr_ = Traits::Retain(ptr_);
}
~ScopedTypeRef() {
if (ptr_) {
Traits::Release(ptr_);
}
}
T get() const { return ptr_; }
T operator->() const { return ptr_; }
explicit operator bool() const { return ptr_; }
bool operator!() const { return !ptr_; }
ScopedTypeRef& operator=(const T& rhs) {
if (ptr_)
Traits::Release(ptr_);
ptr_ = rhs;
return *this;
}
ScopedTypeRef& operator=(const ScopedTypeRef<T, Traits>& rhs) {
reset(rhs.get(), RetainPolicy::RETAIN);
return *this;
}
// This is intended to take ownership of objects that are
// created by pass-by-pointer initializers.
T* InitializeInto() {
RTC_DCHECK(!ptr_);
return &ptr_;
}
void reset(T ptr, RetainPolicy policy = RetainPolicy::ASSUME) {
if (ptr && policy == RetainPolicy::RETAIN)
Traits::Retain(ptr);
if (ptr_)
Traits::Release(ptr_);
ptr_ = ptr;
}
T release() {
T temp = ptr_;
ptr_ = Traits::InvalidValue();
return temp;
}
private:
T ptr_;
};
} // namespace internal
template <typename T>
using ScopedCFTypeRef =
internal::ScopedTypeRef<T, internal::CFTypeRefTraits<T>>;
template <typename T>
static ScopedCFTypeRef<T> AdoptCF(T cftype) {
return ScopedCFTypeRef<T>(cftype, RetainPolicy::RETAIN);
}
template <typename T>
static ScopedCFTypeRef<T> ScopedCF(T cftype) {
return ScopedCFTypeRef<T>(cftype);
}
} // namespace rtc
#endif // SDK_OBJC_HELPERS_SCOPED_CFTYPEREF_H_
|
