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1 /* | 1 /* |
2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkWeakRefCnt_DEFINED | 8 #ifndef SkWeakRefCnt_DEFINED |
9 #define SkWeakRefCnt_DEFINED | 9 #define SkWeakRefCnt_DEFINED |
10 | 10 |
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44 if (myRef.try_ref()) { | 44 if (myRef.try_ref()) { |
45 ... // use myRef | 45 ... // use myRef |
46 myRef.unref(); | 46 myRef.unref(); |
47 } else { | 47 } else { |
48 // myRef is in the disposed state | 48 // myRef is in the disposed state |
49 } | 49 } |
50 myRef.weak_unref(); | 50 myRef.weak_unref(); |
51 */ | 51 */ |
52 class SK_API SkWeakRefCnt : public SkRefCnt { | 52 class SK_API SkWeakRefCnt : public SkRefCnt { |
53 public: | 53 public: |
54 SK_DECLARE_INST_COUNT(SkWeakRefCnt) | |
55 | |
56 /** Default construct, initializing the reference counts to 1. | 54 /** Default construct, initializing the reference counts to 1. |
57 The strong references collectively hold one weak reference. When the | 55 The strong references collectively hold one weak reference. When the |
58 strong reference count goes to zero, the collectively held weak | 56 strong reference count goes to zero, the collectively held weak |
59 reference is released. | 57 reference is released. |
60 */ | 58 */ |
61 SkWeakRefCnt() : SkRefCnt(), fWeakCnt(1) {} | 59 SkWeakRefCnt() : SkRefCnt(), fWeakCnt(1) {} |
62 | 60 |
63 /** Destruct, asserting that the weak reference count is 1. | 61 /** Destruct, asserting that the weak reference count is 1. |
64 */ | 62 */ |
65 virtual ~SkWeakRefCnt() { | 63 virtual ~SkWeakRefCnt() { |
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152 weak_unref(); | 150 weak_unref(); |
153 } | 151 } |
154 | 152 |
155 /* Invariant: fWeakCnt = #weak + (fRefCnt > 0 ? 1 : 0) */ | 153 /* Invariant: fWeakCnt = #weak + (fRefCnt > 0 ? 1 : 0) */ |
156 mutable int32_t fWeakCnt; | 154 mutable int32_t fWeakCnt; |
157 | 155 |
158 typedef SkRefCnt INHERITED; | 156 typedef SkRefCnt INHERITED; |
159 }; | 157 }; |
160 | 158 |
161 #endif | 159 #endif |
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