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1 | 1 |
2 /* | 2 /* |
3 * Copyright 2006 The Android Open Source Project | 3 * Copyright 2006 The Android Open Source Project |
4 * | 4 * |
5 * Use of this source code is governed by a BSD-style license that can be | 5 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 6 * found in the LICENSE file. |
7 */ | 7 */ |
8 | 8 |
9 | 9 |
10 #ifndef SkRefCnt_DEFINED | 10 #ifndef SkRefCnt_DEFINED |
11 #define SkRefCnt_DEFINED | 11 #define SkRefCnt_DEFINED |
12 | 12 |
13 #include "SkDynamicAnnotations.h" | 13 #include "SkDynamicAnnotations.h" |
14 #include "SkThread.h" | 14 #include "SkThread.h" |
15 #include "SkInstCnt.h" | 15 #include "SkInstCnt.h" |
16 #include "SkTemplates.h" | 16 #include "SkTemplates.h" |
17 | 17 |
18 /** \class SkRefCntBase | 18 /** \class SkRefCntBase |
19 | 19 |
20 SkRefCntBase is the base class for objects that may be shared by multiple | 20 SkRefCntBase is the base class for objects that may be shared by multiple |
21 objects. When an existing owner wants to share a reference, it calls ref(). | 21 objects. When an existing owner wants to share a reference, it calls ref(). |
22 When an owner wants to release its reference, it calls unref(). When the | 22 When an owner wants to release its reference, it calls unref(). When the |
23 shared object's reference count goes to zero as the result of an unref() | 23 shared object's reference count goes to zero as the result of an unref() |
24 call, its (virtual) destructor is called. It is an error for the | 24 call, its (virtual) destructor is called. It is an error for the |
25 destructor to be called explicitly (or via the object going out of scope on | 25 destructor to be called explicitly (or via the object going out of scope on |
26 the stack or calling delete) if getRefCnt() > 1. | 26 the stack or calling delete) if getRefCnt() > 1. |
27 */ | 27 */ |
28 class SK_API SkRefCntBase : SkNoncopyable { | 28 class SK_API SkRefCntBase : SkNoncopyable { |
29 public: | 29 public: |
30 SK_DECLARE_INST_COUNT_ROOT(SkRefCntBase) | 30 SK_DECLARE_INST_COUNT(SkRefCntBase) |
31 | 31 |
32 /** Default construct, initializing the reference count to 1. | 32 /** Default construct, initializing the reference count to 1. |
33 */ | 33 */ |
34 SkRefCntBase() : fRefCnt(1) {} | 34 SkRefCntBase() : fRefCnt(1) {} |
35 | 35 |
36 /** Destruct, asserting that the reference count is 1. | 36 /** Destruct, asserting that the reference count is 1. |
37 */ | 37 */ |
38 virtual ~SkRefCntBase() { | 38 virtual ~SkRefCntBase() { |
39 #ifdef SK_DEBUG | 39 #ifdef SK_DEBUG |
40 SkASSERTF(fRefCnt == 1, "fRefCnt was %d", fRefCnt); | 40 SkASSERTF(fRefCnt == 1, "fRefCnt was %d", fRefCnt); |
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272 SkDELETE((const Derived*)this); | 272 SkDELETE((const Derived*)this); |
273 } | 273 } |
274 } | 274 } |
275 void deref() const { this->unref(); } // Chrome prefers to call deref(). | 275 void deref() const { this->unref(); } // Chrome prefers to call deref(). |
276 | 276 |
277 private: | 277 private: |
278 mutable int32_t fRefCnt; | 278 mutable int32_t fRefCnt; |
279 }; | 279 }; |
280 | 280 |
281 #endif | 281 #endif |
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