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Side by Side Diff: include/core/SkTScopedPtr.h

Issue 23621005: Replace SkTScopedPtr with SkAutoTDelete in Skia. (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: port class comment Created 7 years, 3 months ago
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1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10 #ifndef SkTScopedPtr_DEFINED
11 #define SkTScopedPtr_DEFINED
12
13 #include "SkTypes.h"
14
15 /** \class SkTScopedPtr
16 A SkTScopedPtr<T> is like a T*, except that the destructor of SkTScopedPtr<T>
17 automatically deletes the pointer it holds (if any). That is, SkTScopedPtr<T>
18 owns the T object that it points to. Like a T*, a SkTScopedPtr<T> may hold
19 either NULL or a pointer to a T object. Also like T*, SkTScopedPtr<T> is
20 thread-compatible, and once you dereference it, you get the threadsafety
21 guarantees of T.
22
23 The size of a SkTScopedPtr is small: sizeof(SkTScopedPtr<T>) == sizeof(T*)
24 */
25 template <typename T> class SkTScopedPtr : SkNoncopyable {
26 public:
27 explicit SkTScopedPtr(T* o = NULL) : fObj(o) {}
28 ~SkTScopedPtr() {
29 enum { kTypeMustBeComplete = sizeof(T) };
30 delete fObj;
31 }
32
33 /** Delete the current object, if any. Then take ownership of the
34 passed object.
35 */
36 void reset(T* o = NULL) {
37 if (o != fObj) {
38 enum { kTypeMustBeComplete = sizeof(T) };
39 delete fObj;
40 fObj = o;
41 }
42 }
43
44 /** Without deleting the current object, return it and forget about it.
45 Similar to calling get() and reset(), but the object is not deleted.
46 */
47 T* release() {
48 T* retVal = fObj;
49 fObj = NULL;
50 return retVal;
51 }
52
53 T& operator*() const {
54 SkASSERT(fObj != NULL);
55 return *fObj;
56 }
57 T* operator->() const {
58 SkASSERT(fObj != NULL);
59 return fObj;
60 }
61 T* get() const { return fObj; }
62
63 bool operator==(T* o) const { return fObj == o; }
64 bool operator!=(T* o) const { return fObj != o; }
65
66 private:
67 T* fObj;
68
69 // Forbid comparison of SkTScopedPtr types. If T2 != T, it doesn't make
70 // sense, and if T2 == T, it still doesn't make sense because the same
71 // object can't be owned by two different scoped_ptrs.
72 template <class T2> bool operator==(SkTScopedPtr<T2> const& o2) const;
73 template <class T2> bool operator!=(SkTScopedPtr<T2> const& o2) const;
74 };
75
76 #endif
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