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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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