b29c883fb4
http://codereview.appspot.com/5076041/ git-svn-id: http://skia.googlecode.com/svn/trunk@2437 2bbb7eff-a529-9590-31e7-b0007b416f81
65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkSkTScopedPtr_DEFINED
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#define SkSkTScopedPtr_DEFINED
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#include "SkTypes.h"
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#include "SkTemplates.h"
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template<typename T>
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class SkBlockComRef : public T {
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private:
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virtual ULONG STDMETHODCALLTYPE AddRef(void) = 0;
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virtual ULONG STDMETHODCALLTYPE Release(void) = 0;
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};
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template<typename T>
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class SkTScopedComPtr : SkNoncopyable {
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private:
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T *fPtr;
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public:
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explicit SkTScopedComPtr(T *ptr = NULL) : fPtr(ptr) { }
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~SkTScopedComPtr() {
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this->reset();
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}
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T &operator*() const { return *fPtr; }
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SkBlockComRef<T> *operator->() const {
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return static_cast<SkBlockComRef<T>*>(fPtr);
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}
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/**
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* Returns the address of the underlying pointer.
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* This is dangerous -- it breaks encapsulation and the reference escapes.
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* Must only be used on instances currently pointing to NULL,
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* and only to initialize the instance.
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*/
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T **operator&() { SkASSERT(fPtr == NULL); return &fPtr; }
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T *get() const { return fPtr; }
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void reset() {
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if (NULL != this->fPtr) {
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this->fPtr->Release();
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this->fPtr = NULL;
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}
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}
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void swap(SkTScopedComPtr<T>& that) {
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T* temp = this->fPtr;
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this->fPtr = that.fPtr;
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that.fPtr = temp;
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}
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T* release() {
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T* temp = this->fPtr;
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this->fPtr = NULL;
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return temp;
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}
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};
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#endif
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