| // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_SCOPED_CFTYPEREF_H_ |
| #define BASE_SCOPED_CFTYPEREF_H_ |
| |
| #include <CoreFoundation/CoreFoundation.h> |
| #include "base/basictypes.h" |
| #include "base/compiler_specific.h" |
| |
| // scoped_cftyperef<> is patterned after scoped_ptr<>, but maintains ownership |
| // of a CoreFoundation object: any object that can be represented as a |
| // CFTypeRef. Style deviations here are solely for compatibility with |
| // scoped_ptr<>'s interface, with which everyone is already familiar. |
| // |
| // When scoped_cftyperef<> takes ownership of an object (in the constructor or |
| // in reset()), it takes over the caller's existing ownership claim. The |
| // caller must own the object it gives to scoped_cftyperef<>, and relinquishes |
| // an ownership claim to that object. scoped_cftyperef<> does not call |
| // CFRetain(). |
| template<typename CFT> |
| class scoped_cftyperef { |
| public: |
| typedef CFT element_type; |
| |
| explicit scoped_cftyperef(CFT object = NULL) |
| : object_(object) { |
| } |
| |
| ~scoped_cftyperef() { |
| if (object_) |
| CFRelease(object_); |
| } |
| |
| void reset(CFT object = NULL) { |
| if (object_) |
| CFRelease(object_); |
| object_ = object; |
| } |
| |
| bool operator==(CFT that) const { |
| return object_ == that; |
| } |
| |
| bool operator!=(CFT that) const { |
| return object_ != that; |
| } |
| |
| operator CFT() const { |
| return object_; |
| } |
| |
| CFT get() const { |
| return object_; |
| } |
| |
| void swap(scoped_cftyperef& that) { |
| CFT temp = that.object_; |
| that.object_ = object_; |
| object_ = temp; |
| } |
| |
| // scoped_cftyperef<>::release() is like scoped_ptr<>::release. It is NOT |
| // a wrapper for CFRelease(). To force a scoped_cftyperef<> object to call |
| // CFRelease(), use scoped_cftyperef<>::reset(). |
| CFT release() WARN_UNUSED_RESULT { |
| CFT temp = object_; |
| object_ = NULL; |
| return temp; |
| } |
| |
| private: |
| CFT object_; |
| |
| DISALLOW_COPY_AND_ASSIGN(scoped_cftyperef); |
| }; |
| |
| #endif // BASE_SCOPED_CFTYPEREF_H_ |