66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
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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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#ifndef BASE_MAC_SCOPED_CFTYPEREF_H_
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#define BASE_MAC_SCOPED_CFTYPEREF_H_
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#include <CoreFoundation/CoreFoundation.h>
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// ScopedCFTypeRef<> is patterned after scoped_ptr<>, but maintains ownership
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// of a CoreFoundation object: any object that can be represented as a
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// CFTypeRef. Style deviations here are solely for compatibility with
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// scoped_ptr<>'s interface, with which everyone is already familiar.
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//
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// When ScopedCFTypeRef<> takes ownership of an object (in the constructor or
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// in reset()), it takes over the caller's existing ownership claim. The
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// caller must own the object it gives to ScopedCFTypeRef<>, and relinquishes
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// an ownership claim to that object. ScopedCFTypeRef<> does not call
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// CFRetain().
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template <typename CFT>
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class ScopedCFTypeRef {
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public:
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typedef CFT element_type;
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explicit ScopedCFTypeRef(CFT object = nullptr) : object_(object) {}
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~ScopedCFTypeRef() {
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if (object_) CFRelease(object_);
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}
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void reset(CFT object = nullptr) {
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if (object_) CFRelease(object_);
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object_ = object;
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}
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bool operator==(CFT that) const { return object_ == that; }
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bool operator!=(CFT that) const { return object_ != that; }
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operator CFT() const { return object_; }
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CFT get() const { return object_; }
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void swap(ScopedCFTypeRef& that) {
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CFT temp = that.object_;
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that.object_ = object_;
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object_ = temp;
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}
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// ScopedCFTypeRef<>::release() is like scoped_ptr<>::release. It is NOT
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// a wrapper for CFRelease(). To force a ScopedCFTypeRef<> object to call
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// CFRelease(), use ScopedCFTypeRef<>::reset().
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CFT release() __attribute__((warn_unused_result)) {
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CFT temp = object_;
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object_ = nullptr;
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return temp;
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}
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private:
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CFT object_;
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Q_DISABLE_COPY(ScopedCFTypeRef);
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};
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#endif // BASE_MAC_SCOPED_CFTYPEREF_H_
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