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77 lines
1.9 KiB
Objective-C
77 lines
1.9 KiB
Objective-C
// Copyright (c) 2009 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_SCOPED_NSOBJECT_H_
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#define BASE_SCOPED_NSOBJECT_H_
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#import <Foundation/Foundation.h>
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#include "base/basictypes.h"
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// scoped_nsobject<> is patterned after scoped_ptr<>, but maintains ownership
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// of an NSObject subclass object. Style deviations here are solely for
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// compatibility with scoped_ptr<>'s interface, with which everyone is already
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// familiar.
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//
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// When scoped_nsobject<> 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 scoped_nsobject<>, and relinquishes
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// an ownership claim to that object. scoped_nsobject<> does not call
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// -retain.
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template<typename NST>
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class scoped_nsobject {
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public:
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typedef NST* element_type;
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explicit scoped_nsobject(NST* object = nil)
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: object_(object) {
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}
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~scoped_nsobject() {
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[object_ release];
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}
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void reset(NST* object = nil) {
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[object_ release];
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object_ = object;
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}
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bool operator==(NST* that) const {
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return object_ == that;
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}
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bool operator!=(NST* that) const {
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return object_ != that;
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}
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operator NST*() const {
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return object_;
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}
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NST* get() const {
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return object_;
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}
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void swap(scoped_nsobject& that) {
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NST* temp = that.object_;
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that.object_ = object_;
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object_ = temp;
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}
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// scoped_nsobject<>::release() is like scoped_ptr<>::release. It is NOT
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// a wrapper for [object_ release]. To force a scoped_nsobject<> object to
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// call [object_ release], use scoped_nsobject<>::reset().
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NST* release() {
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NST* temp = object_;
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object_ = nil;
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return temp;
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}
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private:
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NST* object_;
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DISALLOW_COPY_AND_ASSIGN(scoped_nsobject);
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};
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#endif // BASE_SCOPED_NSOBJECT_H_
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