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