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66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
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// Copyright 2016 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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#if defined(__has_feature) && __has_feature(objc_arc)
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#error "ARC manages properties, so base::mac::ReleaseProperties isn't needed."
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#endif
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#ifndef BASE_MAC_OBJC_RELEASE_PROPERTIES_H_
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#define BASE_MAC_OBJC_RELEASE_PROPERTIES_H_
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#import <Foundation/Foundation.h>
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#include "base/base_export.h"
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// base::mac::ReleaseProperties(self) can be used in a class's -dealloc method
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// to release all properties marked "retain" or "copy" and backed by instance
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// variables. It only affects properties defined by the calling class, not
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// sub/superclass properties.
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//
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// Example usage:
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//
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// @interface AllaysIBF : NSObject
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//
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// @property(retain, nonatomic) NSString* string;
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// @property(copy, nonatomic) NSMutableDictionary* dictionary;
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// @property(assign, nonatomic) IBFDelegate* delegate;
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//
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// @end // @interface AllaysIBF
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//
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// @implementation AllaysIBF
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//
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// - (void)dealloc {
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// base::mac::ReleaseProperties(self);
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// [super dealloc];
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// }
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//
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// @end // @implementation AllaysIBF
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//
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// self.string and self.dictionary will each be released, but self.delegate
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// will not because it is marked "assign", not "retain" or "copy".
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//
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// Another approach would be to provide a base class to inherit from whose
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// -dealloc walks the property lists of all subclasses to release their
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// properties. Distant subclasses might not expect it and over-release their
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// properties, so don't do that.
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namespace base {
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namespace mac {
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namespace details {
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BASE_EXPORT void ReleaseProperties(id, Class);
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} // namespace details
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template <typename Self>
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void ReleaseProperties(Self* self) {
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details::ReleaseProperties(self, [Self class]);
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}
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} // namespace mac
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} // namespace base
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#endif // BASE_MAC_OBJC_RELEASE_PROPERTIES_H_
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