Move base to DEPS

base/mac/objc_property_releaser.h

-// Copyright (c) 2011 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_MAC_OBJC_PROPERTY_RELEASER_H_
-#define BASE_MAC_OBJC_PROPERTY_RELEASER_H_
-
-#import <Foundation/Foundation.h>
-
-#include "base/base_export.h"
-
-namespace base {
-namespace mac {
-
-// ObjCPropertyReleaser is a C++ class that can automatically release
-// synthesized Objective-C properties marked "retain" or "copy". The expected
-// use is to place an ObjCPropertyReleaser object within an Objective-C class
-// definition. When built with the -fobjc-call-cxx-cdtors compiler option,
-// the ObjCPropertyReleaser's destructor will be called when the Objective-C
-// object that owns it is deallocated, and it will send a -release message to
-// the instance variables backing the appropriate properties. If
-// -fobjc-call-cxx-cdtors is not in use, ObjCPropertyReleaser's
-// ReleaseProperties method can be called from -dealloc to achieve the same
-// effect.
-//
-// Example usage:
-//
-// @interface AllaysIBF : NSObject {
-//  @private
-//   NSString* string_;
-//   NSMutableDictionary* dictionary_;
-//   NSString* notAProperty_;
-//   IBFDelegate* delegate_;  // weak
-//
-//   // It's recommended to put the class name into the property releaser's
-//   // instance variable name to gracefully handle subclassing, where
-//   // multiple classes in a hierarchy might want their own property
-//   // releasers.
-//   base::mac::ObjCPropertyReleaser propertyReleaser_AllaysIBF_;
-// }
-//
-// @property(retain, nonatomic) NSString* string;
-// @property(copy, nonatomic) NSMutableDictionary* dictionary;
-// @property(assign, nonatomic) IBFDelegate* delegate;
-// @property(retain, nonatomic) NSString* autoProp;
-//
-// @end  // @interface AllaysIBF
-//
-// @implementation AllaysIBF
-//
-// @synthesize string = string_;
-// @synthesize dictionary = dictionary_;
-// @synthesize delegate = delegate_;
-// @synthesize autoProp;
-//
-// - (id)init {
-//   if ((self = [super init])) {
-//     // Initialize with [AllaysIBF class]. Never use [self class] because
-//     // in the case of subclassing, it will return the most specific class
-//     // for |self|, which may not be the same as [AllaysIBF class]. This
-//     // would cause AllaysIBF's -.cxx_destruct or -dealloc to release
-//     // instance variables that only exist in subclasses, likely causing
-//     // mass disaster.
-//     propertyReleaser_AllaysIBF_.Init(self, [AllaysIBF class]);
-//   }
-//   return self;
-// }
-//
-// @end  // @implementation AllaysIBF
-//
-// When an instance of AllaysIBF is deallocated, the ObjCPropertyReleaser will
-// send a -release message to string_, dictionary_, and the compiler-created
-// autoProp instance variables. No -release will be sent to delegate_ as it
-// is marked "assign" and not "retain" or "copy". No -release will be sent to
-// notAProperty_ because it doesn't correspond to any declared @property.
-//
-// Another way of doing this would be to provide a base class that others can
-// inherit from, and to have the base class' -dealloc walk the property lists
-// of all subclasses in an object to send the -release messages. Since this
-// involves a base reaching into its subclasses, it's deemed scary, so don't
-// do it. ObjCPropertyReleaser's design ensures that the property releaser
-// will only operate on instance variables in the immediate object in which
-// the property releaser is placed.
-
-class BASE_EXPORT ObjCPropertyReleaser {
- public:
-  // ObjCPropertyReleaser can only be owned by an Objective-C object, so its
-  // memory is always guaranteed to be 0-initialized. Not defining the default
-  // constructor can prevent an otherwise no-op -.cxx_construct method from
-  // showing up in Objective-C classes that contain a ObjCPropertyReleaser.
-
-  // Upon destruction (expected to occur from an Objective-C object's
-  // -.cxx_destruct method), release all properties.
-  ~ObjCPropertyReleaser() {
-    ReleaseProperties();
-  }
-
-  // Initialize this object so that it's armed to release the properties of
-  // object |object|, which must be of type |classy|. The class argument must
-  // be supplied separately and cannot be gleaned from the object's own type
-  // because an object will allays identify itself as the most-specific type
-  // that describes it, but the ObjCPropertyReleaser needs to know which class
-  // type in the class hierarchy it's responsible for releasing properties
-  // for. For the same reason, Init must be called with a |classy| argument
-  // initialized using a +class (class) method such as [MyClass class], and
-  // never a -class (instance) method such as [self class].
-  //
-  // -.cxx_construct can only call the default constructor, but
-  // ObjCPropertyReleaser needs to know about the Objective-C object that owns
-  // it, so this can't be handled in a constructor, it needs to be a distinct
-  // Init method.
-  void Init(id object, Class classy);
-
-  // Release all of the properties in object_ defined in class_ as either
-  // "retain" or "copy" and with an identifiable backing instance variable.
-  // Properties must be synthesized to have identifiable instance variables.
-  void ReleaseProperties();
-
- private:
-  id object_;
-  Class class_;
-};
-
-}  // namespace mac
-}  // namespace base
-
-#endif  // BASE_MAC_OBJC_PROPERTY_RELEASER_H_