The Tor Browser: ipc/chromium/src/base/scoped

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #ifndef BASE_SCOPED_NSOBJECT_H_

     6 #define BASE_SCOPED_NSOBJECT_H_

     8 #import <Foundation/Foundation.h>

     9 #include "base/basictypes.h"

    11 // scoped_nsobject<> is patterned after scoped_ptr<>, but maintains ownership

    12 // of an NSObject subclass object.  Style deviations here are solely for

    13 // compatibility with scoped_ptr<>'s interface, with which everyone is already

    14 // familiar.

    15 //

    16 // When scoped_nsobject<> takes ownership of an object (in the constructor or

    17 // in reset()), it takes over the caller's existing ownership claim.  The

    18 // caller must own the object it gives to scoped_nsobject<>, and relinquishes

    19 // an ownership claim to that object.  scoped_nsobject<> does not call

    20 // -retain.

    21 template<typename NST>

    22 class scoped_nsobject {

    23  public:

    24   typedef NST* element_type;

    26   explicit scoped_nsobject(NST* object = nil)

    27       : object_(object) {

    28   }

    30   ~scoped_nsobject() {

    31     [object_ release];

    32   }

    34   void reset(NST* object = nil) {

    35     [object_ release];

    36     object_ = object;

    37   }

    39   bool operator==(NST* that) const {

    40     return object_ == that;

    41   }

    43   bool operator!=(NST* that) const {

    44     return object_ != that;

    45   }

    47   operator NST*() const {

    48     return object_;

    49   }

    51   NST* get() const {

    52     return object_;

    53   }

    55   void swap(scoped_nsobject& that) {

    56     NST* temp = that.object_;

    57     that.object_ = object_;

    58     object_ = temp;

    59   }

    61   // scoped_nsobject<>::release() is like scoped_ptr<>::release.  It is NOT

    62   // a wrapper for [object_ release].  To force a scoped_nsobject<> object to

    63   // call [object_ release], use scoped_nsobject<>::reset().

    64   NST* release() {

    65     NST* temp = object_;

    66     object_ = nil;

    67     return temp;

    68   }

    70  private:

    71   NST* object_;

    73   DISALLOW_COPY_AND_ASSIGN(scoped_nsobject);

    74 };

    76 #endif  // BASE_SCOPED_NSOBJECT_H_

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