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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/memory/scoped_ptr.h" | 5 #include "base/memory/scoped_ptr.h" |
6 | 6 |
7 #include <sstream> | 7 #include <sstream> |
8 | 8 |
9 #include "base/basictypes.h" | 9 #include "base/basictypes.h" |
10 #include "base/bind.h" | 10 #include "base/bind.h" |
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702 | 702 |
703 struct StructB { | 703 struct StructB { |
704 scoped_ptr<StructA> a; | 704 scoped_ptr<StructA> a; |
705 }; | 705 }; |
706 | 706 |
707 // Create a reference cycle. | 707 // Create a reference cycle. |
708 StructA* a = new StructA; | 708 StructA* a = new StructA; |
709 a->b.reset(new StructB); | 709 a->b.reset(new StructB); |
710 a->b->a.reset(a); | 710 a->b->a.reset(a); |
711 | 711 |
712 // Break the cycle by calling reset(). This will cause |a| (and hence, |a.b|) | 712 // Break the cycle by calling reset(). This will cause |a| (and hence, |a->b|) |
713 // to be deleted before the call to reset() returns. This tests that the | 713 // to be deleted before the call to reset() returns. This tests that the |
714 // implementation of scoped_ptr::reset() doesn't access |this| after it | 714 // implementation of scoped_ptr::reset() doesn't access |this| after it |
715 // deletes the underlying pointer. This behaviour is consistent with the | 715 // deletes the underlying pointer. This behaviour is consistent with the |
716 // definition of unique_ptr::reset in C++11. | 716 // definition of unique_ptr::reset in C++11. |
717 a->b.reset(); | 717 a->b.reset(); |
| 718 |
| 719 // Go again, but this time, break the cycle by invoking |a|'s destructor. This |
| 720 // tests that the implementation of ~scoped_ptr doesn't infinitely recurse |
| 721 // into the destructors of |a| and |a->b|. Note, deleting |a| instead will |
| 722 // cause |a| to be double-free'd because |a->b| owns |a| and deletes it via |
| 723 // its destructor. |
| 724 a = new StructA; |
| 725 a->b.reset(new StructB); |
| 726 a->b->a.reset(a); |
| 727 a->~StructA(); |
718 } | 728 } |
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