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| 1 // Copyright 2014 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. |
| 4 |
| 5 #ifndef CYCLE_SUPER_NEG_H_ |
| 6 #define CYCLE_SUPER_NEG_H_ |
| 7 |
| 8 #include "heap/stubs.h" |
| 9 |
| 10 namespace blink { |
| 11 |
| 12 class C; |
| 13 |
| 14 // The chain: |
| 15 // C -per-> B -sup-> A -sub-> D -ref-> C |
| 16 // is not a leaking cycle, because the super-class relationship |
| 17 // should not transitively imply sub-class relationships. |
| 18 // I.e. B -/-> D |
| 19 |
| 20 class A : public GarbageCollectedFinalized<A> { |
| 21 public: |
| 22 virtual void trace(Visitor*) {} |
| 23 }; |
| 24 |
| 25 class B : public A { |
| 26 public: |
| 27 virtual void trace(Visitor*); |
| 28 }; |
| 29 |
| 30 class C : public RefCounted<C> { |
| 31 private: |
| 32 Persistent<B> m_b; |
| 33 }; |
| 34 |
| 35 class D : public A { |
| 36 public: |
| 37 virtual void trace(Visitor*); |
| 38 private: |
| 39 RefPtr<C> m_c; |
| 40 }; |
| 41 |
| 42 } |
| 43 |
| 44 #endif |
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