| // Copyright 2014 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 CYCLE_SUPER_NEG_H_ |
| #define CYCLE_SUPER_NEG_H_ |
| |
| #include "heap/stubs.h" |
| |
| namespace blink { |
| |
| class C; |
| |
| // The chain: |
| // C -per-> B -sup-> A -sub-> D -ref-> C |
| // is not a leaking cycle, because the super-class relationship |
| // should not transitively imply sub-class relationships. |
| // I.e. B -/-> D |
| |
| class A : public GarbageCollectedFinalized<A> { |
| public: |
| virtual void Trace(Visitor*) {} |
| }; |
| |
| class B : public A { |
| public: |
| virtual void Trace(Visitor*); |
| }; |
| |
| class C : public RefCounted<C> { |
| private: |
| Persistent<B> m_b; |
| }; |
| |
| class D : public A { |
| public: |
| virtual void Trace(Visitor*); |
| private: |
| RefPtr<C> m_c; |
| }; |
| |
| } |
| |
| #endif |