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 BASE_REQUIRES_TRACING_H_ 6 #define BASE_REQUIRES_TRACING_H_ 7 8 #include "heap/stubs.h" 9 10 namespace blink { 11 12 class A : public GarbageCollected<A> { 13 public: 14 virtual void Trace(Visitor*); 15 }; 16 17 class B : public A { 18 // Does not need Trace 19 }; 20 21 class C : public B { 22 public: 23 void Trace(Visitor*); 24 private: 25 Member<A> m_a; 26 }; 27 28 class D : public C { 29 public: 30 void Trace(Visitor*); 31 private: 32 Member<A> m_a; 33 }; 34 35 } 36 37 #endif 38
