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      1 // Copyright 2015 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 TRACEIMPL_OVERLOADED_H_
      6 #define TRACEIMPL_OVERLOADED_H_
      7 
      8 #include "heap/stubs.h"
      9 
     10 namespace blink {
     11 
     12 class X : public GarbageCollected<X> {
     13  public:
     14   void Trace(Visitor*) {}
     15 };
     16 
     17 class InlinedBase : public GarbageCollected<InlinedBase> {
     18  public:
     19   virtual void Trace(Visitor* visitor) { visitor->Trace(x_base_); }
     20 
     21  private:
     22   Member<X> x_base_;
     23 };
     24 
     25 class InlinedDerived : public InlinedBase {
     26  public:
     27   void Trace(Visitor* visitor) override {
     28     visitor->Trace(x_derived_);
     29     InlinedBase::Trace(visitor);
     30   }
     31 
     32   Member<X> x_derived_;
     33 };
     34 
     35 class ExternBase : public GarbageCollected<ExternBase> {
     36  public:
     37   virtual void Trace(Visitor*);
     38 
     39  private:
     40   Member<X> x_base_;
     41 };
     42 
     43 class ExternDerived : public ExternBase {
     44  public:
     45   void Trace(Visitor*) override;
     46 
     47  private:
     48   Member<X> x_derived_;
     49 };
     50 
     51 }
     52 
     53 #endif  // TRACEIMPL_OVERLOADED_H_
     54