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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 TEMPLATED_CLASS_WITH_LOCAL_CLASS_REQUIRES_TRACE_H
      6 #define TEMPLATED_CLASS_WITH_LOCAL_CLASS_REQUIRES_TRACE_H
      7 
      8 #include "heap/stubs.h"
      9 
     10 namespace blink {
     11 
     12 class NonHeapObject { };
     13 
     14 class HeapObject : public GarbageCollected<HeapObject> {
     15 public:
     16     HeapObject() { }
     17 
     18     void Trace(Visitor*) { }
     19 };
     20 
     21 template<typename T>
     22 class TemplatedObject final
     23     : public GarbageCollectedFinalized<TemplatedObject<T> > {
     24 public:
     25     TemplatedObject(T*)
     26     {
     27     }
     28 
     29     void Trace(Visitor*);
     30 
     31 private:
     32     class Local final : public GarbageCollected<Local> {
     33     public:
     34         void Trace(Visitor* visitor)
     35         {
     36             visitor->Trace(m_heapObject);
     37             visitor->Trace(m_object);
     38         }
     39     private:
     40         Member<HeapObject> m_heapObject;
     41         OwnPtr<HeapObject> m_object;
     42     };
     43 
     44     Member<Local> m_local;
     45     Member<T> m_memberRef;
     46     OwnPtr<T> m_ownRef;
     47 };
     48 
     49 } // namespace blink
     50 
     51 #endif // TEMPLATED_CLASS_WITH_LOCAL_CLASS_REQUIRES_TRACE_H
     52 
     53