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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 TRACE_TEMPLATED_SUPER_H_
      6 #define TRACE_TEMPLATED_SUPER_H_
      7 
      8 #include "heap/stubs.h"
      9 
     10 namespace blink {
     11 
     12 class HeapObject;
     13 
     14 class Mixin : public GarbageCollectedMixin {
     15 public:
     16     virtual void trace(Visitor*) { }
     17 };
     18 
     19 template<typename T>
     20 class Super : public GarbageCollected<Super<T> >, public Mixin {
     21     USING_GARBAGE_COLLECTED_MIXIN(Super);
     22 public:
     23     virtual void trace(Visitor*);
     24     void clearWeakMembers(Visitor*);
     25 private:
     26     Member<HeapObject> m_obj;
     27     WeakMember<HeapObject> m_weak;
     28 };
     29 
     30 template<typename T>
     31 class Sub : public Super<T> {
     32 public:
     33     virtual void trace(Visitor* visitor);
     34 private:
     35     Member<HeapObject> m_obj;
     36 };
     37 
     38 class HeapObject : public Sub<HeapObject> {
     39 public:
     40     virtual void trace(Visitor*);
     41 private:
     42     Member<HeapObject> m_obj;
     43 };
     44 
     45 }
     46 
     47 #endif
     48