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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 CLASS_REQUIRES_TRACE_METHOD_H_
      6 #define CLASS_REQUIRES_TRACE_METHOD_H_
      7 
      8 #include "heap/stubs.h"
      9 
     10 namespace blink {
     11 
     12 class HeapObject;
     13 
     14 class PartObject {
     15     DISALLOW_NEW();
     16 private:
     17     Member<HeapObject> m_obj;
     18 };
     19 
     20 class HeapObject : public GarbageCollected<HeapObject> {
     21 private:
     22     PartObject m_part;
     23 };
     24 
     25 class Mixin : public GarbageCollectedMixin {
     26 public:
     27   virtual void Trace(Visitor*) override;
     28   Member<Mixin> m_self;
     29 };
     30 
     31 class HeapObjectMixin : public GarbageCollected<HeapObjectMixin>, public Mixin {
     32   USING_GARBAGE_COLLECTED_MIXIN(HeapObjectMixin);
     33 };
     34 
     35 class Mixin2 : public Mixin {
     36 public:
     37   virtual void Trace(Visitor*) override;
     38 };
     39 
     40 class HeapObjectMixin2
     41     : public GarbageCollected<HeapObjectMixin2>, public Mixin2 {
     42   USING_GARBAGE_COLLECTED_MIXIN(HeapObjectMixin2);
     43 };
     44 
     45 class Mixin3 : public Mixin {
     46 public:
     47   virtual void Trace(Visitor*) override;
     48 };
     49 
     50 class HeapObjectMixin3
     51     : public GarbageCollected<HeapObjectMixin3>, public Mixin {
     52   USING_GARBAGE_COLLECTED_MIXIN(HeapObjectMixin2);
     53 public:
     54   virtual void Trace(Visitor*) override;
     55 };
     56 
     57 }
     58 
     59 #endif
     60