| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef OPTIONAL_GC_OBJECT_H_ |
| #define OPTIONAL_GC_OBJECT_H_ |
| |
| #include "heap/stubs.h" |
| |
| namespace blink { |
| |
| class Base : public GarbageCollected<Base> { |
| public: |
| virtual void Trace(Visitor*) const {} |
| }; |
| |
| class Derived : public Base { |
| public: |
| void Trace(Visitor* visitor) const override { Base::Trace(visitor); } |
| }; |
| |
| class Mixin : public GarbageCollectedMixin { |
| public: |
| void Trace(Visitor*) const {} |
| }; |
| |
| } // namespace blink |
| |
| #endif // OPTIONAL_GC_OBJECT_H_ |