| // Copyright 2020 the V8 project authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style license that can be | |
| // found in the LICENSE file. | |
| namespace cppgc { | |
| /** | |
| * An ephemeron pair is used to conditionally retain an object. | |
| * The `value` will be kept alive only if the `key` is alive. | |
| */ | |
| template <typename K, typename V> | |
| struct EphemeronPair { | |
| EphemeronPair(K* k, V* v) : key(k), value(v) {} | |
| WeakMember<K> key; | |
| Member<V> value; | |
| void ClearValueIfKeyIsDead(const LivenessBroker& broker) { | |
| if (!broker.IsHeapObjectAlive(key)) value = nullptr; | |
| } | |
| }; | |
| } // namespace cppgc | |