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10.1.124 (node 18.2.0)
V8 is Google's open source JavaScript engine
ephemeron-pair.h
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// Copyright 2020 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#
ifndef
INCLUDE_CPPGC_EPHEMERON_PAIR_H_
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#
define
INCLUDE_CPPGC_EPHEMERON_PAIR_H_
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#
include
"cppgc/liveness-broker.h"
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#
include
"cppgc/member.h"
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namespace
cppgc
{
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/**
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* An ephemeron pair is used to conditionally retain an object.
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* The `value` will be kept alive only if the `key` is alive.
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*/
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template
<
typename
K,
typename
V>
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struct
EphemeronPair
{
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EphemeronPair
(K* k, V* v) :
key
(k),
value
(v) {}
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WeakMember<K>
key
;
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Member<V>
value
;
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void
ClearValueIfKeyIsDead
(
const
LivenessBroker& broker) {
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if
(!broker.IsHeapObjectAlive(
key
))
value
=
nullptr
;
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}
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};
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}
// namespace cppgc
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#
endif
// INCLUDE_CPPGC_EPHEMERON_PAIR_H_
include
cppgc
ephemeron-pair.h
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