v8
10.1.124 (node 18.2.0)
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sentinel-pointer.h
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// Copyright 2021 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_SENTINEL_POINTER_H_
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#
define
INCLUDE_CPPGC_SENTINEL_POINTER_H_
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#
include
<
cstdint
>
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namespace
cppgc
{
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namespace
internal
{
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// Special tag type used to denote some sentinel member. The semantics of the
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// sentinel is defined by the embedder.
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struct
SentinelPointer
{
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template
<
typename
T>
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operator
T*()
const
{
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static
constexpr
intptr_t kSentinelValue = 1;
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return
reinterpret_cast
<T*>(kSentinelValue);
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}
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// Hidden friends.
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friend
bool
operator
==(
SentinelPointer
,
SentinelPointer
) {
return
true
; }
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friend
bool
operator
!=(
SentinelPointer
,
SentinelPointer
) {
return
false
; }
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};
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}
// namespace internal
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constexpr
internal
::
SentinelPointer
kSentinelPointer
;
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}
// namespace cppgc
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#
endif
// INCLUDE_CPPGC_SENTINEL_POINTER_H_
include
cppgc
sentinel-pointer.h
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