v8
8.6.395 (node 15.0.1)
V8 is Google's open source JavaScript engine
custom-space.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_CUSTOM_SPACE_H_
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#
define
INCLUDE_CPPGC_CUSTOM_SPACE_H_
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#
include
<
stddef
.
h
>
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namespace
cppgc
{
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struct
CustomSpaceIndex
{
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CustomSpaceIndex
(size_t value) :
value
(value) {}
// NOLINT
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size_t
value
;
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};
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/**
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* Top-level base class for custom spaces. Users must inherit from CustomSpace
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* below.
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*/
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class
CustomSpaceBase
{
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public
:
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virtual
~
CustomSpaceBase
() =
default
;
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virtual
CustomSpaceIndex
GetCustomSpaceIndex
()
const
= 0;
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};
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/**
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* Base class custom spaces should directly inherit from. The class inheriting
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* from CustomSpace must define kSpaceIndex as unique space index. These
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* indices need for form a sequence starting at 0.
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*
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* Example:
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* \code
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* class CustomSpace1 : public CustomSpace<CustomSpace1> {
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* public:
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* static constexpr CustomSpaceIndex kSpaceIndex = 0;
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* };
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* class CustomSpace2 : public CustomSpace<CustomSpace2> {
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* public:
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* static constexpr CustomSpaceIndex kSpaceIndex = 1;
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* };
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* \endcode
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*/
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template
<
typename
ConcreteCustomSpace>
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class
CustomSpace
:
public
CustomSpaceBase
{
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public
:
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CustomSpaceIndex
GetCustomSpaceIndex
()
const
final
{
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return
ConcreteCustomSpace::kSpaceIndex;
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}
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};
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/**
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* User-overridable trait that allows pinning types to custom spaces.
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*/
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template
<
typename
T,
typename
=
void
>
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struct
SpaceTrait
{
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using
Space =
void
;
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};
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}
// namespace cppgc
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#
endif
// INCLUDE_CPPGC_CUSTOM_SPACE_H_
include
cppgc
custom-space.h
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