DEENESPTFRRUARHIKOZHNL

类 ara::shwa::Accessor

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[AP_SWS_SHWA_00001] 原文尚未导入 Upstream: RS_SHWA_00017, RS_SHWA_00009

template <typename DataT, int Dimensions = 1, AccessMode AccessMode Type = AccessMode::kRead, Target AccessTargetType = Target::kDevice, typename AllocatorT = BufferAllocator<std::remove_const_t<DataT>>> class Accessor final {...};

Die Spezifikation definiert diesen Klassentyp mit der gezeigten Schnittstelle.

Header-Datei#include "ara/shwa/accessor.h"
Scopenamespace ara::shwa

用户指南人工智能生成

实现对缓冲区内存区域的类型化、受控读写访问。
AI 生成 未审核 模型: gemini-3.8-flash-medium · 推理强度: medium · 温度: 不可控 · 提示词: d5d168d169f4 来源 未决问题(2)
译自德文指南gemini-3.8-flash-low · 2026-10-13 · 德文原文

实现对缓冲区内存区域的类型化、受控读写访问。

该模板类实现对底层数据缓冲区已分配内存的类型化受控访问。实例化仅通过静态工厂方法进行,这些方法以唯一指针的形式返回实例([AP_SWS_SHWA_00007])。在运行时,可以通过类型安全的读写操作或通过下标运算符来处理数据([AP_SWS_SHWA_00011])。所有复制和移动操作均被禁止,而单个数据操作则受特定线程安全和错误处理要求的约束。

上下文

模板类 ara::shwa::Accessor 构成了 AUTOSAR Adaptive Platform 中对共享内存缓冲区进行类型化内存访问的核心访问接口。它封装了对底层 ara::shwa::Buffer 的寻址和访问逻辑,并通过数据类型(DataT)、维度(Dimensions)、访问模式(AccessModeType)、目标设备(AccessTargetType)以及所使用的内存分配器(AllocatorT)对其进行静态参数化。在高级场景中,该类集成了一个 TaskHandler,据推测其用于控制缓冲区环境中的处理任务。 问题 Q-552022fbf949a1f0 (未决)

在该模块内部,该类与三个核心交互伙伴协同工作:

  • 应用程序 / 调用方:通过工厂接口请求实例,并通过方法或运算符执行读写操作。
  • ara::shwa::Buffer:提供已分配的内存区域,并在创建 Accessor 时作为引用传递给它([AP_SWS_SHWA_00007])。
  • TaskHandler:根据需要在创建期间进行注册,以协调缓冲区处理中的任务([AP_SWS_SHWA_00008])。
diag_kontext Anwendung Anwendung ara::shwa::Accessor ara::shwa::Accessor Anwendung->ara::shwa::Accessor 使用 ara::shwa::Buffer ara::shwa::Buffer ara::shwa::Accessor->ara::shwa::Buffer referenziert TaskHandler TaskHandler ara::shwa::Accessor->TaskHandler 协调配合:

上下文图:ara::shwa::Accessor 的交互伙伴。来源:[AP_SWS_SHWA_00007]、[AP_SWS_SHWA_00008]

生命周期

ara::shwa::Accessor 的生命周期受到严格的语义限制,这些限制防止了访问实例被不受控地复制或移动。默认构造函数被显式删除([AP_SWS_SHWA_00002])。同样,拷贝构造函数([AP_SWS_SHWA_00003])和移动构造函数([AP_SWS_SHWA_00005])以及所有拷贝和移动赋值运算符均被声明为已删除([AP_SWS_SHWA_00004]、[AP_SWS_SHWA_00006])。因此,排除了在栈上的直接实例化或值语义。

新实例的创建完全通过静态工厂方法 Create 进行([AP_SWS_SHWA_00007]、[AP_SWS_SHWA_00008])。它返回一个 ara::core::Result<std::unique_ptr<Accessor>>,从而将所有权独占转移给调用方。一旦拥有所有权的 std::unique_ptr 离开其作用域,对象就会被自动销毁。创建方法被规范为线程安全(thread-safe)且异常安全(exception safe)([AP_SWS_SHWA_00007]、[AP_SWS_SHWA_00008])。

关于运行中的并发性,显式访问方法 Get([AP_SWS_SHWA_00012])和 Set([AP_SWS_SHWA_00011])被归类为线程安全。相比之下,通过 operator[]([AP_SWS_SHWA_00009]、[AP_SWS_SHWA_00010])进行的索引访问以及通过 HasProperty([AP_SWS_SHWA_00015])和 GetProperty([AP_SWS_SHWA_00016])进行的属性查询不是线程安全的,需要应用程序端进行同步。

使用路径

常规使用流程分为对象创建、可选的属性检查以及后续对缓冲区的读写操作:

  1. 通过工厂实例化:应用程序调用 Accessor::Create 并传入 ara::shwa::Buffer 的引用以及可选的配置属性和 TaskHandler([AP_SWS_SHWA_00007]、[AP_SWS_SHWA_00008])。在检查 ara::core::Result 之后,应用程序接管 std::unique_ptr<Accessor>。
  2. 评估属性:通过模板方法 HasProperty<PropertyT>() 可以查询是否存在特定特征([AP_SWS_SHWA_00015])。随后使用 GetProperty<PropertyT>() 读取存在的特征([AP_SWS_SHWA_00016])。
  3. 执行数据访问:实际的数据交换提供了两个接口路径:
    • 基于方法的访问:写入操作通过 Set(index, value)([AP_SWS_SHWA_00011])进行,读取操作通过 Get(index)([AP_SWS_SHWA_00012])进行,分别通过维度标识符(Id<Dimensions>)进行寻址。
    • 基于运算符的访问:下标运算符 operator[] 允许通过 Id<Dimensions>([AP_SWS_SHWA_00009])或类型为 std::size_t 的线性偏移量([AP_SWS_SHWA_00010])进行直接寻址。返回类型 ReferenceT 在读取访问时解析为 const DataT&,在写入访问时解析为 DataT&([AP_SWS_SHWA_00014])。
Accessor 的典型使用路径应用ara::shwa::Accessorara::shwa::BufferCreate(bufferRef, propList)检查内存完整性Speicher bereitResult<std::unique_ptr<Accessor>>Use Case: 属性检查HasProperty<PropertyT>()boolUse Case: DatenzugriffSet(index, value)Schreibe DatumBestaetigungResult<void>Get(index)Lese DatumWert DataTResult<DataT>

时序图:通过 Accessor 进行缓冲区交互的典型调用序列。来源:[AP_SWS_SHWA_00007]、[AP_SWS_SHWA_00011]、[AP_SWS_SHWA_00012]、[AP_SWS_SHWA_00015]

错误场景

失败的操作通过 ara::core::Result 并使用来自 ShwaErrorCode 的错误代码来映射:

关于异常安全性,Create、HasProperty 和 GetProperty 用 noexcept 声明,并被规范为异常安全([AP_SWS_SHWA_00007]、[AP_SWS_SHWA_00008]、[AP_SWS_SHWA_00015]、[AP_SWS_SHWA_00016])。相反,数据访问操作 Get、Set 以及 operator[] 被视为非异常安全(not exception safe)([AP_SWS_SHWA_00009]、[AP_SWS_SHWA_00010]、[AP_SWS_SHWA_00011]、[AP_SWS_SHWA_00012])。

本指南基于 AUTOSAR Adaptive Platform R25-11 的 ara::shwa::Accessor 规范,并通过自动化方式生成。

成员图

构造函数和析构函数

1

类型别名

1

详细视图

请在大纲中选择一个条目。

构造函数和析构函数

Accessor 函数 3

Die Spezifikation definiert diese Deklaration mit der in der Signatur ausgewiesenen Semantik.

重载 Accessor 3
Accessor ()=delete; AP_SWS_SHWA_00002
Accessor (Accessor &&)=delete; AP_SWS_SHWA_00005
Accessor (Accessor const &)=delete; AP_SWS_SHWA_00003

方法

Create 函数 2

Erzeugt beziehungsweise liefert das in der Signatur beschriebene Objekt oder Ergebnis über den angegebenen Factory-Pfad.

重载 Create 2
static ara::core::Result< std::unique_ptr< Accessor > > Create (const std::unique_ptr< ara::shwa::Buffer< DataT, Dimensions, AllocatorT > > &bufferRef, TaskHandler &handler, const PropertyList &propList={}) noexcept; AP_SWS_SHWA_00008
static ara::core::Result< std::unique_ptr< Accessor > > Create (const std::unique_ptr< ara::shwa::Buffer< DataT, Dimensions, AllocatorT > > &bufferRef, const PropertyList &propList={}) noexcept; AP_SWS_SHWA_00007
Get 函数

Liest die durch die Signatur bezeichnete Information oder Eigenschaft aus dem Objekt.

ara::core::Result< DataT > Get (Id< Dimensions > index);

Liest die durch die Signatur bezeichnete Information oder Eigenschaft aus dem Objekt.

template <typename PropertyT> ara::core::Result< PropertyT > GetProperty () const noexcept;

Prüft, ob die angeforderte Eigenschaft verfügbar ist.

template <typename PropertyT> bool HasProperty () const noexcept;
Set 函数

Schreibt den übergebenen Wert an die durch die Signatur bestimmte Stelle.

ara::core::Result< void > Set (Id< Dimensions > index, DataT value);

运算符

operator= 函数 2

Stellt die in der Signatur ausgewiesene Index- beziehungsweise Zuweisungsoperation bereit.

重载 = 2
Accessor & operator= (const Accessor &)=delete; AP_SWS_SHWA_00004
Accessor & operator= (Accessor &&)=delete; AP_SWS_SHWA_00006
operator[] 函数 2

Stellt die in der Signatur ausgewiesene Index- beziehungsweise Zuweisungsoperation bereit.

重载 [] 2
ReferenceT operator[] (Id< Dimensions > index) const; AP_SWS_SHWA_00009
ReferenceT operator[] (std::size_t index) const; AP_SWS_SHWA_00010

类型别名

Reference T 类型别名

Der Typ-Alias ordnet den in der Signatur angegebenen Namen dem dargestellten Typ zu.

using ReferenceT = std::conditional_t<AccessModeType == AccessMode::k Read, const DataT&, DataT&>;

详细信息

类型别名 Reference T [AP_SWS_SHWA_00014] Upstream: RS_SHWA_00017

using ReferenceT = std::conditional_t<AccessModeType == AccessMode::k Read, const DataT&, DataT&>;

Der Typ-Alias ordnet den in der Signatur angegebenen Namen dem dargestellten Typ zu.

Scopeclass ara::shwa::Accessor

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Record
AUTOSAR/AP/record/AP_SWS_SHWA_00014
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valid/unmigrated
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AUTOSAR/AP/record/AP_SWS_SHWA_00014@rel:R25-11#aaf3a526
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aaf3a526
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函数 Accessor [AP_SWS_SHWA_00002] Upstream: RS_SHWA_00017

Accessor ()=delete;

Die Spezifikation definiert diese Deklaration mit der in der Signatur ausgewiesenen Semantik.

Scopeclass ara::shwa::Accessor

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函数 Accessor [AP_SWS_SHWA_00005] Upstream: RS_SHWA_00017

Accessor (Accessor &&)=delete;

Die Spezifikation definiert diese Deklaration mit der in der Signatur ausgewiesenen Semantik.

Scopeclass ara::shwa::Accessor

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函数 operator= [AP_SWS_SHWA_00004] Upstream: RS_SHWA_00017

Accessor & operator= (const Accessor &)=delete;

Stellt die in der Signatur ausgewiesene Index- beziehungsweise Zuweisungsoperation bereit.

Scopeclass ara::shwa::Accessor

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函数 operator= [AP_SWS_SHWA_00006] Upstream: RS_SHWA_00017

Accessor & operator= (Accessor &&)=delete;

Stellt die in der Signatur ausgewiesene Index- beziehungsweise Zuweisungsoperation bereit.

Scopeclass ara::shwa::Accessor

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AUTOSAR/AP/record/AP_SWS_SHWA_00006
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函数 Accessor [AP_SWS_SHWA_00003] Upstream: RS_SHWA_00017

Accessor (Accessor const &)=delete;

Die Spezifikation definiert diese Deklaration mit der in der Signatur ausgewiesenen Semantik.

Scopeclass ara::shwa::Accessor

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函数 Create [AP_SWS_SHWA_00008] Upstream: RS_SHWA_00017, RS_SHWA_00007

static ara::core::Result< std::unique_ptr< Accessor > > Create (const std::unique_ptr< ara::shwa::Buffer< DataT, Dimensions, AllocatorT > > &bufferRef, TaskHandler &handler, const PropertyList &propList={}) noexcept;

Erzeugt beziehungsweise liefert das in der Signatur beschriebene Objekt oder Ergebnis über den angegebenen Factory-Pfad.

Scopeclass ara::shwa::Accessor
Thread Safetythread-safe rollback_semantics ShwaErrorCode::k AccessorFailure Invalid use or construction of accessors no_rollback_semantics
Exception Safetyexception safe
ErrorsShwaErrorCode::k IntegrityCorrupted The structural integrity of the memory allocated by Buffer could not be established

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AUTOSAR/AP/record/AP_SWS_SHWA_00008
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函数 Create [AP_SWS_SHWA_00007] Upstream: RS_SHWA_00017, RS_SHWA_00007

static ara::core::Result< std::unique_ptr< Accessor > > Create (const std::unique_ptr< ara::shwa::Buffer< DataT, Dimensions, AllocatorT > > &bufferRef, const PropertyList &propList={}) noexcept;

Erzeugt beziehungsweise liefert das in der Signatur beschriebene Objekt oder Ergebnis über den angegebenen Factory-Pfad.

Scopeclass ara::shwa::Accessor
Thread Safetythread-safe rollback_semantics ShwaErrorCode::k AccessorFailure Invalid use or construction of accessors no_rollback_semantics
Exception Safetyexception safe
ErrorsShwaErrorCode::k IntegrityCorrupted The structural integrity of the memory allocated by Buffer could not be established

Request a governed re-review of this record. The record is not changed immediately.

Record
AUTOSAR/AP/record/AP_SWS_SHWA_00007
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AUTOSAR/AP/record/AP_SWS_SHWA_00007@rel:R25-11#b36772fe
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函数 Get [AP_SWS_SHWA_00012] Upstream: RS_SHWA_00017, RS_SHWA_00007

ara::core::Result< DataT > Get (Id< Dimensions > index);

Liest die durch die Signatur bezeichnete Information oder Eigenschaft aus dem Objekt.

Scopeclass ara::shwa::Accessor
Thread Safetythread-safe rollback_semantics ShwaErrorCode::kInvalid Index The operation could not be performed because no initial value is available rollback_semantics
Exception Safetynot exception safe
ErrorsShwaErrorCode::k ResourceBusy The operation could not be performed because the resource is currently busy.

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AUTOSAR/AP/record/AP_SWS_SHWA_00012
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AUTOSAR/AP/record/AP_SWS_SHWA_00012@rel:R25-11#22fd9c7f
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https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_SafeHardwareAcceleration.pdf#nameddest=AP_SWS_SHWA_00012
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DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill

函数 GetProperty [AP_SWS_SHWA_00016] Upstream: RS_SHWA_00001, RS_SHWA_00007

template <typename PropertyT> ara::core::Result< PropertyT > GetProperty () const noexcept;

Liest die durch die Signatur bezeichnete Information oder Eigenschaft aus dem Objekt.

Scopeclass ara::shwa::Accessor
Thread Safetynot thread-safe rollback_semantics
Exception Safetyexception safe
ErrorsShwaErrorCode::k FeatureNotSupported Used when a requested feature isn’t supported

Request a governed re-review of this record. The record is not changed immediately.

Record
AUTOSAR/AP/record/AP_SWS_SHWA_00016
Status
valid/unmigrated
Version
AUTOSAR/AP/record/AP_SWS_SHWA_00016@rel:R25-11#d1c7cac9
Content hash
d1c7cac9
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_SafeHardwareAcceleration.pdf#nameddest=AP_SWS_SHWA_00016
Status: valid/unmigrated Version: rel:R25-11#7e50eb6e Versionshistorie & Revisions (1 transition)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/AP_SWS_SHWA_00016@rel:R25-11#7e50eb6e
Point-in-Time History:
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill

函数 HasProperty [AP_SWS_SHWA_00015] Upstream: RS_SHWA_00001, RS_SHWA_00007

template <typename PropertyT> bool HasProperty () const noexcept;

Prüft, ob die angeforderte Eigenschaft verfügbar ist.

Scopeclass ara::shwa::Accessor
Thread Safetynot thread-safe
Exception Safetyexception safe

Request a governed re-review of this record. The record is not changed immediately.

Record
AUTOSAR/AP/record/AP_SWS_SHWA_00015
Status
valid/unmigrated
Version
AUTOSAR/AP/record/AP_SWS_SHWA_00015@rel:R25-11#2fe95a29
Content hash
2fe95a29
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_SafeHardwareAcceleration.pdf#nameddest=AP_SWS_SHWA_00015
Status: valid/unmigrated Version: rel:R25-11#c1f7c4c8 Versionshistorie & Revisions (1 transition)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/AP_SWS_SHWA_00015@rel:R25-11#c1f7c4c8
Point-in-Time History:
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill

函数 Set [AP_SWS_SHWA_00011] Upstream: RS_SHWA_00017, RS_SHWA_00007

ara::core::Result< void > Set (Id< Dimensions > index, DataT value);

Schreibt den übergebenen Wert an die durch die Signatur bestimmte Stelle.

Scopeclass ara::shwa::Accessor
Thread Safetythread-safe
Exception Safetynot exception safe
ErrorsShwaErrorCode::kInvalid Index no_rollback_semantics The operation could not be performed because no initial value is available no_rollback_semantics ShwaErrorCode::kInvalid AccessMode Opening a file failed because the requested combination of Open Modes is invalid no_rollback_semantics ShwaErrorCode::k IntegrityCorrupted The structural integrity of the memory allocated by Buffer could not be established rollback_semantics ShwaErrorCode::k ResourceBusy The operation could not be performed because the resource is currently busy.

Request a governed re-review of this record. The record is not changed immediately.

Record
AUTOSAR/AP/record/AP_SWS_SHWA_00011
Status
valid/unmigrated
Version
AUTOSAR/AP/record/AP_SWS_SHWA_00011@rel:R25-11#82eb0f85
Content hash
82eb0f85
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_SafeHardwareAcceleration.pdf#nameddest=AP_SWS_SHWA_00011
Status: valid/unmigrated Version: rel:R25-11#9a134685 Versionshistorie & Revisions (1 transition)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/AP_SWS_SHWA_00011@rel:R25-11#9a134685
Point-in-Time History:
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill

函数 operator[] [AP_SWS_SHWA_00009] Upstream: RS_SHWA_00017

ReferenceT operator[] (Id< Dimensions > index) const;

Stellt die in der Signatur ausgewiesene Index- beziehungsweise Zuweisungsoperation bereit.

Scopeclass ara::shwa::Accessor
Thread Safetynot thread-safe
Exception Safetynot exception safe

Request a governed re-review of this record. The record is not changed immediately.

Record
AUTOSAR/AP/record/AP_SWS_SHWA_00009
Status
valid/unmigrated
Version
AUTOSAR/AP/record/AP_SWS_SHWA_00009@rel:R25-11#8d8ac14a
Content hash
8d8ac14a
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_SafeHardwareAcceleration.pdf#nameddest=AP_SWS_SHWA_00009
Status: valid/unmigrated Version: rel:R25-11#e25c660d Versionshistorie & Revisions (1 transition)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/AP_SWS_SHWA_00009@rel:R25-11#e25c660d
Point-in-Time History:
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill

函数 operator[] [AP_SWS_SHWA_00010] Upstream: RS_SHWA_00017

ReferenceT operator[] (std::size_t index) const;

Stellt die in der Signatur ausgewiesene Index- beziehungsweise Zuweisungsoperation bereit.

Scopeclass ara::shwa::Accessor
Thread Safetynot thread-safe
Exception Safetynot exception safe

Request a governed re-review of this record. The record is not changed immediately.

Record
AUTOSAR/AP/record/AP_SWS_SHWA_00010
Status
valid/unmigrated
Version
AUTOSAR/AP/record/AP_SWS_SHWA_00010@rel:R25-11#70847735
Content hash
70847735
Source
https://www.autosar.org/fileadmin/standards/R25-11/AP/AUTOSAR_AP_SWS_SafeHardwareAcceleration.pdf#nameddest=AP_SWS_SHWA_00010
Status: valid/unmigrated Version: rel:R25-11#a0626adf Versionshistorie & Revisions (1 transition)
Current State
valid/unmigrated
Reason
mechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record
Campaign
2026-08-13-status-backfill
Active Version
AUTOSAR/AP/record/AP_SWS_SHWA_00010@rel:R25-11#a0626adf
Point-in-Time History:
DateActorTransitionReason / RationaleCampaign
2026-08-13toolnone → valid/unmigratedmechanically backfilled by migriere_status_backfill.py -- no per-field curation history exists yet for this record2026-08-13-status-backfill