1. Epic GamesDeveloper
  3. FAttributeStorage

FAttributeStorage

This class is a Key/Value storage inside a TArray64.

API > API/Runtime > API/Runtime/InterchangeCore

This class is a Key/Value storage inside a TArray64. The keys are of type FAttributeKey, which is an FString. Each key is unique and has only one value. The value can be of any type contained in EAttributeTypes.

The storage is multi-thread safe. It uses a mutex to lock the storage for every read/write operation. The hash of the storage is deterministic because it sorts the attributes before calculating the hash.

   
Name FAttributeStorage
Type class
Header File /Engine/Source/Runtime/Interchange/Core/Public/Types/AttributeStorage.h
Include Path #include "Types/AttributeStorage.h"

Syntax

class FAttributeStorage

Constructors

Name Remarks Include Path Unreal Specifiers
  Types/AttributeStorage.h  
  Types/AttributeStorage.h  

Classes

Name Remarks
TAttributeHandle  

Structs

Name Remarks
FAttributeAllocationInfo Structure used to hold the attribute information stored in the attribute allocation table.

Functions

Public

Name Remarks Include Path Unreal Specifiers

bool ContainAttribute ( const FAttributeKey& ElementAttributeKey
) const

 Return true if the attribute key points to an existing attribute in the storage. Types/AttributeStorage.h  

EAttributeStorageResult GetAttribute ( const FAttributeKey& ElementAttributeKey,
B& OutValue
) const

 Redirect TEnumAsByte instantiations to underlying type. Types/AttributeStorage.h  

EAttributeStorageResult GetAttribute ( const FAttributeKey& ElementAttributeKey,
ArrayOfB& OutValue
) const

 Redirect TArray instantiations to TArray Types/AttributeStorage.h  

EAttributeStorageResult GetAttribute ( const FAttributeKey& ElementAttributeKey,
ArrayOfE& OutValue
) const

 Redirect TArray instantiations to TArray Types/AttributeStorage.h  

EAttributeStorageResult GetAttribute ( const FAttributeKey& ElementAttributeKey,
T& OutValue
) const

 Retrieve a copy of an attribute value. Types/AttributeStorage.h  

EAttributeStorageResult GetAttribute ( const FAttributeKey& ElementAttributeKey,
E& OutValue
) const

 Redirect enum instantiations to underlying type. Types/AttributeStorage.h  

TAttributeHandle< ArrayOfB > GetAttributeHandle ( const FAttributeKey& ElementAttributeKey
) const

 Redirect TArray instantiations to TArray Types/AttributeStorage.h  

TAttributeHandle< ArrayOfE > GetAttributeHandle ( const FAttributeKey& ElementAttributeKey
) const

 Redirect TArray instantiations to TArray Types/AttributeStorage.h  

TAttributeHandle< B > GetAttributeHandle ( const FAttributeKey& ElementAttributeKey
) const

 Redirect TEnumAsByte instantiations to underlying type. Types/AttributeStorage.h  

TAttributeHandle< E > GetAttributeHandle ( const FAttributeKey& ElementAttributeKey
) const

 Redirect enum instantiations to underlying type. Types/AttributeStorage.h  

TAttributeHandle< T > GetAttributeHandle ( const FAttributeKey& ElementAttributeKey
) const

 Return an attribute handle for the specified attribute. Types/AttributeStorage.h  

bool GetAttributeHash ( const FAttributeKey& ElementAttributeKey,
FGuid& OutGuid
) const

 This function fills the OutGuid with the hash of the specified attribute. Types/AttributeStorage.h  

FGuid GetAttributeHash ( const FAttributeKey& ElementAttributeKey
) const

 Return an FGuid built from the FSHA1 of the specified attribute data. Types/AttributeStorage.h  

void GetAttributeKeys ( TArray< FAttributeKey >& AttributeKeys
) const

 Retrieve the array of keys that can be used to iterate and do reflection on the storage content. Types/AttributeStorage.h  

EAttributeTypes GetAttributeType ( const FAttributeKey& ElementAttributeKey
) const

 Return the attribute type if the key exists, or None if the key is missing. Types/AttributeStorage.h  

float GetDefragRatio()

   Types/AttributeStorage.h  
Return an FGuid built from the FSHA1 of all the attribute data contained in the node. Types/AttributeStorage.h  

EAttributeStorageResult RegisterAttribute ( const FAttributeKey& ElementAttributeKey,
const T& DefaultValue,
EAttributeProperty AttributeProperty
)

 Register an attribute in the storage. Types/AttributeStorage.h  

EAttributeStorageResult RegisterAttribute ( const FAttributeKey& ElementAttributeKey,
const E& DefaultValue,
EAttributeProperty AttributeProperty
)

 Redirect enum instantiations to underlying type. Types/AttributeStorage.h  

EAttributeStorageResult RegisterAttribute ( const FAttributeKey& ElementAttributeKey,
const B& DefaultValue,
EAttributeProperty AttributeProperty
)

 Redirect TEnumAsByte instantiations to underlying type. Types/AttributeStorage.h  

EAttributeStorageResult RegisterAttribute ( const FAttributeKey& ElementAttributeKey,
const T& DefaultValue,
EAttributeProperty AttributeProperty
)

 Redirect TArray instantiations to TArray Types/AttributeStorage.h  

EAttributeStorageResult RegisterAttribute ( const FAttributeKey& ElementAttributeKey,
const T& DefaultValue,
EAttributeProperty AttributeProperty
)

 Redirect TArray instantiations to TArray Types/AttributeStorage.h  

void Reserve ( int64 NewAttributeCount,
int64 NewStorageSize
)

 Reserve the allocation table and the storage data. Types/AttributeStorage.h  

void SetDefragRatio ( const float InDefragRatio
)

 Set the defrag ratio. See GetDefragRatio() for the defrag documentation. Types/AttributeStorage.h  
Remove an attribute from the storage. Types/AttributeStorage.h  

Protected

Name Remarks Include Path Unreal Specifiers

bool AreAllocationInfosEqual ( const FAttributeKey& BaseKey,
const FAttributeAllocationInfo& BaseInfo,
const FAttributeStorage& VersionStorage,
const FAttributeAllocationInfo& VersionInfo
) const

 Compare two allocation infos. Returns true if they are equal Types/AttributeStorage.h  

void DefragInternal()

 Defrag the storage by using memmove on the attribute store after a hole in the storage. Types/AttributeStorage.h  

EAttributeStorageResult GenericArrayGetAttribute ( const FAttributeKey& ElementAttributeKey,
ArrayType& OutValue
) const

   Types/AttributeStorage.h  

const FStringView GetFStringViewAttributeFromStorage ( const uint8* StorageData,
const FAttributeAllocationInfo* AttributeAllocationInfo,
int32 ElementIndex
) const

   Types/AttributeStorage.h  

EAttributeStorageResult MultiSizeSetAttribute ( FAttributeAllocationInfo* AttributeAllocationInfo,
int32 TargetAllocationIndex,
const MultiSizeType& Value,
const uint8* SourceDataPtr,
bool& bOutNeedsDefrag
)

 Set a multisize(TArray, FString ...) attribute value into the storage at the allocation with TargetAllocationIndex. Types/AttributeStorage.h  

EAttributeStorageResult SetAttribute ( const FAttributeKey& ElementAttributeKey,
const T& Value
)

 Set an attribute value into the storage. Types/AttributeStorage.h  

EAttributeStorageResult SetAttribute ( FAttributeAllocationInfo* AttributeAllocationInfo,
const T& Value
)

   Types/AttributeStorage.h  

void UpdateAllocationCount()

   Types/AttributeStorage.h  

void UpdateAllocationInfoHash ( FAttributeAllocationInfo& AllocationInfo
)

   Types/AttributeStorage.h  

Static

Name Remarks Include Path Unreal Specifiers

static void CompareStorage ( const FAttributeStorage& BaseStorage,
const FAttributeStorage& VersionStorage,
TArray< FAttributeKey >& RemovedAttributes,
TArray< FAttributeKey >& AddedAttributes,
TArray< FAttributeKey >& ModifiedAttributes
)

 Compare two storage objects to know which properties were modified/added/removed. Types/AttributeStorage.h  

static void CopyStorageAttributes ( const FAttributeStorage& SourceStorage,
FAttributeStorage& DestinationStorage,
const TArray< TPair< FAttributeKey, FAttributeKey > >& SrcDestAttributeKeys
)

 Copy an array of attributes from the source storage to the destination storage. Types/AttributeStorage.h  

static void CopyStorageAttributes ( const FAttributeStorage& SourceStorage,
FAttributeStorage& DestinationStorage,
const TArray< FAttributeKey >& AttributeKeys
)

 Copy an array of attributes from the source storage to the destination storage. Types/AttributeStorage.h  

static uint64 GetValueSize ( const T& Value
)

   Types/AttributeStorage.h  

Operators

Name Remarks Include Path Unreal Specifiers

FAttributeStorage & operator= ( const FAttributeStorage& Other
)

   Types/AttributeStorage.h  

Ask questions and help your peers Developer Forums

Write your own tutorials or read those from others Learning Library

On this page