IConcertClientDataStore::FetchOrAdd

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Description

Searches the store for the specified key, if not found, adds a new key/value pair, otherwise, if the stored value type matches the initial value type, fetches the stored value. The function accepts a USTRUCT() type or a supported basic type directly. To store complex types such as TArray<> TMap<> or TSet<>, wrap the type(s) in a USTRUCT().

template<typename T>  
TFuture < TConcertDataStoreResult < T > > FetchOrAdd  
(  
    const FName & Key,  
    const T & InitialValue  
)  
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template<typename T> TFuture < TConcertDataStoreResult < T > > FetchOrAdd (     const FName & Key,     const T & InitialValue )

Whether or not the key/value pair was added, fetched or the operation failed. The result code can be:

• EConcertDataStoreResultCode::Added if the key/value was inserted.
• EConcertDataStoreResultCode::Fetched if the key was already taken and type matched.
• EConcertDataStoreResultCode::TypeMismatch if the key was already taken but the value types did not match.

Parameters

See Also

• TConcertDataStoreResult::GetValue()