IConcertClientDataStore::CompareExchange

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Description

Exchanges the stored value to Desired if a stored value corresponding to Key exists, has the same type and its value is equal to Expected, otherwise, the operation fails.

template<typename T>  
TFuture < TConcertDataStoreResult < T > > CompareExchange  
(  
    const FName & Key,  
    const T & Expected,  
    const T & Desired  
)  
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template<typename T> TFuture < TConcertDataStoreResult < T > > CompareExchange (     const FName & Key,     const T & Expected,     const T & Desired )

Whether or not the key value was exchanged, as a future. The result code can be:

• EConcertDataStoreResultCode::Exchanged if the desired value was sucessfully exchanged and stored.
• EConcertDataStoreResultCode::Fetched if the stored value was not the expected one. The stored value was fetched instead.
• EConcertDataStoreResultCode::NotFound if the key could not be found.
• EConcertDataStoreResultCode::TypeMismatch if the stored data type did not match the expected/desired type.

Parameters

See Also

• TConcertDataStoreResult::GetValue()