Does UE4 optimize TArray Properties Replication already?

Development Programming & Scripting C++
1

Does UE4 optimize TArray Properties Replication already?
I uses TArray to store the list of player items. If player got many items, will add or remove items in the TArray cause the whole TArray elements copy to Client?

I can not find out the really working flows of TArray Properties Replications.
I hope some guys could help me figue out it or explain it.

Sorry for my poor English. You don’t understand, please point it out.

2

I’m worried about the performance of TArray Properties Replications.

If it has performance problems, I think I should implement add, remove in RPC.

4

If it works like you said.
How can I know which element of TArray is add, remove, or changed?

The only way I got in my head is that in OnRep_ function, compare the old TArray with the new just replicated TArray.
Am I wrong?

6

There is a way to get the old value of a replicated variable. Just pass an argument of the same type to the OnRep_Function() like this


/** declaration of a replciated actor array*/
UPROPERTY(Transient, BlueprintReadOnly, ReplicatedUsing = OnRep_Array)
TArray<class AActor*> ReplicatedActors;



void AYourActor::OnRep_Array(TArray<class AActor*> PreReplicationArray)
{
	//ReplicatedActors has already been replicated as this point.
        //PreReplicationArray has the values pre-replication.
}
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