ACharacter::ClientAckGoodMove

function Engine Deprecated Since 4.0

Deprecated: Use ClientMoveResponsePacked instead.

#include "GameFramework/Character.h"

Access: public Specifiers: UFUNCTIONunreliableclient

Description

Sent by the server to the owning client to acknowledge that a specific move was accepted without correction. Allows the client to discard the corresponding saved move from its replay buffer.

Caveats & Gotchas

• Deprecated in favour of ClientMoveResponsePacked. The packed response path bundles acks and corrections into a single RPC, reducing the number of server-to-client messages.
• Because this is an unreliable RPC, the ack can be dropped. The client only discards saved moves when it receives an ack or correction; a dropped ack means the client retains extra moves in its buffer until the next correction arrives.
• Only the owning client receives this RPC — simulated proxies and the server itself do not.

Signature

ENGINE_API void ClientAckGoodMove(float TimeStamp)

Parameters

Name	Type	Description	Default
TimeStamp	float	Timestamp of the acknowledged move.	—

Return Type

void

Example

Override to clear custom predicted state on ack C++

void AMyCharacter::ClientAckGoodMove_Implementation(float TimeStamp)
{
    Super::ClientAckGoodMove_Implementation(TimeStamp);
    // Safe to discard any client-side predicted state associated with this timestamp
    MyPredictedState.AcknowledgeUpTo(TimeStamp);
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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