Crossplay Events in C++

Bind dynamic delegates from a UObject; handler functions must be UFUNCTION() methods with matching signatures.

#include "Lobbies/UCIKLobbySubsystem.h"

void UMyPartyManager::InitializeEvents()
{
	UUCIKLobbySubsystem* Events =
		GetGameInstance()->GetSubsystem<UUCIKLobbySubsystem>();
	Events->OnMemberJoined.AddDynamic(this, &UMyPartyManager::HandleMemberJoined);
	Events->OnJoinRequested.AddDynamic(this, &UMyPartyManager::HandleJoinRequested);
}

UFUNCTION()
void UMyPartyManager::HandleMemberJoined(
	const FUCIK_LobbyHandle& Lobby,
	const FUCIK_PlayerHandle& Member);

UFUNCTION()
void UMyPartyManager::HandleJoinRequested(const FUCIK_Lobby& Lobby);

Also bind OnMemberLeft (FUCIK_MemberLeftEvent: reason and whether the member owned the lobby), OnOwnerChanged (FUCIK_OwnerChangedEvent: new and previous owner), OnLobbyUpdated, OnInviteReceived, OnInviteAccepted, OnLobbyMessage, and OnJoinRequestRejected as needed. Each event also has a fully typed native delegate. Session providers with the Events capability surface the same shape through UUCIK_SessionEventsSubsystem.

See Blueprint usage.

Use the unified subsystem first. Use a kit-specific notification only for that platform's exact option set.