Read property on GameModeBase from GameStateBase

Development Programming & Scripting C++
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I’m new in Unreal development. I have a question: I have created an object on my GameModeBase class. It is legal access this object from GameStateBase class? I don’t know if there is a good practices manual.

I’m developing Pong game with C++ only and I have created the ball in GameModeBase. I need to access it from GameStateBase to start move it when user press Spacebar.

But… I don’t know how to get access to GameModeBase from GameStateBase.

I get an instance of GameModeBase this way:

UWorld* const world = GetWorld();
if (world)
{
	ABall* ball = (Cast<AMyPongGameModeBase>(world->GetAuthGameMode()))->CurrentBall;
	ball->StartMovement();
}

Maybe I’m think about how to do it instead of doing it.