onoverlapbegin ue4 c++

// Assuming you have a class or actor that inherits from AActor

// Declare a function signature for the OnOverlapBegin event
UFUNCTION()
void OnOverlapBegin(UPrimitiveComponent* OverlappedComp, 
                    AActor* OtherActor, 
                    UPrimitiveComponent* OtherComp, 
                    int32 OtherBodyIndex, 
                    bool bFromSweep, 
                    const FHitResult& SweepResult);

// In the constructor or BeginPlay function, bind the OnOverlapBegin function to the overlap event
// For example, in the constructor:
AYourActorClass::AYourActorClass()
{
    // Set this actor to call Tick() every frame
    PrimaryActorTick.bCanEverTick = true;

    // Set up the collision component (assuming you have one)
    UBoxComponent* BoxComponent = CreateDefaultSubobject<UBoxComponent>(TEXT("BoxComponent"));
    RootComponent = BoxComponent;

    // Bind the OnOverlapBegin function to the OnComponentBeginOverlap event
    BoxComponent->OnComponentBeginOverlap.AddDynamic(this, &AYourActorClass::OnOverlapBegin);
}

// Implement the OnOverlapBegin function
void AYourActorClass::OnOverlapBegin(UPrimitiveComponent* OverlappedComp, 
                                     AActor* OtherActor, 
                                     UPrimitiveComponent* OtherComp, 
                                     int32 OtherBodyIndex, 
                                     bool bFromSweep, 
                                     const FHitResult& SweepResult)
{
    // Your code for what happens when the overlap begins
    // This function will be called whenever there is an overlap with the actor's collision component
}