Property Specifier BlueprintGetter and BlueprintSetter Seems Useless

[wz4ever (Wang Zhi)]

The source code is at the bottom.

If I don’t use the property specifier BlueprintGetter and BlueprintSetter for the private variable Health , I can also use Getter and Setter function to access it in Blueprint, like this:

But if I delete the comment and use the specifier, I can access the private variable Health directly in Blueprint.Doing so destroys encapsulation, which is the opposite of the purpose of Getter and Setter functions.

So what’s the meaning of BlueprintGetter and BlueprintSetter ?

private:
    // UPROPERTY(BlueprintGetter=GetHealth, BlueprintSetter=SetHealth) ?????
    int32 Health;
public:
    UFUNCTION(BlueprintPure)
    int32 GetHealth() const { return Health; }
    UFUNCTION(BlueprintCallable)
    void SetHealth(int32 InHealth) { this->Health = InHealth; }

[wz4ever (Wang Zhi)]

There is a old post about this topic, but I think their answer didn’t solve my problem, which is that the property specifier BlueprintGetter and BlueprintSetter aren’t actually needed at all.

What's the point of BlueprintGetter if it didn't hide the direct access to that variable in BP?

define in code: UPROPERTY(BlueprintGetter = Getter) int var; UFUNCTION(BlueprintCallable) int Getter() const; But I can still get the value of var by a direct reference to it in BP. Because it is implicitly BlueprintReadOnly. BlueprintGetter=GetterFunctionName This property specifies a custom accessor function. If this property isn’t also tagged with BlueprintSetter or BlueprintReadWrite, then it is implicitly BlueprintReadOnly. Similarly with BlueprintSetter. So I don’t understand the…

[wz4ever (Wang Zhi)]

I already know the answer. What these two property specifier do is like specifier ReplicatedUsing. They make marked function as a callback function. No matter what approach the BP side access the property,those access function will always be called.

public:
	UFUNCTION(BlueprintPure)
    int32 GetHealth() const
	{
		UE_LOG(LogTemp, Warning, TEXT("GetHealth: %d"), Health);
		return Health;
	}
    UFUNCTION(BlueprintCallable)
	void SetHealth(int32 InHealth)
	{
		UE_LOG(LogTemp, Warning, TEXT("SetHealth: %d"), InHealth);
		Health = InHealth;
	}
private:
	UPROPERTY(BlueprintGetter=GetHealth, BlueprintSetter=SetHealth)
    int32 Health{100};

We can get log info like this:

LogTemp: Warning: SetHealth: 50
LogTemp: Warning: GetHealth: 50