Blueprint node with multiple execution outputs.md

2021-01-13_15:02:40

Blueprint node with multiple execution outputs

A Blueprint node can have multiple execution outputs. Branch and Switch are examples of such nodes. We can give multiple output execution pins on nodes for our own C++ functions as follows:

Header:

UENUM(BlueprintType)
enum class EMyExecutionPins : uint8
{
    Success,
    Failure
}

UCLASS(BlueprintType)
class AMyActor : public AActor
{
    GeneratedBody()

    UFUNCTION(BlueprintCallable, Meta = (ExpandEnumAsExecs = "Result"))
    void MyFunction(TEnumAsByte<EMyExecutionPins>& Result);
}

Implementation:

void AMyActor::MyFunction(TEnumAsByte<EMyExecutionPins>& Result)
{
    bool success = /* Do your work here. */;
    Result = success ? EMyExecutionPins::Success : EMyExecutionPins::Failure;
}

The EnumAsByte part may be unnecessary, just EMyExecutionPins& might work just as well.