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2020-10-14_18:31:53

UBlueprintFunctionLibrary

Free functions and UStruct "member" function are exported to Blueprints using a Blueprint Function Library. The library is a class inheriting from UBlueprintFunctionLibrary that contains a bunch of static UFunctions. The functions must be Blueprint Callable and have a Category.

#include "Kismet/BlueprintFunctionLibrary.h"

UCLASS()
class MYMODULE_API UMyFunctionLibrary : public UBlueprintFunctionLibrary
{
    GENERATED_BODY()

    UFUNCTION(BlueprintCallable, Category = "My Category")
    static void MyFunction();
};

The parameters taken by each function must be Blueprint compatible, i.e., one of the supported primitive types (not double) or a UClass or UStruct with the BlueprintType Specifier.

Parameters can be passed by reference from a Blueprint Visual Script by decorating a reference parameter with UPARAM(ref).

UFUNCTION(BlueprintCallable)
static void Blah(UPARAM(ref) FMyStruct& MyStruct);

[[2020-03-09_21:48:56]] UFUNCTION
[[2020-03-10_21:12:12]] USTRUCT
[[2020-03-09_21:34:05]] UCLASS