Unreal Engine C++ Notes

This was writting for Unreal Engine 4.23.0

Creating events

There are several types of events that can be created. Let’s look at some.

BlueprintImplementableEvent

As an event

// SomeActor.h
UFUNCTION(BlueprintImplementableEvent, meta=(DisplayName = "Some Display Name"))
void SomeFunction(const FString& arg1);

Call it with:

// SomeActor.cpp
void SomeOtherFunction() {
    SomeFunction("Test")
}

In the UE4 editor, create a subclass of SomeActor. In this new subclass’s blueprint, you can override the SomeFunction event.

As an function

// SomeActor.h
UFUNCTION(BlueprintImplementableEvent, meta=(DisplayName = "Some Display Name"))
void SomeFunction(FString& arg1);

Call it with:

// SomeActor.cpp
void SomeOtherFunction() {
    SomeFunction("Test")
}

In the UE4 editor, create a subclass of SomeActor. In this new subclass’s blueprint, you can override the SomeFunction function.

Written by Peter Chau, a Canadian Software Engineer building AIs, APIs, UIs, and robots.