Blueprint functions without exec pins in Unreal Engine

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Blueprint functions without exec pins

There are 2 types of blueprint functions.


Functions with no side-effects

These are colored green in the node editor and do not have exec pins. This means they can always be called and do not change anything internally.

Such a function can be written in c++ as

UFUNCTION(BlueprintPure)
FString MyFunction(int32 MyParameter1);

Note that these functions must have a return type. The keyword “BlueprintPure” tells that no exec pins are needed.


Functions with side-effects

These are colored blue in the node editor and have exec pins. Means, they need to be put in a sequential workflow to work

Such a function can be written in c++ as

UFUNCTION(BlueprintCallable)
void MyFunction(int32 MyParameter1);

The keyword “BlueprintCallable” tells that exec pins are needed. However, if this does not work, one can also write “BlueprintPure = false” to override the behavior.


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