Missing * in non pointer arguments for UFUNCTION

Development Programming & Scripting
1

I’m trying to make a BlueprintCallable function in c++ with an actor component and a UENUM as arguments.

.h

UFUNCTION(BlueprintCallable)
	/**
	* This function is to be used at runtime to send the most recent frame data to the neural network.
	* @param neuralNetwork - Reference to the neural network to send the data to
	* @param netUsage - If it is being used to test or train the network
	*/
	void SendDataToNetwork(UNeuralNetwork &neuralNetwork, NetworkUse netUsage);

.cpp

void ULeapDataCollector::SendDataToNetwork(UNeuralNetwork &neuralNetwork, NetworkUse netUsage)
{
	// Switches the use of the function based on what is needed from it
	switch (netUsage) {

	case NetworkUse::Train:
		// Network is being trained by this data
		neuralNetwork.TrainIndex(this->trainingData.Last().data, this->trainingData.Last().gestureIndex);
		break;

	case NetworkUse::Runtime:
		// Network is being tested by this data or being used at runtime
		neuralNetwork.FeedForward(this->trainingData.Last().data);
		break;
	}
}

It keeps giving me this error message: Missing '*' in Expected a pointer type

No idea what is going wrong so any help would be useful

2

Remove “this->”. The function is inside the class and the code is in the scope of the function. Therefore using “this->” is not needed. For example, replace “this->trainingData.Last()” to “trainingData.Last()”. I hope this makes sense!

3

I just did that and it’s still giving that error

Edit: It’s giving me the error line being the declaration in the header file

4

Can you give me the full error?

5

Just tried completely deleting the definition in the cpp file and it still gave me that error

6

I’ve just realized the problem now. Change “UNeuralNetwork& neuralNetwork” to “UNeuralNetwork* neuralNetwork”. When you’re referencing UObjects use pointers instead of references as the objects can be deleted and references can’t be null.

7

Okay, that seems to have worked. I wasn’t sure if pointers would be exposed in Blueprint as they don’t really have them but they do have references which is why I went that route