Error with TArray floats in Unreal Engine C++

Question

C++ and Unreal newbie here. I have a class with a function I'm calling from a Blueprint. I want to create an array of floats (converted from a string) and push a value from Blueprint to it, but I'm getting an error I don't quite understand.

I'm declaring the array like this in my header file:

private:
    TArray<float> SensorValues[5];

Then I try to push a value from my Blueprint in the cpp file:

void Test::UpdateSensor(FString SensorValue)
{
    float sensorVal = FCString::Atof(*SensorValue);
    SensorValues.Push(sensorVal);
}

Which results in this error:

   error C2228: left of '.Push' must have class/struct/union

Any guidance?

`TArray SensorValues[5];` declares a raw array of 5 `TArray` instances. Raw arrays do not provide any member functions, hence the error message. — πάντα ῥεῖ, Sep 03 '18 at 23:32
So what should it look like? Originally I had this as the declaration in the header, but it gives the same compiler error: TArray SensorValues; Does that still result in a raw array? If so, why? — Andrew Langley, Sep 04 '18 at 00:05
But if I do that, it still results in the same compiler error when I try to push to it. error C2228: left of '.Push' must have class/struct/union — Andrew Langley, Sep 04 '18 at 00:19
The code appears confused on the type of SensorValues. Does the TArray type have a method called Push? If so you need to pick a specific element in the SensorValues array like SensorValues[1].Push(sensorVal); — Matthew Fisher, Sep 04 '18 at 00:31
Trying to index it like you suggested gives more errors, since it's not a valid element. TArray does have a Push method as far as I can tell. — Andrew Langley, Sep 04 '18 at 00:47

score 0 · Answer 1 · answered Sep 12 '18 at 10:16

0

I think you forgot to include the header :D

answered Sep 12 '18 at 10:16

buRn

66
3

score 0 · Answer 2 · answered Sep 12 '18 at 10:21

0

According to documentation TArray is dynamic array, so you should have tried

private: TArray<float> SensorValues;

besides

private: TArray<float> SensorValues[5];

answered Sep 12 '18 at 10:21

Hayra

456
2
7
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Error with TArray floats in Unreal Engine C++

2 Answers2