How to I fix undefined reference in C++

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C++

I have read about the error on the internet, and it said it could be a name mismatch. But it's not i have checked, all the names are the same in the .h and .cpp file. So basically this is how it looks in the header(.h):

template <class T> class GameArray {
private:
  T* array;
public:
  GameArray(); //The constructor
};

And the source (.cpp):

template <class T>
GameArray<T>::GameArray() {}

What I have tried:

I have tried different types of making class work, and this is according to the internet the way to go about it.