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It is basic C++: When you are using a pointer to a class, the class members are accessed by -> and not by ..
For better understanding, please read this and everything linked to that that you can find on Google
But in your case there is something wrong; it should be . instead of ->. Probably, as you mentioned, you have copied the code from more sources and in one place there was something like a pointer to the gray, but I do not understand why.
