[c++] invalid use of non-static member function

You shall pass a this pointer to tell the function which object to work on because it relies on that as opposed to a static member function.

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invalid use of non-static member function Difference between Static methods and Instance methods C# error: "An object reference is required for the non-static field, method, or property" Non-static variable cannot be referenced from a static context Calling Non-Static Method In Static Method In Java