Qt Centre Forum FAQ

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How to get rid of "error: invalid use of incomplete type ‘X’" error?

This error means you were trying to use a class or structure that has not been defined. You either misspelled a type name or didn't include the proper header file for the class.

To solve the problem add the following statment near the beginning of the file: 

#include <X>
where X is the name of the class or structure the compiler complains about.

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