You should never declare a class in its own source file.

Name: You should never declare a class in its own source file.
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Quizplus · Accepted Answer

It is possible and common to declare a class in its own source file. This is known as a header file and is used to provide a class's interface to other parts of a program. However, it is generally good practice to define the implementation of the class in a separate source file.

You Should Never Declare a Class in Its Own Source