Example:

protected IASTFunctionDefinition createFunctionDefinition() {
        return new CPPASTFunctionDefinition();
    }

---

The createXXX methods are defined in the AbstractGNUSourceCodeParser and implemented in the GNUCPPSourceParser and GNUCSourceParser. The method returns a CPPXXX node in the CPP parser and a CXXX node in the C parser. OK, but only those from the abstract class need to be implemented like this. createFunctionDefinition() is only defined and used within GNUCPPSourceParser!