QValidator inheritance

The specialized validators QDoubleValidator, QIntValidator QRegExpValidator derived from the QValidator shall be defined as:

class QXXXValidator : public virtual QValidator

This would allow to extend the validator interface:

class MyValidatorInterface : public virtual QValidator
{
MyValidatorInterface( char *inp = 0 );
virtual someType myInterfaceMethod = 0; // e.g. QString getError();
};

class MyIntValidator : public MyValidatorInterface, public QIntValidator
{
QIntValidatorVerb( char *inp = 0 );
virtual int validate();
virtual someType myInterfaceMethod;
};

Currently such an attempt causes the ambiguity warning:

warning: virtual base 'QValidator' inaccessible in 'MyIntValidator' due to ambiguity