Why can't I call base public method?

[lni]

This is weird. Any idea on this error?

The compiler (g++) complains

main.cpp: In function `int main()':
main.cpp:42: error: no matching function for call to `ClassB::zValue(QPointF, bool*)'
main.cpp:32: note: candidates are: virtual double ClassB::zValue(double, double, bool*) const
gmake: *** [main.o] Error 1

#include <QPointF>
 
class ClassA
{
public:
 
  ClassA() {}
  virtual ~ClassA() {}
 
  virtual double zValue( double xpos, double ypos, bool* ok=0 ) const=0;
  double zValue( const QPointF& xy, bool* ok=0 ) const;
 
};
 
double ClassA::zValue( const QPointF& xy, bool* ok ) const
{
  return zValue( xy.x(), xy.y(), ok );
}
 
class ClassB : public ClassA
{
public:
 
  ClassB() {}
  ~ClassB() {}
 
  virtual double zValue( double xpos, double ypos, bool* ok=0 ) const;
 
};
 
double ClassB::zValue( double xpos, double ypos, bool* ok ) const
{
  if ( ok ) *ok = true;
  return xpos + ypos;
}
 
int main()
{
  ClassB mess;
 
  bool ok;
  mess.zValue( QPointF( 0, 0 ), &ok );
 
}

#include <QPointF>

class ClassA
{
public:

  ClassA() {}
  virtual ~ClassA() {}

  virtual double zValue( double xpos, double ypos, bool* ok=0 ) const=0;
  double zValue( const QPointF& xy, bool* ok=0 ) const;

};

double ClassA::zValue( const QPointF& xy, bool* ok ) const
{
  return zValue( xy.x(), xy.y(), ok );
}

class ClassB : public ClassA
{
public:

  ClassB() {}
  ~ClassB() {}

  virtual double zValue( double xpos, double ypos, bool* ok=0 ) const;

};

double ClassB::zValue( double xpos, double ypos, bool* ok ) const
{
  if ( ok ) *ok = true;
  return xpos + ypos;
}

int main()
{
  ClassB mess;

  bool ok;
  mess.zValue( QPointF( 0, 0 ), &ok );

}

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[caduel]

the declaration is hidden by the subclass.
add the line

using ClassA::zValue;

using ClassA::zValue;

To copy to clipboard, switch view to plain text mode 

to the subclass ClassB

HTH

[lni]

the declaration is hidden by the subclass.
add the line

using ClassA::zValue;

using ClassA::zValue;

To copy to clipboard, switch view to plain text mode 

to the subclass ClassB

HTH

Thanks! First time seeing this!

[Sheng]

the declaration is hidden by the subclass.
add the line

using ClassA::zValue;

using ClassA::zValue;

To copy to clipboard, switch view to plain text mode 

to the subclass ClassB

HTH

Thanks! First time seeing this!

better just use mess.ClassA::zValue(QPointF(0,0),&ok);