// Quality.cpp

#include "Quality.h"

//**********************************************************************

// is quality valid?
// default is true--subclass sould override otherwise

bool Quality::is_valid() const {
  return true;
}

//**********************************************************************

// compare quality

bool Quality::is_better_than(const Quality& quality) const {

  // False if this quality is invalid.
  if ( ! is_valid() ) return false;

  // True if this is valid and the argument is not.
  if ( ! quality.is_valid() ) return true;

  // False if both are valid and the types are different.
  if ( get_type() != quality.get_type() ) return false;

  // If both are valid and of the same type, use user-supplied
  // comparison.
  return _is_better_than(quality);

}

//**********************************************************************