Function isValid

qcustomplot/qcustomplot.h:915–915

non-property methods:

  
  // non-property methods:
  bool isValid() const { return (mEnd >= mBegin) && (mBegin >= 0); }
  bool isEmpty() const { return length() == 0; }
  QCPDataRange bounded(const QCPDataRange &other) const;
  QCPDataRange expanded(const QCPDataRange &other) const;