Re #11422 Added virtual destructors to ScaleEngine

Code/Mantid/MantidPlot/src/plot2D/ScaleEngine.cpp

@@ -35,6 +35,8 @@ QwtScaleTransformation* ScaleEngine::transformation() const
 	return new ScaleTransformation(this);
 }
 
+ScaleTransformation::~ScaleTransformation() {}
+
 double ScaleTransformation::invXForm(double p, double p1, double p2, double s1, double s2) const
 {
 	if (!d_engine->hasBreak()){
@@ -217,6 +219,8 @@ d_break_decoration(true),
 d_nth_power(2.0)
 {}
 
+ScaleEngine::~ScaleEngine() {}
+
 bool ScaleEngine::hasBreak() const
 {
 return (d_break_left == d_break_right || (d_break_left == -DBL_MAX && d_break_right == DBL_MAX))?false:true;

Code/Mantid/MantidPlot/src/plot2D/ScaleEngine.h

@@ -44,6 +44,7 @@ public:
 	virtual double xForm(double x, double, double, double p1, double p2) const;
 	virtual double invXForm(double x, double s1, double s2, double p1, double p2) const;
 	QwtScaleTransformation* copy() const;
+  virtual ~ScaleTransformation();
 
 protected:
 	QwtScaleTransformation* newScaleTransformation() const;
@@ -56,6 +57,9 @@ class ScaleEngine: public QwtScaleEngine
 public:
 	ScaleEngine(ScaleTransformation::Type type = ScaleTransformation::Linear,
 				double left_break = -DBL_MAX, double right_break = DBL_MAX);
+
+  virtual ~ScaleEngine();
+
 	QwtScaleTransformation* transformation() const;
 	virtual QwtScaleDiv divideScale(double x1, double x2, int maxMajSteps,
 		int maxMinSteps, double stepSize = 0.0) const;