CLANG \"implicit copy constructor\"

CLANG warning: definition of implicit copy assignment operator for 'CMeasurementUnit' is deprecated because it has a user-declared destructor

Solution:

//! Destructor
~CMeasurementUnit() = default;
+
+    //! Copy constructor
+    CMeasurementUnit(const CMeasurementUnit &) = default;
+
+    //! Copy assignment operator
+    CMeasurementUnit &operator =(const CMeasurementUnit &) = default;