made derived() private instead of protected in CRTP

src/blackmisc/pqphysicalquantity.h

@@ -23,13 +23,30 @@ namespace PhysicalQuantities
  */
 template <class MU, class PQ> class CPhysicalQuantity : public BlackMisc::CBaseStreamStringifier<PQ>
 {
-
 private:
     double m_unitValueD; //!< value backed by double
     qint32 m_unitValueI; //!< value backed by integer, allows sole integer arithmetic
     double m_convertedSiUnitValueD; //!< SI unit value
     bool m_isIntegerBaseValue; //!< flag integer? / double?
 
+    /*!
+     * \brief Easy access to derived class (CRTP template parameter)
+     * \return
+     */
+    PQ const* derived() const
+    {
+        return static_cast<PQ const *>(this);
+    }
+
+    /*!
+     * \brief Easy access to derived class (CRTP template parameter)
+     * \return
+     */
+    PQ* derived()
+    {
+        return static_cast<PQ *>(this);
+    }
+
 protected:
     MU m_unit; //!< unit
     MU m_conversionSiUnit; //!< corresponding SI base unit
@@ -59,24 +76,6 @@ protected:
         return this->unitValueRoundedWithUnit(-1);
     }
 
-    /*!
-     * \brief Easy access to derived class (CRTP template parameter)
-     * \return
-     */
-    PQ const* derived() const
-    {
-        return static_cast<PQ const *>(this);
-    }
-
-    /*!
-     * \brief Easy access to derived class (CRTP template parameter)
-     * \return
-     */
-    PQ* derived()
-    {
-        return static_cast<PQ *>(this);
-    }
-
     /*!
      * \brief Init by integer
      * \param baseValue