Re #22048: Applied fixes to Framework/HistogramData.

Framework/HistogramData/inc/MantidHistogramData/FixedLengthVector.h

@@ -169,8 +169,8 @@ public:
   const double &back() const { return m_data.back(); }
 
   // expose typedefs for the iterator types in the underlying container
-  typedef std::vector<double>::iterator iterator;
-  typedef std::vector<double>::const_iterator const_iterator;
+  using iterator = std::vector<double>::iterator;
+  using const_iterator = std::vector<double>::const_iterator;
 };
 
 } // namespace detail

Framework/HistogramData/inc/MantidHistogramData/Iterable.h

@@ -86,8 +86,8 @@ public:
   }
 
   // expose typedefs for the iterator types in the underlying container
-  typedef std::vector<double>::iterator iterator;
-  typedef std::vector<double>::const_iterator const_iterator;
+  using iterator = std::vector<double>::iterator;
+  using const_iterator = std::vector<double>::const_iterator;
 
 protected:
   ~Iterable() = default;