Merge pull request InsightSoftwareConsortium#5717 from N-Dekker/Index-Offset-Size-front-back-return-m_InternalArray

STYLE: Let Index, Offset, Size front and back return m_InternalArray[i]

Author: thewtex

Modules/Core/Common/include/itkIndex.h

@@ -456,25 +456,25 @@ struct ITK_TEMPLATE_EXPORT Index final
   [[nodiscard]] constexpr reference
   front()
   {
-    return *begin();
+    return m_InternalArray[0];
   }
 
   [[nodiscard]] constexpr const_reference
   front() const
   {
-    return *begin();
+    return m_InternalArray[0];
   }
 
   [[nodiscard]] constexpr reference
   back()
   {
-    return VDimension ? *(end() - 1) : *end();
+    return m_InternalArray[VDimension - 1];
   }
 
   [[nodiscard]] constexpr const_reference
   back() const
   {
-    return VDimension ? *(end() - 1) : *end();
+    return m_InternalArray[VDimension - 1];
   }
 
   [[nodiscard]] IndexValueType *

Modules/Core/Common/include/itkOffset.h

@@ -405,25 +405,25 @@ struct ITK_TEMPLATE_EXPORT Offset final
   [[nodiscard]] constexpr reference
   front()
   {
-    return *begin();
+    return m_InternalArray[0];
   }
 
   [[nodiscard]] constexpr const_reference
   front() const
   {
-    return *begin();
+    return m_InternalArray[0];
   }
 
   [[nodiscard]] constexpr reference
   back()
   {
-    return VDimension ? *(end() - 1) : *end();
+    return m_InternalArray[VDimension - 1];
   }
 
   [[nodiscard]] constexpr const_reference
   back() const
   {
-    return VDimension ? *(end() - 1) : *end();
+    return m_InternalArray[VDimension - 1];
   }
 
   [[nodiscard]] OffsetValueType *

Modules/Core/Common/include/itkSize.h

@@ -380,25 +380,25 @@ struct ITK_TEMPLATE_EXPORT Size final
   [[nodiscard]] constexpr reference
   front()
   {
-    return *begin();
+    return m_InternalArray[0];
   }
 
   [[nodiscard]] constexpr const_reference
   front() const
   {
-    return *begin();
+    return m_InternalArray[0];
   }
 
   [[nodiscard]] constexpr reference
   back()
   {
-    return VDimension ? *(end() - 1) : *end();
+    return m_InternalArray[VDimension - 1];
   }
 
   [[nodiscard]] constexpr const_reference
   back() const
   {
-    return VDimension ? *(end() - 1) : *end();
+    return m_InternalArray[VDimension - 1];
   }
 
   [[nodiscard]] SizeValueType *