STYLE: add data/cdata to VectorSpace for consistency with FixedList etc

applications/test/vector/Test-vector.C

@@ -87,6 +87,25 @@ void testIterator(const VecSpace& vs)
 }
 
 
+template<class VecSpace>
+void testData(const VecSpace& vs)
+{
+    Info<< "size: " << vs.size() << " for:";
+
+    const auto* data = vs.cdata();
+    for
+    (
+        const auto* endData = data + VecSpace::nComponents;
+        data != endData;
+        ++data
+    )
+    {
+        Info<< " " << *data;
+    }
+    Info<< nl;
+}
+
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 //  Main program:
 
@@ -105,6 +124,7 @@ int main(int argc, char *argv[])
 
         testIterator(vec1);
         testIterator(vec2);
+        testData(vec2);
 
         // Use STL algorithm(s)
 

src/OpenFOAM/primitives/VectorSpace/VectorSpace.H

@@ -178,6 +178,12 @@ public:
         inline void component(Cmpt&, const direction) const;
         inline void replace(const direction, const Cmpt&);
 
+        //- Return const pointer to the first data element
+        inline const Cmpt* cdata() const noexcept;
+
+        //- Return pointer to the first data element
+        inline Cmpt* data() noexcept;
+
         //- Return a VectorSpace with all elements = s
         inline static Form uniform(const Cmpt& s);
 
@@ -213,7 +219,7 @@ public:
         //- Return an iterator to begin of VectorSpace
         inline iterator begin();
 
-        //- Return an iterator to end of UListVectorSpace
+        //- Return an iterator to end of VectorSpace
         inline iterator end();
 
 

src/OpenFOAM/primitives/VectorSpace/VectorSpaceI.H

@@ -193,6 +193,20 @@ Foam::VectorSpace<Form, Cmpt, Ncmpts>::block() const
 
 // * * * * * * * * * * * * * * * * Iterator  * * * * * * * * * * * * * * * * //
 
+template<class Form, class Cmpt, Foam::direction Ncmpts>
+inline Cmpt* Foam::VectorSpace<Form, Cmpt, Ncmpts>::data() noexcept
+{
+    return v_;
+}
+
+
+template<class Form, class Cmpt, Foam::direction Ncmpts>
+inline const Cmpt* Foam::VectorSpace<Form, Cmpt, Ncmpts>::cdata() const noexcept
+{
+    return v_;
+}
+
+
 template<class Form, class Cmpt, Foam::direction Ncmpts>
 inline Cmpt* Foam::VectorSpace<Form, Cmpt, Ncmpts>::begin()
 {