Fixes in ArrayView and VectorView

src/TNL/Containers/ArrayView.h

@@ -52,7 +52,7 @@ public:
    // "Templated copy-constructor" accepting any cv-qualification of Value
    template< typename Value_ >
    __cuda_callable__
-   ArrayView( ArrayView< Value_, Device, Index >& array )
+   ArrayView( const ArrayView< Value_, Device, Index >& array )
    : data(array.getData()), size(array.getSize()) {}
 
    // default move-constructor

src/TNL/Containers/VectorView.h

@@ -109,7 +109,7 @@ public:
 
    //! Computes scalar dot product
    template< typename Vector >
-   NonConstReal scalarProduct( const Vector& v );
+   NonConstReal scalarProduct( const Vector& v ) const;
 
    //! Computes this = thisMultiplicator * this + alpha * x.
    template< typename Vector >

src/TNL/Containers/VectorView_impl.h

@@ -243,7 +243,7 @@ template< typename Real,
    template< typename Vector >
 typename VectorView< Real, Device, Index >::NonConstReal
 VectorView< Real, Device, Index >::
-scalarProduct( const Vector& v )
+scalarProduct( const Vector& v ) const
 {
    return Algorithms::VectorOperations< Device >::template getScalarProduct< VectorView, Vector, NonConstReal >( *this, v );
 }