Added SparseMatrixRowViewValueGetter.

/***************************************************************************

                          SparseMatrixRowViewValueGetter.h  -  description

                             -------------------

    begin                : May 4, 2021

    copyright            : (C) 2021 by Tomas Oberhuber

    email                : tomas.oberhuber@fjfi.cvut.cz

 ***************************************************************************/

/* See Copyright Notice in tnl/Copyright */

#pragma once

namespace TNL {

   namespace Matrices {

      namespace details {

template< typename SegmentView,

          typename ValuesView,

          typename ColumnsIndexesView,

          bool isBinary_ >

struct SparseMatrixRowViewValueGetter {};

template< typename SegmentView,

          typename ValuesView,

          typename ColumnsIndexesView >

struct SparseMatrixRowViewValueGetter< SegmentView, ValuesView, ColumnsIndexesView, true >

{

   using RealType = typename ValuesView::RealType;

   using IndexType = typename ColumnsIndexesView::IndexType;

   using ResultType = bool;

   using ConstResultType = bool;

   __cuda_callable__

   static bool getValue( const IndexType& globalIdx, const ValuesView& values, const ColumnsIndexesView& columnIndexes, const IndexType& paddingIndex )

   {

      if( columnIndexes[ globalIdx ] != paddingIndex )

         return true;

      return false;

   };

};

template< typename SegmentView,

          typename ValuesView,

          typename ColumnsIndexesView >

struct SparseMatrixRowViewValueGetter< SegmentView, ValuesView, ColumnsIndexesView, false >

{

   using RealType = typename ValuesView::RealType;

   using IndexType = typename ColumnsIndexesView::IndexType;

   using ResultType = RealType&;

   using ConstResultType = const RealType&;

   __cuda_callable__

   static const RealType& getValue( const IndexType& globalIdx, const ValuesView& values, const ColumnsIndexesView& columnIndexes, const IndexType& paddingIndex )

   {

      return values[ globalIdx ];

   };

   __cuda_callable__

   static RealType& getValue( const IndexType& globalIdx, ValuesView& values, ColumnsIndexesView& columnIndexes, const IndexType& paddingIndex )

   {

      return values[ globalIdx ];

   };

};

      } //namespace details

   } //namepsace Matrices

} //namespace TNL