Added sparse matrix values holder.

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

                          ValuesHolder.h  -  description

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

    begin                : Jan 27, 2020

    copyright            : (C) 2020 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 Real,

          typename Device,

          typename Index,

          typename RealAllocator >

class ValuesHolder

: public Containers::Vector< Real, Device, Index, RealAllocator >

{};

template< typename Device,

          typename Index,

          typename RealAllocator >

class ValuesHolder< bool, Device, Index, RealAllocator >

{

   public:

      using RealType = bool;

      using DeviceType = Device;

      using IndexType = Index;

      ValuesHolder()

      : size( 0 ){};

      ValuesdHolder( const IndexType& size )

      : size( size ){};

      void setSize( const IndexType& size ) { this->size = size; };

      __cuda_callable__

      IndexType getSize() const { return this->size; };

      __cuda_callable__

      bool operator[]( const IndexType& i ) const { return true; };

   protected:

      IndexType size;

};

/**

 * \brief Serialization of arrays into binary files.

 */

template< typename Device, typename Index, typename Allocator >

File& operator<<( File& file, const ValuesHolder< bool, Device, Index, Allocator >& array ) { return file; };

template< typename Device, typename Index, typename Allocator >

File& operator<<( File&& file, const ValuesHolder< bool, Device, Index, Allocator >& array ) { return file; };

/**

 * \brief Deserialization of arrays from binary files.

 */

template< typename Device, typename Index, typename Allocator >

File& operator>>( File& file, ValuesHolder< bool, Device, Index, Allocator >& array ) { return file; };

template< typename Device, typename Index, typename Allocator >

File& operator>>( File&& file, ValuesHolder< bool, Device, Index, Allocator >& array ) { return file; };

      } //namespace details

   } //namepsace Matrices

} //namespace TNL

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