Refactoring segments printing.

   return str;

}

/**

 * \brief Print segments with related content.

 *

 * \tparam Segments is type of segments.

 * \tparam Fetch is a lambda function for reading related data.

 * \param segments is an instance of segments.

 * \param fetch is an instance of lambda function reading related data. It is supposed to defined as

 *

 * ```

 * auto fetch = [=] __cuda_callable__ ( IndexType globalIdx ) -> ValueType { return data_view[ globalIdx ]; };

 * ```

 *

 * \param str is output stream.

 * \return reference to the output stream.

 *

 * \par Example

 * \include Algorithms/Segments/SegmentsPrintingExample-2.cpp

 * \par Output

 * \include SegmentsPrintingExample-2.out

 */

template< typename Segments,

          typename Fetch >

std::ostream& printSegments( const Segments& segments, Fetch&& fetch, std::ostream& str )

struct SegmentsPrinter

{

   SegmentsPrinter( const Segments& segments, Fetch& fetch )

   : segments( segments ), fetch( fetch ) {}

   std::ostream& print( std::ostream& str ) const

   {

      using IndexType = typename Segments::IndexType;

      using DeviceType = typename Segments::DeviceType;

      return str;

   }

template< typename Segments,

          typename Fetch >

struct SegmentsPrinter

{

   SegmentsPrinter( const Segments& segments, Fetch& fetch )

   : segments( segments ), fetch( fetch ) {}

   std::ostream& print( std::ostream& str ) const { return printSegments( segments, fetch, str ); }

   protected:

   const Segments& segments;