iterator_next_2d_block_d Subroutine

      SUBROUTINE iterator_next_2d_block_d (iterator, row, column, &
                                                       block, transposed, &
                                                       block_number, row_size, col_size, row_offset, col_offset)
     !! Gets the next data block, single/double precision real/complex

         TYPE(dbcsr_iterator), INTENT(INOUT)      :: iterator
        !! the iterator
         INTEGER, INTENT(OUT)                     :: row, column
        !! row of the data block
        !! column of the data block
         REAL(kind=real_8), DIMENSION(:, :), &
            POINTER                                :: block
        !! pointer to the data block
         LOGICAL, INTENT(OUT)                     :: transposed
        !! whether the block data is transposed
         INTEGER, INTENT(OUT), OPTIONAL           :: block_number
        !! block number
         INTEGER, INTENT(OUT), OPTIONAL           :: row_size, col_size, row_offset, col_offset
        !! logical row size of block
        !! logical column size of block

         CHARACTER(len=*), PARAMETER :: routineN = 'iterator_next_2d_block_d'

         INTEGER                                  :: blk_p, bp, csize, nze, rsize, &
                                                     block_row_size, block_col_size
         REAL(kind=real_8), DIMENSION(:), POINTER           :: lin_blk_p
         INTEGER                                  :: error_handle

!   ---------------------------------------------------------------------------
! If we're pointing to a valid block, return that block.

         IF (careful_mod) CALL timeset(routineN, error_handle)
         IF (iterator%pos .LE. iterator%nblks &
             .AND. iterator%pos .NE. 0) THEN
            row = iterator%row
            column = iterator%col_i(iterator%pos)
            IF (iterator%transpose) CALL swap(row, column)
            blk_p = iterator%blk_p(iterator%pos)
            transposed = blk_p .LT. 0
            bp = ABS(blk_p)
            rsize = iterator%row_size
            csize = iterator%cbs(column)
            block_row_size = rsize
            block_col_size = csize
            IF (PRESENT(row_size)) row_size = rsize
            IF (PRESENT(col_size)) col_size = csize
            IF (PRESENT(row_offset)) row_offset = iterator%row_offset
            IF (PRESENT(col_offset)) col_offset = iterator%coff(column)
            nze = rsize*csize
            IF (transposed) CALL swap(rsize, csize)
            CALL dbcsr_get_data(iterator%data_area, lin_blk_p, &
                                lb=bp, ub=bp + nze - 1)
            CALL pointer_rank_remap2(block, rsize, csize, lin_blk_p)
            IF (PRESENT(block_number)) block_number = iterator%pos
            ! Move to the next non-deleted position.
            CALL iterator_advance(iterator)
            CALL update_row_info(iterator)
         ELSE
            row = 0
            column = 0
            NULLIFY (block)
            IF (PRESENT(block_number)) block_number = 0
         END IF
         IF (careful_mod) CALL timestop(error_handle)
      END SUBROUTINE iterator_next_2d_block_d