- gr_buffer_sptr buf (gr_make_buffer (nitems, sizeof (int)));
- gr_buffer_reader_sptr r1 (gr_buffer_add_reader (buf, 0));
+ gr_buffer_sptr buf(gr_make_buffer (nitems, sizeof (int), gr_block_sptr()));
+ gr_buffer_reader_sptr r1 (gr_buffer_add_reader (buf, 0, gr_block_sptr()));