3 * Copyright 2004 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
23 #ifndef INCLUDED_GR_NULL_SOURCE_H
24 #define INCLUDED_GR_NULL_SOURCE_H
26 #include <gr_sync_block.h>
29 * \brief A source of zeros.
33 class gr_null_source : public gr_sync_block
35 friend gr_block_sptr gr_make_null_source (size_t sizeof_stream_item);
37 gr_null_source (size_t sizeof_stream_item);
40 virtual int work (int noutput_items,
41 gr_vector_const_void_star &input_items,
42 gr_vector_void_star &output_items);
47 gr_make_null_source (size_t sizeof_stream_item);
49 #endif /* INCLUDED_GR_NULL_SOURCE_H */