gr_null_source.h

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/* -*- c++ -*- */
/*
 * Copyright 2004,2010 Free Software Foundation, Inc.
 * 
 * This file is part of GNU Radio
 * 
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 * 
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_GR_NULL_SOURCE_H
#define INCLUDED_GR_NULL_SOURCE_H

#include <gr_core_api.h>
#include <gr_sync_block.h>

class gr_null_source;
typedef boost::shared_ptr<gr_null_source> gr_null_source_sptr;

GR_CORE_API gr_null_source_sptr
gr_make_null_source (size_t sizeof_stream_item);

/*!
 * \brief A source of zeros.
 * \ingroup source_blk
 */
class GR_CORE_API gr_null_source : public gr_sync_block
{
  friend GR_CORE_API gr_null_source_sptr gr_make_null_source (size_t sizeof_stream_item);

  gr_null_source (size_t sizeof_stream_item);

 public:
  virtual int work (int noutput_items,
                    gr_vector_const_void_star &input_items,
                    gr_vector_void_star &output_items);
  
};

#endif /* INCLUDED_GR_NULL_SOURCE_H */