gr_head.h

来自「gnuradio软件无线电源程序.现在的手机多基于软件无线电」· C头文件 代码 · 共 55 行

/* -*- c++ -*- */
/*
 * Copyright 2004 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 2, 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifndef INCLUDED_GR_HEAD_H
#define INCLUDED_GR_HEAD_H

#include <gr_sync_block.h>
#include <stddef.h>			// size_t

/*!
 * \brief copies the first N items to the output then signals done
 * \ingroup block
 *
 * Useful for building test cases
 */

class gr_head : public gr_sync_block
{
  friend gr_block_sptr gr_make_head (size_t sizeof_stream_item, int nitems);
  gr_head (size_t sizeof_stream_item, int nitems);

  int	d_nitems;
  int	d_ncopied_items;

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

gr_block_sptr
gr_make_head (size_t sizeof_stream_item, int nitems);


#endif /* INCLUDED_GR_HEAD_H */