GNU Radio 3.6.1 C++ API
gr_nop.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2004,2010 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
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)
10  * any later version.
11  *
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.
16  *
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,
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21  */
22 
23 #ifndef INCLUDED_GR_NOP_H
24 #define INCLUDED_GR_NOP_H
25 
26 #include <gr_core_api.h>
27 #include <gr_block.h>
28 #include <stddef.h> // size_t
29 
30 class gr_nop;
32 
34 gr_make_nop (size_t sizeof_stream_item);
35 
36 /*!
37  * \brief Does nothing. Used for testing only.
38  * \ingroup misc_blk
39  */
40 class GR_CORE_API gr_nop : public gr_block
41 {
42  friend GR_CORE_API gr_nop_sptr gr_make_nop (size_t sizeof_stream_item);
43  gr_nop (size_t sizeof_stream_item);
44 
45 protected:
47 
48  // Method that just counts any received messages.
49  void count_received_msgs(pmt::pmt_t msg);
50 
51  public:
52  virtual int general_work (int noutput_items,
53  gr_vector_int &ninput_items,
54  gr_vector_const_void_star &input_items,
55  gr_vector_void_star &output_items);
56 
57  int nmsgs_received() const { return d_nmsgs_recvd; }
58 
59 };
60 
61 #endif /* INCLUDED_GR_NOP_H */