GNU Radio 3.5.1 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2004,2010 Free Software Foundation, Inc. 00004 * 00005 * This file is part of GNU Radio 00006 * 00007 * GNU Radio is free software; you can redistribute it and/or modify 00008 * it under the terms of the GNU General Public License as published by 00009 * the Free Software Foundation; either version 3, or (at your option) 00010 * any later version. 00011 * 00012 * GNU Radio is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 * GNU General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU General Public License 00018 * along with GNU Radio; see the file COPYING. If not, write to 00019 * the Free Software Foundation, Inc., 51 Franklin Street, 00020 * Boston, MA 02110-1301, USA. 00021 */ 00022 00023 #ifndef INCLUDED_GR_NULL_SOURCE_H 00024 #define INCLUDED_GR_NULL_SOURCE_H 00025 00026 #include <gr_core_api.h> 00027 #include <gr_sync_block.h> 00028 00029 class gr_null_source; 00030 typedef boost::shared_ptr<gr_null_source> gr_null_source_sptr; 00031 00032 GR_CORE_API gr_null_source_sptr 00033 gr_make_null_source (size_t sizeof_stream_item); 00034 00035 /*! 00036 * \brief A source of zeros. 00037 * \ingroup source_blk 00038 */ 00039 class GR_CORE_API gr_null_source : public gr_sync_block 00040 { 00041 friend GR_CORE_API gr_null_source_sptr gr_make_null_source (size_t sizeof_stream_item); 00042 00043 gr_null_source (size_t sizeof_stream_item); 00044 00045 public: 00046 virtual int work (int noutput_items, 00047 gr_vector_const_void_star &input_items, 00048 gr_vector_void_star &output_items); 00049 00050 }; 00051 00052 #endif /* INCLUDED_GR_NULL_SOURCE_H */