GNU Radio 3.5.3.2 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2004,2009 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_HEAD_H 00024 #define INCLUDED_GR_HEAD_H 00025 00026 #include <gr_core_api.h> 00027 #include <gr_sync_block.h> 00028 #include <stddef.h> // size_t 00029 00030 class gr_head; 00031 typedef boost::shared_ptr<gr_head> gr_head_sptr; 00032 00033 /*! 00034 * \brief copies the first N items to the output then signals done 00035 * \ingroup slicedice_blk 00036 * 00037 * Useful for building test cases 00038 */ 00039 00040 class GR_CORE_API gr_head : public gr_sync_block 00041 { 00042 friend GR_CORE_API gr_head_sptr gr_make_head (size_t sizeof_stream_item, unsigned long long nitems); 00043 gr_head (size_t sizeof_stream_item, unsigned long long nitems); 00044 00045 unsigned long long d_nitems; 00046 unsigned long long d_ncopied_items; 00047 00048 public: 00049 int work (int noutput_items, 00050 gr_vector_const_void_star &input_items, 00051 gr_vector_void_star &output_items); 00052 00053 void reset() { d_ncopied_items = 0; } 00054 }; 00055 00056 GR_CORE_API gr_head_sptr 00057 gr_make_head (size_t sizeof_stream_item, unsigned long long nitems); 00058 00059 00060 #endif /* INCLUDED_GR_HEAD_H */