GNU Radio 3.7.1 C++ API
head.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004,2009,2012,2013 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 <gnuradio/blocks/api.h>
00027 #include <gnuradio/sync_block.h>
00028 #include <stddef.h>                     // size_t
00029 
00030 namespace gr {
00031   namespace blocks {
00032 
00033     /*!
00034      * \brief copies the first N items to the output then signals done
00035      * \ingroup misc_blk
00036      *
00037      * \details
00038      * Useful for building test cases
00039      */
00040     class BLOCKS_API head : virtual public sync_block
00041     {
00042     public:
00043       // gr::blocks::head::sptr
00044       typedef boost::shared_ptr<head> sptr;
00045 
00046       static sptr make(size_t sizeof_stream_item,
00047                        uint64_t nitems);
00048 
00049       virtual void reset() = 0;
00050       virtual void set_length(int nitems) = 0;
00051     };
00052 
00053   } /* namespace blocks */
00054 } /* namespace gr */
00055 
00056 #endif /* INCLUDED_GR_HEAD_H */