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/* -*- c++ -*- */
/*
* Copyright 2004,2009 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 3, 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., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_HEAD_H
#define INCLUDED_GR_HEAD_H
#include <gr_core_api.h>
#include <gr_sync_block.h>
#include <stddef.h> // size_t
class gr_head;
typedef boost::shared_ptr<gr_head> gr_head_sptr;
/*!
* \brief copies the first N items to the output then signals done
* \ingroup slicedice_blk
*
* Useful for building test cases
*/
class GR_CORE_API gr_head : public gr_sync_block
{
friend GR_CORE_API gr_head_sptr gr_make_head (size_t sizeof_stream_item, unsigned long long nitems);
gr_head (size_t sizeof_stream_item, unsigned long long nitems);
unsigned long long d_nitems;
unsigned long long d_ncopied_items;
public:
int work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
void reset() { d_ncopied_items = 0; }
void set_length(int nitems) { d_nitems = nitems; }
};
GR_CORE_API gr_head_sptr
gr_make_head (size_t sizeof_stream_item, unsigned long long nitems);
#endif /* INCLUDED_GR_HEAD_H */
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