From 505bab9a6c43ef7fd3c815fa92bb90a05a9f2fac Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Sun, 30 Sep 2012 13:34:26 -0400
Subject: howto: updated howto-write-a-block to use new impl style.
---
gr-howto-write-a-block/lib/square2_ff_impl.cc | 98 +++++++++++++++++++++++++++
1 file changed, 98 insertions(+)
create mode 100644 gr-howto-write-a-block/lib/square2_ff_impl.cc
(limited to 'gr-howto-write-a-block/lib/square2_ff_impl.cc')
diff --git a/gr-howto-write-a-block/lib/square2_ff_impl.cc b/gr-howto-write-a-block/lib/square2_ff_impl.cc
new file mode 100644
index 0000000000..f508a6e05b
--- /dev/null
+++ b/gr-howto-write-a-block/lib/square2_ff_impl.cc
@@ -0,0 +1,98 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2010,2012 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.
+ */
+
+/*
+ * config.h is generated by configure. It contains the results
+ * of probing for features, options etc. It should be the first
+ * file included in your .cc file.
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "square2_ff_impl.h"
+#include <gr_io_signature.h>
+
+namespace gr {
+ namespace howto {
+
+ /*
+ * Create a new instance of howto_square2_ff and return a boost
+ * shared_ptr. This is effectively the public constructor.
+ */
+ square2_ff::sptr
+ square2_ff::make()
+ {
+ return gnuradio::get_initial_sptr
+ (new square2_ff_impl());
+ }
+
+ /*
+ * Specify constraints on number of input and output streams.
+ * This info is used to construct the input and output signatures
+ * (2nd & 3rd args to gr_block's constructor). The input and
+ * output signatures are used by the runtime system to check that
+ * a valid number and type of inputs and outputs are connected to
+ * this block. In this case, we accept only 1 input and 1 output.
+ */
+ static const int MIN_IN = 1; // mininum number of input streams
+ static const int MAX_IN = 1; // maximum number of input streams
+ static const int MIN_OUT = 1; // minimum number of output streams
+ static const int MAX_OUT = 1; // maximum number of output streams
+
+ /*
+ * The private constructor
+ */
+ square2_ff_impl::square2_ff_impl()
+ : gr_sync_block("square2_ff",
+ gr_make_io_signature(MIN_IN, MAX_IN, sizeof(float)),
+ gr_make_io_signature(MIN_OUT, MAX_OUT, sizeof(float)))
+ {
+ // nothing else required in this example
+ }
+
+ /*
+ * Our virtual destructor.
+ */
+ square2_ff_impl::~square2_ff_impl()
+ {
+ // nothing else required in this example
+ }
+
+ int
+ square2_ff_impl::work(int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ const float *in = (const float*)input_items[0];
+ float *out = (float*)output_items[0];
+
+ for(int i = 0; i < noutput_items; i++) {
+ out[i] = in[i] * in[i];
+ }
+
+ // Tell runtime system how many output items we produced.
+ return noutput_items;
+ }
+
+ } /* namespace howto */
+} /* namespace gr */
--
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