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/*
* Copyright 2011 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.
*/
#include <gr_transcendental.h>
#include <gr_io_signature.h>
#include <stdexcept>
#include <complex> //complex math
#include <cmath> //real math
#include <map>
/***********************************************************************
* work function creation and registration
**********************************************************************/
typedef int(*work_fcn_type)(int, gr_vector_const_void_star &, gr_vector_void_star &);
struct map_val_type{
work_fcn_type work_fcn;
size_t io_size;
};
typedef std::map<std::string, map_val_type> map_type;
//construct map on first use idiom
static map_type &get_map(void){
static map_type map;
return map;
}
//static initialization of this object registers a function
struct gr_transcendental_registrant{
gr_transcendental_registrant(
const std::string &key,
const work_fcn_type &work_fcn,
const size_t io_size
){
map_val_type val;
val.work_fcn = work_fcn;
val.io_size = io_size;
get_map()[key] = val;
}
};
//macro to create a work function and register it
#define REGISTER_FUNCTION(__fcn__, __type__, __key__) \
static int __key__ ## _work( \
int noutput_items, \
gr_vector_const_void_star &input_items, \
gr_vector_void_star &output_items \
){ \
const __type__ *in = (const __type__ *) input_items[0]; \
__type__ *out = (__type__ *) output_items[0]; \
for (size_t i = 0; i < size_t(noutput_items); i++){ \
out[i] = std::__fcn__(in[i]); \
} \
return noutput_items; \
} \
gr_transcendental_registrant __key__ ## _registrant(#__key__, &__key__ ## _work, sizeof(__type__));
//register work functions for real types
#define REGISTER_REAL_FUNCTIONS(__fcn__) \
REGISTER_FUNCTION(__fcn__, float, __fcn__ ## _float) \
REGISTER_FUNCTION(__fcn__, double, __fcn__ ## _double)
//register work functions for complex types
#define REGISTER_COMPLEX_FUNCTIONS(__fcn__) \
REGISTER_FUNCTION(__fcn__, std::complex<float>, __fcn__ ## _complex_float) \
REGISTER_FUNCTION(__fcn__, std::complex<double>, __fcn__ ## _complex_double)
//register both complex and real
#define REGISTER_FUNCTIONS(__fcn__) \
REGISTER_REAL_FUNCTIONS(__fcn__) \
REGISTER_COMPLEX_FUNCTIONS(__fcn__)
//create and register transcendental work functions
REGISTER_FUNCTIONS(cos)
REGISTER_FUNCTIONS(sin)
REGISTER_FUNCTIONS(tan)
REGISTER_REAL_FUNCTIONS(acos)
REGISTER_REAL_FUNCTIONS(asin)
REGISTER_REAL_FUNCTIONS(atan)
REGISTER_FUNCTIONS(cosh)
REGISTER_FUNCTIONS(sinh)
REGISTER_FUNCTIONS(tanh)
REGISTER_FUNCTIONS(exp)
REGISTER_FUNCTIONS(log)
REGISTER_FUNCTIONS(log10)
REGISTER_FUNCTIONS(sqrt)
/***********************************************************************
* implementation block simply calls into the function pointer
**********************************************************************/
class gr_transcendental_impl : public gr_transcendental{
public:
gr_transcendental_impl(
const work_fcn_type &work_fcn, const size_t io_size
):
gr_sync_block(
"transcendental",
gr_make_io_signature(1, 1, io_size),
gr_make_io_signature(1, 1, io_size)
),
_work_fcn(work_fcn)
{
// NOP
}
int work(
int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items
){
return _work_fcn(noutput_items, input_items, output_items);
}
private:
const work_fcn_type &_work_fcn;
};
/***********************************************************************
* factory function to make transcendental block
**********************************************************************/
gr_transcendental::sptr gr_make_transcendental(
const std::string &name,
const std::string &type
){
//search for an entry in the map
const std::string key = name + "_" + type;
const bool has_key = get_map().count(key) != 0;
if (!has_key) throw std::runtime_error(
"could not find transcendental function for " + key
);
//make a new block with found work function
return gr_transcendental::sptr(new gr_transcendental_impl(
get_map()[key].work_fcn, get_map()[key].io_size
));
}
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