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/* -*- c++ -*- */
/*
* Copyright 2003 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gr_math.h>
#include <math.h>
/*
* Greatest Common Divisor, using Euclid's algorithm.
* [There are faster algorithms. See Knuth 4.5.2 if you care]
*/
long
gr_gcd (long m, long n)
{
if (m < 0)
m = -m;
if (n < 0)
n = -n;
while (n != 0){
long t = m % n;
m = n;
n = t;
}
return m;
}
/*
* These really need some configure hacking to figure out the right answer.
* As a stop gap, try for a macro, and if not that, then try std::
*/
// returns a non-zero value if value is "not-a-number" (NaN), and 0 otherwise
#if defined(isnan) || !defined(CXX_HAS_STD_ISNAN)
int
gr_isnan (double value)
{
return isnan (value);
}
#else
int
gr_isnan (double value)
{
return std::isnan (value);
}
#endif
// returns a non-zero value if the value of x has its sign bit set.
//
// This is not the same as `x < 0.0', because IEEE 754 floating point
// allows zero to be signed. The comparison `-0.0 < 0.0' is false, but
// `gr_signbit (-0.0)' will return a nonzero value.
#ifdef signbit
int
gr_signbit (double x)
{
return signbit (x);
}
#else
int
gr_signbit (double x)
{
return std::signbit (x);
}
#endif
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