3 * Copyright 2003 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
31 * Greatest Common Divisor, using Euclid's algorithm.
32 * [There are faster algorithms. See Knuth 4.5.2 if you care]
36 gr_gcd (long m, long n)
55 * These really need some configure hacking to figure out the right answer.
56 * As a stop gap, try for a macro, and if not that, then try std::
59 // returns a non-zero value if value is "not-a-number" (NaN), and 0 otherwise
61 #if defined(isnan) || !defined(CXX_HAS_STD_ISNAN)
64 gr_isnan (double value)
72 gr_isnan (double value)
74 return std::isnan (value);
79 // returns a non-zero value if the value of x has its sign bit set.
81 // This is not the same as `x < 0.0', because IEEE 754 floating point
82 // allows zero to be signed. The comparison `-0.0 < 0.0' is false, but
83 // `gr_signbit (-0.0)' will return a nonzero value.
98 return std::signbit (x);