1 // Copyright (C) 2006 Mathias Froehlich - Mathias.Froehlich@web.de
3 // This library is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU Library General Public
5 // License as published by the Free Software Foundation; either
6 // version 2 of the License, or (at your option) any later version.
8 // This library is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 // Library General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program; if not, write to the Free Software
15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26 static T pi() { return T(3.1415926535897932384626433832795029L); }
27 static T min(const T& a, const T& b)
28 { return a < b ? a : b; }
29 static T min(const T& a, const T& b, const T& c)
30 { return min(min(a, b), c); }
31 static T min(const T& a, const T& b, const T& c, const T& d)
32 { return min(min(min(a, b), c), d); }
33 static T max(const T& a, const T& b)
34 { return a > b ? a : b; }
35 static T max(const T& a, const T& b, const T& c)
36 { return max(max(a, b), c); }
37 static T max(const T& a, const T& b, const T& c, const T& d)
38 { return max(max(max(a, b), c), d); }
39 static int sign(const T& a)
41 if (a < -SGLimits<T>::min())
43 else if (SGLimits<T>::min() < a)
49 static T rad2deg(const T& val)
50 { return val*180/pi(); }
51 static T deg2rad(const T& val)
52 { return val*pi()/180; }
55 /// Returns true if v is a NaN value
56 /// Use with care: allways code that you do not need to use that!
57 static bool isNaN(const T& v)
61 #elif defined HAVE_STD_ISNAN
64 // Use that every compare involving a NaN returns false
65 // But be careful, some usual compiler switches like for example
66 // -fast-math from gcc might optimize that expression to v != v which
67 // behaves exactly like the opposite ...
74 typedef SGMisc<float> SGMiscf;
75 typedef SGMisc<double> SGMiscd;