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 Library General Public
14 // License along with this library; if not, write to the
15 // Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 // Boston, MA 02111-1307, USA.
27 static T pi() { return T(3.1415926535897932384626433832795029L); }
28 static T min(const T& a, const T& b)
29 { return a < b ? a : b; }
30 static T min(const T& a, const T& b, const T& c)
31 { return min(min(a, b), c); }
32 static T min(const T& a, const T& b, const T& c, const T& d)
33 { return min(min(min(a, b), c), d); }
34 static T max(const T& a, const T& b)
35 { return a > b ? a : b; }
36 static T max(const T& a, const T& b, const T& c)
37 { return max(max(a, b), c); }
38 static T max(const T& a, const T& b, const T& c, const T& d)
39 { return max(max(max(a, b), c), d); }
40 static int sign(const T& a)
42 if (a < -SGLimits<T>::min())
44 else if (SGLimits<T>::min() < a)
50 static T rad2deg(const T& val)
51 { return val*180/pi(); }
52 static T deg2rad(const T& val)
53 { return val*pi()/180; }
56 /// Returns true if v is a NaN value
57 /// Use with care: allways code that you do not need to use that!
58 static bool isNaN(const T& v)
62 #elif defined HAVE_STD_ISNAN
65 // Use that every compare involving a NaN returns false
66 // But be careful, some usual compiler switches like for example
67 // -fast-math from gcc might optimize that expression to v != v which
68 // behaves exactly like the opposite ...
75 typedef SGMisc<float> SGMiscf;
76 typedef SGMisc<double> SGMiscd;