flower/include/real.hh

   1 /*
   2   real.hh -- declare Real
   3
   4   source file of the Flower Library
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #ifndef REAL_HH
  11 #define REAL_HH
  12
  13
  14 #include <limits.h>
  15
  16 typedef double Real;
  17 extern const Real infinity_f;
  18
  19 template<class T> inline T abs (T x)
  20 {
  21   return x > 0 ? x : -x;
  22 }
  23
  24 template<class T> inline int sign (T x)
  25 {
  26   if (x)
  27     return x > T(0) ? 1 : -1;
  28   return 0;
  29 }
  30
  31 template<class T> inline T max (T x, T y)
  32 {
  33   return x >? y;
  34 }
  35
  36 template<class T> inline T sqr (T x)
  37 {
  38   return x*x;
  39 }
  40
  41
  42 template<class T> inline T min (T x, T y)
  43 {
  44   return x <? y;
  45 }
  46
  47 inline Real
  48 distance (Real x,Real y)
  49 {
  50     return abs (x-y);
  51 }
  52
  53 #endif