flower/include/real.hh

   1 /*
   2   real.hh -- declare Real
   3
   4   source file of the Flower Library
   5
   6   (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #ifndef REAL_HH
  10 #define REAL_HH
  11
  12 #include <algorithm>
  13 #include <climits>
  14
  15 typedef double Real;
  16 extern const Real infinity_f;
  17 using namespace std;
  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 sqr (T x)
  32 {
  33   return x * x;
  34 }
  35
  36 inline Real
  37 distance (Real x, Real y)
  38 {
  39   return abs (x - y);
  40 }
  41
  42 #endif