include/Math.hpp

   1 #ifndef SCX_ROUNDOFF_HPP
   2 #define SCX_ROUNDOFF_HPP
   3
   4 #include <cmath>
   5 #include <sstream>
   6 using namespace std;
   7
   8 namespace scx {
   9
  10 static inline double RoundOff(double num, int n)
  11 {
  12     int scale = pow((double)10, n);
  13     num += 0.5 * pow((double)0.1, n);
  14     num *= scale;
  15     num = (int)num;
  16     num /= scale;
  17     return num;
  18 }
  19
  20 template<class T>
  21 static inline bool IsOdd(T n)
  22 {
  23     return (n & 1);
  24 }
  25
  26 template<class T>
  27 static inline bool IsEven(T n)
  28 {
  29     return !(n & 1);
  30 }
  31
  32 // only for unsigned
  33 template<class T>
  34 static inline bool Is2Exp(T n)
  35 {
  36     return !(n & (n-1));
  37 }
  38
  39 template<typename T>
  40 static inline bool Not2Exp(T n)
  41 {
  42     return (n & (n-1));
  43 }
  44
  45 }
  46
  47 #endif