include/library/minmax.hpp

   1 #ifndef _library__minmax__hpp__included__
   2 #define _library__minmax__hpp__included__
   3
   4 #include <map>
   5
   6 /**
   7  * Return minimum of a and b.
   8  */
   9 template<typename T> T min(T a, T b)
  10 {
  11         return (a < b) ? a : b;
  12 }
  13
  14 /**
  15  * Return maximum of a and b.
  16  */
  17 template<typename T> T max(T a, T b)
  18 {
  19         return (a < b) ? b : a;
  20 }
  21
  22 /**
  23  * Clip v to [a,b].
  24  */
  25 template<typename T> T clip(T v, T a, T b)
  26 {
  27         return (v < a) ? a : ((v > b) ? b : v);
  28 }
  29
  30 template<typename T, typename U>
  31 class pair_assign_helper
  32 {
  33 public:
  34         pair_assign_helper(T& _a, U& _b) : a(_a), b(_b) {}
  35         const std::pair<T, U>& operator=(const std::pair<T, U>& r)
  36         {
  37                 a = r.first;
  38                 b = r.second;
  39                 return r;
  40         }
  41 private:
  42         T& a;
  43         U& b;
  44 };
  45
  46 /**
  47  * Create a rvalue from components of pair.
  48  */
  49 template<typename T, typename U>
  50 pair_assign_helper<T, U> rpair(T& a, U& b)
  51 {
  52         return pair_assign_helper<T, U>(a, b);
  53 }
  54
  55
  56
  57 #endif