src/app/Timer.h

   1 /*
   2  * Timer.h
   3  *
   4  *  Created on: Aug 10, 2012
   5  *      Author: holy
   6  */
   7
   8 #ifndef APP_TIMER_H_
   9 #define APP_TIMER_H_
  10
  11 #include <algorithm>
  12 #include <list>
  13
  14 namespace app {
  15
  16 template<class Time>
  17 struct TimerData {
  18
  19         TimerData() : time(0), target(0), refCount(0) { }
  20         TimerData(Time target) : time(0), target(target), refCount(0) { }
  21
  22         Time time;
  23         Time target;
  24         int refCount;
  25
  26 };
  27
  28
  29 template<class Time>
  30 class Timer {
  31
  32 public:
  33         Timer() : data(0) { }
  34         ~Timer() { if (data) --data->refCount; }
  35         Timer(TimerData<Time> *data) : data(data) { ++data->refCount; }
  36         Timer(const Timer<Time> &other)
  37         : data(other.data) { if (data) ++(data->refCount); }
  38         Timer<Time> &operator =(const Timer<Time> &other) {
  39                 Timer<Time> temp(other);
  40                 Swap(temp);
  41                 return *this;
  42         }
  43         void Swap(Timer<Time> &other) {
  44                 std::swap(data, other.data);
  45         }
  46
  47 public:
  48         bool Running() const {
  49                 return data;
  50         }
  51         bool Finished() const {
  52                 return data ? data->time >= data->target : false;
  53         }
  54         Time Elapsed() const {
  55                 return data ? data->time : Time();
  56         }
  57         Time Remaining() const {
  58                 return data ? (data->target - data->time) : Time();
  59         }
  60
  61 private:
  62         TimerData<Time> *data;
  63
  64 };
  65
  66
  67 template<class Time>
  68 class Timers {
  69
  70 public:
  71         Timers() { }
  72
  73 public:
  74         void Update(Time delta) {
  75                 for (typename std::list<TimerData<Time> >::iterator i(data.begin()), end(data.end()); i != end;) {
  76                         i->time += delta;
  77                         if (i->refCount <= 0) {
  78                                 i = data.erase(i);
  79                         } else {
  80                                 ++i;
  81                         }
  82                 }
  83         }
  84         Timer<Time> StartTimer() {
  85                 data.push_back(TimerData<Time>());
  86                 return Timer<Time>(&data.back());
  87         }
  88         Timer<Time> StartCountdown(Time duration) {
  89                 data.push_back(TimerData<Time>(duration));
  90                 return Timer<Time>(&data.back());
  91         }
  92
  93 private:
  94         std::list<TimerData<Time> > data;
  95
  96 };
  97
  98 }
  99
 100 #endif /* APP_TIMER_H_ */