added timer facility

[l2e.git] / src / app / Timer.h

diff --git a/src/app/Timer.h b/src/app/Timer.h
new file mode 100644 (file)
index 0000000..465ed64
--- /dev/null
+++ b/src/app/Timer.h
@@ -0,0 +1,100 @@
+/*
+ * Timer.h
+ *
+ *  Created on: Aug 10, 2012
+ *      Author: holy
+ */
+
+#ifndef APP_TIMER_H_
+#define APP_TIMER_H_
+
+#include <algorithm>
+#include <list>
+
+namespace app {
+
+template<class Time>
+struct TimerData {
+
+       TimerData() : time(0), target(0), refCount(0) { }
+       TimerData(Time target) : time(0), target(target), refCount(0) { }
+
+       Time time;
+       Time target;
+       int refCount;
+
+};
+
+
+template<class Time>
+class Timer {
+
+public:
+       Timer() : data(0) { }
+       ~Timer() { if (data) --data->refCount; }
+       Timer(TimerData<Time> *data) : data(data) { ++data->refCount; }
+       Timer(const Timer<Time> &other)
+       : data(other.data) { if (data) ++(data->refCount); }
+       Timer<Time> &operator =(const Timer<Time> &other) {
+               Timer<Time> temp(other);
+               Swap(temp);
+               return *this;
+       }
+       void Swap(Timer<Time> &other) {
+               std::swap(data, other.data);
+       }
+
+public:
+       bool Running() const {
+               return data;
+       }
+       bool Finished() const {
+               return data ? data->time >= data->target : false;
+       }
+       Time Elapsed() const {
+               return data ? data->time : Time();
+       }
+       Time Remaining() const {
+               return data ? (data->target - data->time) : Time();
+       }
+
+private:
+       TimerData<Time> *data;
+
+};
+
+
+template<class Time>
+class Timers {
+
+public:
+       Timers() { }
+
+public:
+       void Update(Time delta) {
+               for (typename std::list<TimerData<Time> >::iterator i(data.begin()), end(data.end()); i != end;) {
+                       i->time += delta;
+                       if (i->refCount <= 0) {
+                               i = data.erase(i);
+                       } else {
+                               ++i;
+                       }
+               }
+       }
+       Timer<Time> StartTimer() {
+               data.push_back(TimerData<Time>());
+               return Timer<Time>(&data.back());
+       }
+       Timer<Time> StartCountdown(Time duration) {
+               data.push_back(TimerData<Time>(duration));
+               return Timer<Time>(&data.back());
+       }
+
+private:
+       std::list<TimerData<Time> > data;
+
+};
+
+}
+
+#endif /* APP_TIMER_H_ */