chore: Add course material

397/SolutionEx71ABonus/TimerSet.cpp

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+#include "TimerSet.h"
+#include "Timer.h"
+#include <iostream>
+
+//  Member functions
+
+TimerSet::TimerSet()
+    : previousTime(time(&previousTime)), pollingThread([this]() { poll10Hz(); }) // Exercise 5.1 start thread
+{
+    pollingThread.detach(); // let it die on its own, without join
+}
+
+// Exercise 5.1 new function
+void TimerSet::poll10Hz() {
+    std::chrono::duration<int, std::milli> pause(100);
+    while (true) {
+        std::this_thread::sleep_for(pause);
+        pollAllTimers();
+    }
+}
+
+void TimerSet::addATimer(Timer *t) { timers.push_back(t); }
+
+void TimerSet::pollAllTimers() {
+    std::time_t timeNow;
+    if (time(&timeNow) > previousTime) {
+        previousTime = timeNow;
+        for (auto it = timers.begin(); it != timers.end(); it++) {
+            (*it)->tick();
+        }
+    }
+}
+
+TimerSet &TimerSet::Instance() {
+    static TimerSet pInstance;
+    return pInstance;
+}