Added some classes from a stackoverflow to utilize Qt's concurrency functions especially cancellable QFuture's

core/RunControllableTask.h

@@ -0,0 +1,45 @@
+#ifndef RUNCONTROLLABLETASK_H
+#define RUNCONTROLLABLETASK_H
+/** From answer by Hatter
+ *
+ * https://stackoverflow.com/questions/5423058/qfuture-that-can-be-cancelled-and-report-progress
+ */
+
+#include <QFutureInterface>
+#include <QRunnable>
+#include "ControllableTask.h"
+
+template <typename T>
+class RunControllableTask : public QFutureInterface<T> , public QRunnable
+{
+public:
+	RunControllableTask(ControllableTask<T>* tsk) : task(tsk) { }
+	virtial ~RunControllableTask() { delete task; }
+
+	QFuture<T> start()
+	{
+		this->setRunnable(this);
+		this->reportStarted();
+		QFuture<T> future = this->future();
+		QThreadPool::globalInstance()->start(this, /*m_priority*/ 0);
+		return future;
+	}
+
+	void run()
+	{
+		if (this->isCanceled()) {
+			this->reportFinished();
+			return;
+		}
+		TaskControl control(this);
+		result = this->task->run(control);
+		if (!this->isCanceled()) {
+			this->reportResult(result);
+		}
+		this->reportFinished();
+	}
+
+	T  result;
+	ControllableTask<T> *task;
+};
+#endif // RUNCONTROLLABLETASK_H