enh(Poco::Util::Timer): Add idle() method to check if timer has any tasks scheduled #4488

Util/include/Poco/Util/Timer.h

@@ -159,6 +159,9 @@ public:
 		/// If task execution takes longer than the given interval,
 		/// further executions are delayed.
 
+	bool idle() const;
+		/// Returns true if the task queue is empty, otherwise false.
+
 	template <typename Fn>
 	static TimerTask::Ptr func(const Fn& fn)
 		/// Helper function template to use a functor or lambda
@@ -188,6 +191,15 @@ private:
 };
 
 
+//
+// inlines
+//
+inline bool Timer::idle() const
+{
+	return _queue.empty();
+}
+
+
 } } // namespace Poco::Util