added Profiler to analyses the time used by code lines

QtMeshViewer/Header/Profiler.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#ifdef _DEBUG
+	#include <QElapsedTimer.h>
+	#include <iostream>
+	#define TIC Profiler::getInstance().startTimer();
+	#define TOC Profiler::getInstance().takeTime();
+
+	class Profiler
+	{
+	private:
+		Profiler() { timer.start(); };
+
+		QElapsedTimer timer;
+
+	public:
+		~Profiler() {};
+
+		static Profiler& getInstance() {
+			static Profiler instance;
+			return instance;
+		}
+
+		void startTimer() {
+			timer.restart();
+		};
+
+		void takeTime() {
+			std::cout << "time elapsed: " << timer.elapsed() << std::endl;
+		};
+	};
+
+#else
+	#define TIC
+	#define TOC
+#endif