update code

include/PrecisionTimer.h

@@ -0,0 +1,34 @@
+#pragma once
+#include <chrono>
+
+class CPrecisionTimer
+{
+public:
+	using Clock = std::chrono::high_resolution_clock;
+	using TimePoint = Clock::time_point;
+	using Nanoseconds = std::chrono::nanoseconds;
+
+	void start() {
+		m_start = Clock::now();
+	}
+
+	Nanoseconds stop() {
+		return Clock::now() - m_start;
+	}
+
+	static double toSeconds(Nanoseconds ns) {
+		return ns.count() / 1e9;
+	}
+
+	static double toMilliseconds(Nanoseconds ns) {
+		return ns.count() / 1e6;
+	}
+
+	static double toMicrosecond(Nanoseconds ns) {
+		return ns.count() / 1e3;
+	}
+
+private:
+	TimePoint m_start;
+};
+