Add time

libraries/http_server/http_server/timer.hh

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <chrono>
+
+namespace li
+{
+
+class timer {
+public:
+  inline void start() { start_ = std::chrono::high_resolution_clock::now(); }
+  inline void end() { end_ = std::chrono::high_resolution_clock::now(); }
+
+  inline unsigned long us() const {
+    return std::chrono::duration_cast<std::chrono::microseconds>(end_ - start_).count();
+  }
+
+  inline unsigned long ms() const {
+    return std::chrono::duration_cast<std::chrono::milliseconds>(end_ - start_).count();
+  }
+
+  inline unsigned long ns() const {
+    return std::chrono::duration_cast<std::chrono::nanoseconds>(end_ - start_).count();
+  }
+
+private:
+  std::chrono::time_point<std::chrono::high_resolution_clock> start_, end_;
+};
+
+}