From 70c2c746a18b7841621f5fcf932d3bbe0b4cb658 Mon Sep 17 00:00:00 2001
From: vng <viktor.govako@gmail.com>
Date: Wed, 15 Oct 2014 12:13:53 +0300
Subject: [PATCH] [core] Added HighResTimer for benchmarks.

---
 base/timer.cpp | 16 ++++++++++++++++
 base/timer.hpp | 15 +++++++++++++++
 std/chrono.hpp | 16 ++++++++++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 std/chrono.hpp

diff --git a/base/timer.cpp b/base/timer.cpp
index a00d86e540..3f03536c52 100644
--- a/base/timer.cpp
+++ b/base/timer.cpp
@@ -157,4 +157,20 @@ time_t StringToTimestamp(string const & s)
   return res;
 }
 
+HighResTimer::HighResTimer(bool start/* = true*/)
+{
+  if (start)
+    Reset();
+}
+
+void HighResTimer::Reset()
+{
+  m_start = high_resolution_clock::now();
+}
+
+uint64_t HighResTimer::ElapsedNano() const
+{
+  return duration_cast<nanoseconds>(high_resolution_clock::now() - m_start).count();
+}
+
 }
diff --git a/base/timer.hpp b/base/timer.hpp
index b465ec7294..cc6d0c4a12 100644
--- a/base/timer.hpp
+++ b/base/timer.hpp
@@ -3,6 +3,7 @@
 #include "../std/stdint.hpp"
 #include "../std/string.hpp"
 #include "../std/ctime.hpp"
+#include "../std/chrono.hpp"
 
 
 namespace my
@@ -37,4 +38,18 @@ time_t const INVALID_TIME_STAMP = -1;
 /// @return INVALID_TIME_STAMP if string is invalid
 time_t StringToTimestamp(string const & s);
 
+
+/// High resolution timer to use in comparison tests.
+class HighResTimer
+{
+  typedef high_resolution_clock::time_point PointT;
+  PointT m_start;
+
+public:
+  explicit HighResTimer(bool start = true);
+
+  void Reset();
+  uint64_t ElapsedNano() const;
+};
+
 }
diff --git a/std/chrono.hpp b/std/chrono.hpp
new file mode 100644
index 0000000000..b775ea3a02
--- /dev/null
+++ b/std/chrono.hpp
@@ -0,0 +1,16 @@
+#pragma once
+#include "common_defines.hpp"
+
+#ifdef new
+#undef new
+#endif
+
+#include <chrono>
+
+using std::chrono::high_resolution_clock;
+using std::chrono::nanoseconds;
+using std::chrono::duration_cast;
+
+#ifdef DEBUG_NEW
+#define new DEBUG_NEW
+#endif