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diff --git a/trunk/src/common/include/gudhi/Clock.h b/trunk/src/common/include/gudhi/Clock.h
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+++ b/trunk/src/common/include/gudhi/Clock.h
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+/*    This file is part of the Gudhi Library. The Gudhi library 
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++ 
+ *    library for computational topology.
+ *
+ *    Author(s):       David Salinas
+ *
+ *    Copyright (C) 2014  INRIA Sophia Antipolis-Mediterranee (France)
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef CLOCK_H_
+#define CLOCK_H_
+
+#include <iostream>
+#include <string>
+#include <chrono>
+
+namespace Gudhi {
+
+class Clock {
+ public:
+  // Construct and start the timer
+  Clock(const std::string& msg_ = std::string())
+      : startTime(std::chrono::system_clock::now()),
+      end_called(false),
+      msg(msg_) { }
+
+  // Restart the timer
+  void begin() const {
+    end_called = false;
+    startTime = std::chrono::system_clock::now();
+  }
+
+  // Stop the timer
+  void end() const {
+    end_called = true;
+    endTime = std::chrono::system_clock::now();
+  }
+
+  std::string message() const {
+    return msg;
+  }
+
+  // Print current value to std::cout
+  void print() const {
+    std::cout << *this << std::endl;
+  }
+
+  friend std::ostream& operator<<(std::ostream& stream, const Clock& clock) {
+    if (!clock.msg.empty())
+      stream << clock.msg << ": ";
+
+    stream << clock.num_seconds() << "s\n";
+    return stream;
+  }
+
+  // Get the number of seconds between the timer start and:
+  // - the last call of end() if it was called
+  // - or now otherwise. In this case, the timer is not stopped.
+  double num_seconds() const {
+    if (!end_called) {
+      auto end = std::chrono::system_clock::now();
+      return std::chrono::duration_cast<std::chrono::milliseconds>(end-startTime).count() / 1000.;
+    } else {
+      return std::chrono::duration_cast<std::chrono::milliseconds>(endTime-startTime).count() / 1000.;
+    }
+  }
+
+ private:
+  mutable std::chrono::time_point<std::chrono::system_clock> startTime, endTime;
+  mutable bool end_called;
+  std::string msg;
+};
+
+}  // namespace Gudhi
+
+#endif   // CLOCK_H_