1 files changed, 77 insertions, 0 deletions
diff --git a/src/common/include/gudhi/Clock.h b/src/common/include/gudhi/Clock.h
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+++ b/src/common/include/gudhi/Clock.h
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+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       David Salinas
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#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_