Merge pull request #593 from leapmotion/feature-chrono-ext

Added basic_timer.h and chrono_types.h

autowiring/basic_timer.h

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+// Copyright (C) 2012-2015 Leap Motion, Inc. All rights reserved.
+#pragma once
+#include <chrono>
+
+template<class clock_t, class duration_t = typename clock_t::duration>
+class basic_timer {
+public:
+  basic_timer(const typename clock_t::time_point& initial = clock_t::now()) : m_start(initial) {}
+
+  //A convenient method to avoid having to use duration_cast all the time.
+  duration_t now() const { return std::chrono::duration_cast<duration_t>(clock_t::now().time_since_epoch()); }
+  duration_t elapsed() const { return std::chrono::duration_cast<duration_t>(clock_t::now() - m_start); }
+  typename clock_t::time_point start_time() const { return m_start; }
+
+  void start() { m_start = clock_t::now(); }
+  duration_t mark() {
+    const auto now = clock_t::now();
+    const auto oldStart = m_start;
+    m_start = now;
+    return std::chrono::duration_cast<duration_t>(now - oldStart);
+  }
+private:
+  typename clock_t::time_point m_start;
+};
+

autowiring/chrono_types.h

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+// Copyright (C) 2012-2015 Leap Motion, Inc. All rights reserved.
+#pragma once
+#include <autowiring/C++11/cpp11.h>
+#include CHRONO_HEADER
+#include "chrono_timer.h"
+
+//Common chrono types
+typedef std::chrono::duration<double> seconds_d;
+typedef std::chrono::duration<double, std::milli> milliseconds_d;
+typedef std::chrono::duration<double, std::micro> microseconds_d;
+typedef std::chrono::duration<double, std::nano> nanoseconds_d;
+
+typedef std::chrono::duration<float> seconds_f;
+typedef std::chrono::duration<float, std::milli> milliseconds_f;
+typedef std::chrono::duration<float, std::micro> microseconds_f;
+typedef std::chrono::duration<float, std::nano> nanoseconds_f;
+
+typedef basic_timer<std::chrono::profiling_clock> profiling_timer;
+typedef basic_timer<std::chrono::profiling_clock, seconds_d> profiling_timer_seconds;
+typedef basic_timer<std::chrono::profiling_clock, milliseconds_d> profiling_timer_milliseconds;
+typedef basic_timer<std::chrono::profiling_clock, microseconds_d> profiling_timer_microseconds;