add time example file

examples/CMakeLists.txt

@@ -20,7 +20,7 @@ mel_example(comms_server)
 mel_example(virtual_daq)
 mel_example(serial)
 mel_example(csv)
-# mel_example(time)
+mel_example(time)
 
 # windows only examples
 if(WIN32)

examples/ex_time.cpp

@@ -0,0 +1,83 @@
+// MIT License
+//
+// MEL - Mechatronics Engine & Library
+// Copyright (c) 2019 Mechatronics and Haptic Interfaces Lab - Rice University
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// Author(s): Evan Pezent (epezent@rice.edu)
+
+#include <MEL/Core/Time.hpp>
+#include <MEL/Core/Clock.hpp>
+#include <MEL/Core/Timer.hpp>
+#include <MEL/Core/Console.hpp>   // for print
+#include <MEL/Utility/System.hpp> // for sleep
+
+using namespace mel;
+
+int main(int argc, char const *argv[])
+{
+
+    // Time
+
+    Time t1 = seconds(10);
+    Time t2 = milliseconds(10);
+    Time t3 = t1 + t2;
+    if (t1 > t2)    
+        print(t3);
+
+    double t1_s  = t1.as_seconds();
+    int32  t2_ms = t2.as_milliseconds();
+    int64  t3_us = t3.as_microseconds();
+
+    // Frequency
+
+    Frequency f1 = hertz(1000);
+    Frequency f2 = t2.to_frequency();
+    print(f1,f2); 
+
+    // Clock
+
+    Clock clock;
+    sleep(seconds(1));
+    Time time1 = clock.get_elapsed_time();
+    sleep(seconds(1));
+    Time time2 = clock.restart();
+    sleep(seconds(1));
+    Time time3 = clock.get_elapsed_time();
+    print(time1, time2, time3);
+
+    // Timer
+
+    Timer timer1(seconds(1));
+    time1 = timer1.wait();
+    time2 = timer1.wait();
+    time3 = timer1.wait();
+    print(time1, time2, time3);
+
+    Timer hybrid_timer(milliseconds(10), Timer::WaitMode::Hybrid);
+    print(hybrid_timer.wait());
+
+    // Time loops
+
+    Time t = Time::Zero;
+    Timer timer(hertz(1000));
+    while (t < seconds(60)) {
+        // code which executes in less than one millisecond
+        t = timer.wait();
+    }
+
+
+
+
+
+    return 0;
+}