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Task/Time-a-function/D/time-a-function-2.d

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+import tango.io.Stdout;
+import tango.time.Clock;
+
+int identity (int x)
+{
+    return x;
+}
+
+int sum (int num)
+{
+    for (int i = 0; i < 1000000; i++)
+      num += i;
+    return num;
+}
+
+double timeIt(int function(int) func, int arg)
+{
+    long before = Clock.now.ticks;
+    func(arg);
+    return (Clock.now.ticks - before) / cast(double)TimeSpan.TicksPerSecond;
+}
+
+void main ()
+{
+    Stdout.format("Identity(4) takes {:f6} seconds",timeIt(&identity,4)).newline;
+    Stdout.format("Sum(4) takes {:f6} seconds",timeIt(&sum,4)).newline;
+}