Timer

[Dejan Lekic]

On Monday, 17 February 2014 at 11:08:16 UTC, Chris wrote:
> The D way of implementing a timer? I need to (automatically) 
> execute a function that performs a clean up, say every hour.
>
> if (file.older than 1 hour) {
>     remove;
> }

Here is a quick timer implementation that you can improve 
yourself:

import std.stdio;
import core.thread;

class ChrisTimer : Thread {
     private void delegate() funcToRun;
     private long timeToWait;
     private bool done = false;
     private int noSheep;
     private Duration howLong;

     // We could make any function a parameter to ChrisTimer if we 
had a
     // constructor like:
     // this(void delegate() dg, long ms) {

     this(long ms) {
         funcToRun = &doSomething;
         timeToWait = ms;
         howLong = dur!("msecs")(timeToWait);
         funcToRun = &doSomething;
         super(&run);
     }

     private void run() {
         while (isRunning && !done) {
             funcToRun();
             sleep(howLong);
         }
     }

     // Example function that is just going to count sheep (up to 
10).
     public void doSomething() {
         ++noSheep;
         writeln("Counted ", noSheep, " sheep.");
         if (noSheep >= 10) {
             done = true;
         }
     }

} // ChrisThread class

int main(string[] args) {
     auto ct = new ChrisTimer(2000);
     ct.start();

     return 0;
}