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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_eeopd1qbol81a8h925vgme5mna, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
sclass Cache<A> {
  O maker; // func -> A
  A value;
  long loaded;
  sbool debug;
  
  *() {}
  *(O *maker) {}

  synchronized A get() {
    if (loaded == 0) {
      value = (A) callF(maker);
      loaded = sysNow();
    }
    ret value;
  }

  synchronized void clear {
    if (debug && loaded != 0)
      print("Clearing cache");
    value = null;
    loaded = 0;
  }

  // clear if older than x seconds
  // 0 does not do anything
  synchronized void clear(double seconds) {
    if (seconds != 0 && loaded != 0 && sysNow() >= loaded+seconds*1000)
      clear();
  }
}