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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_7fhq8gcpc6u8pts6lsjsk3mpbm, 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 />
<A> bool addAndChange(Cl<A> cl, A a) {
  if (cl == null || !cl.add(a)) false;
  change();
  true;
}

void <A> clearAndChange(Cl<A> cl) {
  if (cl == null) ret;
  cl.clear();
  change();
}

ifclass LongBuffer
void addAndChange(LongBuffer buf, long a) {
  if (buf == null) ret;
  buf.add(a);
  change();
}

void clearAndChange(LongBuffer buf) {
  if (buf == null) ret;
  buf.clear();
  change();
}
endif