export class AtomicReference<A> {
   private current: A;
   constructor(readonly initial: A) {
      this.current = initial;
   }

   get get() {
      return this.current;
   }

   set(value: A) {
      this.current = value;
   }

   compareAndSet(old: A, value: A) {
      if (this.get === old) {
         this.set(value);
         return true;
      }
      return false;
   }
}