Method getAndDecrement

output/java_guava/1.4.19/AtomicLongMap.java:159–162

Decrements by one the value currently associated with key, and returns the old value.

(K key)

   */

  @CanIgnoreReturnValue
  public long getAndDecrement(K key) {
    return getAndAdd(key, -1);
  }

  /**
   * Adds {@code delta} to the value currently associated with {@code key}, and returns the old