Method addAll

corpus/java/training/guava/collect/Iterables.java:358–365

Adds all elements in iterable to collection. @return true if collection was modified as a result of this operation.

(Collection<T> addTo, Iterable<? extends T> elementsToAdd)

   *     operation.
   */
  @CanIgnoreReturnValue
  public static <T> boolean addAll(Collection<T> addTo, Iterable<? extends T> elementsToAdd) {
    if (elementsToAdd instanceof Collection) {
      Collection<? extends T> c = Collections2.cast(elementsToAdd);
      return addTo.addAll(c);
    }
    return Iterators.addAll(addTo, checkNotNull(elementsToAdd).iterator());
  }

  /**
   * Returns the number of elements in the specified iterable that equal the