Package it.unimi.dsi.fastutil.longs

Interface LongIterable

All Superinterfaces:
Iterable<Long>
All Known Subinterfaces:
LongBidirectionalIterable, LongBigList, LongCollection, LongList, LongSet, LongSortedSet
All Known Implementing Classes:
AbstractLongBigList, AbstractLongBigList.LongRandomAccessSubList, AbstractLongBigList.LongSubList, AbstractLongCollection, AbstractLongList, AbstractLongList.LongRandomAccessSubList, AbstractLongList.LongSubList, AbstractLongSet, AbstractLongSortedSet, LongArrayList, LongArraySet, LongAVLTreeSet, LongBigArrayBigList, LongBigLists.EmptyBigList, LongBigLists.ListBigList, LongBigLists.Singleton, LongBigLists.SynchronizedBigList, LongBigLists.UnmodifiableBigList, LongCollections.EmptyCollection, LongCollections.IterableCollection, LongImmutableList, LongLinkedOpenCustomHashSet, LongLinkedOpenHashSet, LongLists.EmptyList, LongLists.Singleton, LongLists.SynchronizedList, LongLists.SynchronizedRandomAccessList, LongLists.UnmodifiableList, LongLists.UnmodifiableRandomAccessList, LongMappedBigList, LongOpenCustomHashSet, LongOpenHashBigSet, LongOpenHashSet, LongRBTreeSet, LongSets.EmptySet, LongSets.Singleton, LongSets.SynchronizedSet, LongSets.UnmodifiableSet, LongSortedSets.EmptySet, LongSortedSets.Singleton, LongSortedSets.SynchronizedSortedSet, LongSortedSets.UnmodifiableSortedSet
public interface LongIterable extends Iterable<Long>
A type-specific Iterable that strengthens that specification of iterator() and forEach(Consumer).

Note that whenever there exist a primitive consumer in java.util.function (e.g., IntConsumer), trying to access any version of forEach(Consumer) using a lambda expression with untyped arguments will generate an ambiguous method error. This can be easily solved by specifying the type of the argument, as in 

    intIterable.forEach((int x) -> { // Do something with x });

The same problem plagues, for example, PrimitiveIterator.OfInt.forEachRemaining(java.util.function.IntConsumer).

Warning: Java will let you write “colon” for statements with primitive-type loop variables; however, what is (unfortunately) really happening is that at each iteration an unboxing (and, in the case of fastutil type-specific data structures, a boxing) will be performed. Watch out.

See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    default void
    forEach(LongConsumer action)
    Performs the given action for each element of this type-specific Iterable until all elements have been processed or the action throws an exception.
    default void
    forEach(Consumer<? super Long> action)
    Deprecated.
    Please use the corresponding type-specific method instead.
    default void
    forEach(LongConsumer action)
    Performs the given action for each element of this type-specific Iterable until all elements have been processed or the action throws an exception.
    LongIterator
    iterator()
    Returns a type-specific iterator.
    default LongIterator
    longIterator()
    Returns a primitive iterator on the elements of this iterable.
    default LongSpliterator
    longSpliterator()
    Returns a primitive spliterator on the elements of this iterable.
    default LongSpliterator
    spliterator()
    Returns a type-specific spliterator on the elements of this iterable.

  • Method Details

    • iterator

      LongIterator iterator()
      Returns a type-specific iterator.
      Specified by:
      iterator in interface Iterable<Long>
      Returns:
      a type-specific iterator.
      See Also:
      API Notes:
      Note that this specification strengthens the one given in Iterable.iterator().

    • longIterator

      default LongIterator longIterator()
      Returns a primitive iterator on the elements of this iterable.

      This method is identical to iterator(), as the type-specific iterator is already compatible with the JDK's primitive iterators. It only exists for compatibility with the other primitive types' Iterables that have use for widened iterators.

      Returns:
      a primitive iterator on the elements of this iterable.
      Since:
      8.5.0

    • spliterator

      default LongSpliterator spliterator()
      Returns a type-specific spliterator on the elements of this iterable.
      Specified by:
      spliterator in interface Iterable<Long>
      Returns:
      a type-specific spliterator on the elements of this iterable.
      Since:
      8.5.0
      API Notes:
      Note that this specification strengthens the one given in Iterable.spliterator().

    • longSpliterator

      default LongSpliterator longSpliterator()
      Returns a primitive spliterator on the elements of this iterable.

      This method is identical to spliterator(), as the type-specific spliterator is already compatible with the JDK's primitive spliterators. It only exists for compatibility with the other primitive types' Iterables that have use for widened spliterators.

      Returns:
      a primitive spliterator on the elements of this collection.
      Since:
      8.5.0

    • forEach

      default void forEach(LongConsumer action)
      Performs the given action for each element of this type-specific Iterable until all elements have been processed or the action throws an exception.
      Parameters:
      action - the action to be performed for each element.
      Since:
      8.0.0
      See Also:
      API Notes:
      Implementing classes should generally override this method, and take the default implementation of the other overloads which will delegate to this method (after proper conversions).

    • forEach

      default void forEach(LongConsumer action)
      Performs the given action for each element of this type-specific Iterable until all elements have been processed or the action throws an exception.

      WARNING: Overriding this method is almost always a mistake, as this overload only exists to disambiguate. Instead, override the forEach() overload that uses the JDK's primitive consumer type (e.g. IntConsumer).

      If Java supported final default methods, this would be one, but sadly it does not.

      If you checked and are overriding the version with java.util.function.XConsumer, and still see this warning, then your IDE is incorrectly conflating this method with the proper method to override, and you can safely ignore this message.

      Parameters:
      action - the action to be performed for each element.
      Since:
      8.5.0
      See Also:

    • forEach

      @Deprecated default void forEach(Consumer<? super Long> action)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Specified by:
      forEach in interface Iterable<Long>