Class Long2DoubleFunctions.Singleton

  • All Implemented Interfaces:
    Function<java.lang.Long,​java.lang.Double>, Long2DoubleFunction, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<java.lang.Long,​java.lang.Double>, java.util.function.LongToDoubleFunction
    Direct Known Subclasses:
    Long2DoubleMaps.Singleton
    Enclosing class:
    Long2DoubleFunctions

    public static class Long2DoubleFunctions.Singleton
    extends AbstractLong2DoubleFunction
    implements java.io.Serializable, java.lang.Cloneable
    An immutable class representing a type-specific singleton function. Note that the default return value is still settable.

    Note that albeit the function is immutable, its default return value may be changed.

    This class may be useful to implement your own in case you subclass a type-specific function.

    See Also:
    Serialized Form
    • Method Detail

      • containsKey

        public boolean containsKey​(long k)
        Description copied from interface: Long2DoubleFunction
        Returns true if this function contains a mapping for the specified key.

        Note that for some kind of functions (e.g., hashes) this method will always return true. In particular, this default implementation always returns true.

        Specified by:
        containsKey in interface Long2DoubleFunction
        Parameters:
        k - the key.
        Returns:
        true if this function associates a value to key.
        See Also:
        Function.containsKey(Object)
      • size

        public int size()
        Description copied from interface: Function
        Returns the intended number of keys in this function, or -1 if no such number exists.

        Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible. This default implementation, in particular, returns -1.

        Specified by:
        size in interface Function<java.lang.Long,​java.lang.Double>
        Returns:
        the intended number of keys in this function, or -1 if that number is not available.
      • clone

        public java.lang.Object clone()