## Uses of Interface
java.util.function.DoubleToLongFunction

- Packages that use DoubleToLongFunction
  Package | Description
  --- | ---
  java.util.stream | Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.

- - ### Uses of DoubleToLongFunction in java.util.stream

    Methods in java.util.stream with parameters of type DoubleToLongFunction
    Modifier and Type | Method | Description
    --- | --- | ---
    `LongStream` | DoubleStream.`mapToLong​(DoubleToLongFunction mapper)` | Returns a `LongStream` consisting of the results of applying the given function to the elements of this stream.