• package root

    This is the documentation for the Scala standard library.

    This is the documentation for the Scala standard library.

    Package structure

    The scala package contains core types like Int, Float, Array or Option which are accessible in all Scala compilation units without explicit qualification or imports.

    Notable packages include:

    Other packages exist. See the complete list on the right.

    Additional parts of the standard library are shipped as separate libraries. These include:

    • scala.reflect - Scala's reflection API (scala-reflect.jar)
    • scala.xml - XML parsing, manipulation, and serialization (scala-xml.jar)
    • scala.collection.parallel - Parallel collections (scala-parallel-collections.jar)
    • scala.util.parsing - Parser combinators (scala-parser-combinators.jar)
    • scala.swing - A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)

    Automatic imports

    Identifiers in the scala package and the scala.Predef object are always in scope by default.

    Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example, List is an alias for scala.collection.immutable.List.

    Other aliases refer to classes provided by the underlying platform. For example, on the JVM, String is an alias for java.lang.String.

    Definition Classes
  • package scala

    Core Scala types.

    Core Scala types. They are always available without an explicit import.

    Definition Classes
  • package util
    Definition Classes
  • package control
    Definition Classes
  • package hashing
    Definition Classes
  • ByteswapHashing
  • Hashing
  • MurmurHash3
  • package matching
    Definition Classes



package hashing

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Type Members

  1. final class ByteswapHashing[T] extends Hashing[T]

    A fast multiplicative hash by Phil Bagwell.

  2. trait Hashing[T] extends Serializable

    Hashing is a trait whose instances each represent a strategy for hashing instances of a type.

    Hashing is a trait whose instances each represent a strategy for hashing instances of a type.

    Hashing's companion object defines a default hashing strategy for all objects - it calls their ## method.

    Note: when using a custom Hashing, make sure to use it with the Equiv such that if any two objects are equal, then their hash codes must be equal.

    @implicitNotFound("No implicit Hashing defined for ${T}.")


Value Members

  1. def byteswap32(v: Int): Int

    Fast multiplicative hash with a nice distribution.

  2. def byteswap64(v: Long): Long

    Fast multiplicative hash with a nice distribution for 64-bit values.

  3. object ByteswapHashing extends
  4. object Hashing extends
  5. object MurmurHash3 extends MurmurHash3

    An implementation of Austin Appleby's MurmurHash 3 algorithm (MurmurHash3_x86_32).

    An implementation of Austin Appleby's MurmurHash 3 algorithm (MurmurHash3_x86_32). This object contains methods that hash values of various types as well as means to construct Hashing objects.

    This algorithm is designed to generate well-distributed non-cryptographic hashes. It is designed to hash data in 32 bit chunks (ints).

    The mix method needs to be called at each step to update the intermediate hash value. For the last chunk to incorporate into the hash mixLast may be used instead, which is slightly faster. Finally finalizeHash needs to be called to compute the final hash value.

    This is based on the earlier MurmurHash3 code by Rex Kerr, but the MurmurHash3 algorithm was since changed by its creator Austin Appleby to remedy some weaknesses and improve performance. This represents the latest and supposedly final version of the algorithm (revision 136).

    See also

Inherited from AnyRef

Inherited from Any