- Companion
- class
- Source
- Ordering.scala
Type members
Inherited classlikes
This inner class defines comparison operators available for T.
This inner class defines comparison operators available for T.
It can't extend AnyVal because it is not a top-level class
or a member of a statically accessible object.
- Inherited from
- Ordering
- Source
- Ordering.scala
Value members
Inherited methods
Returns whether or not the other ordering is the opposite ordering of this one.
Returns whether or not the other ordering is the opposite ordering of this one.
Equivalent to other == this.reverse.
Implementations should only override this method if they are overriding reverse as well.
- Inherited from
- Ordering
- Source
- Ordering.scala
Given f, a function from U into T, creates an Ordering[U] whose compare function is equivalent to:
Given f, a function from U into T, creates an Ordering[U] whose compare function is equivalent to:
def compare(x:U, y:U) = Ordering[T].compare(f(x), f(y))- Inherited from
- Ordering
- Source
- Ordering.scala
Creates an Ordering[T] whose compare function returns the
result of this Ordering's compare function, if it is non-zero,
or else the result of others compare function.
Creates an Ordering[T] whose compare function returns the
result of this Ordering's compare function, if it is non-zero,
or else the result of others compare function.
- Value Params
- other
an Ordering to use if this Ordering returns zero
- Example
case class Pair(a: Int, b: Int) val pairOrdering = Ordering.by[Pair, Int](_.a) .orElse(Ordering.by[Pair, Int](_.b))- Inherited from
- Ordering
- Source
- Ordering.scala
Given f, a function from T into S, creates an Ordering[T] whose compare function returns the result of this Ordering's compare function, if it is non-zero, or else a result equivalent to:
Given f, a function from T into S, creates an Ordering[T] whose compare function returns the result of this Ordering's compare function, if it is non-zero, or else a result equivalent to:
Ordering[S].compare(f(x), f(y))This function is equivalent to passing the result of Ordering.by(f)
to orElse.
- Example
case class Pair(a: Int, b: Int) val pairOrdering = Ordering.by[Pair, Int](_.a) .orElseBy[Int](_.b)- Inherited from
- Ordering
- Source
- Ordering.scala
Return the opposite ordering of this one.
Return the opposite ordering of this one.
Implementations overriding this method MUST override isReverseOf as well if they change the behavior at all (for example, caching does not require overriding it).
- Definition Classes
- Inherited from
- Ordering
- Source
- Ordering.scala
- Inherited from
- Comparator
- Inherited from
- Comparator
Returns whether a comparison between x and y is defined, and if so
the result of compare(x, y).
Returns whether a comparison between x and y is defined, and if so
the result of compare(x, y).
- Inherited from
- Ordering
- Source
- Ordering.scala
Implicits
Inherited implicits
This implicit method augments T with the comparison operators defined
in scala.math.Ordering.Ops.
This implicit method augments T with the comparison operators defined
in scala.math.Ordering.Ops.
- Inherited from
- Ordering
- Source
- Ordering.scala