# CachedReverse

scala.math.Ordering\$.CachedReverse
sealed trait CachedReverse[T] extends Ordering[T]

An ordering which caches the value of its reverse.

## Attributes

Source
Ordering.scala
Graph
Supertypes
trait Ordering[T]
trait PartialOrdering[T]
trait Equiv[T]
trait Serializable
trait Comparator[T]
class Object
trait Matchable
class Any
Known subtypes
object Int.type

## Members list

### Type members

#### Inherited classlikes

class OrderingOps(lhs: T)

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.

## Attributes

Inherited from:
Ordering
Source
Ordering.scala
Supertypes
class Object
trait Matchable
class Any

### Value members

#### Concrete methods

final override def isReverseOf(other: Ordering[_]): Boolean

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.

## Attributes

Definition Classes
Source
Ordering.scala
final override def reverse: Ordering[T]

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).

## Attributes

Definition Classes
Source
Ordering.scala

#### Inherited methods

def compare(x: T, y: T): Int

Returns an integer whose sign communicates how x compares to y.

Returns an integer whose sign communicates how x compares to y.

The result sign has the following meaning:

- negative if x < y - positive if x > y - zero otherwise (if x == y)

## Attributes

Inherited from:
Ordering
Source
Ordering.scala
override def equiv(x: T, y: T): Boolean

Return true if `x` == `y` in the ordering.

Return true if `x` == `y` in the ordering.

## Attributes

Definition Classes
Inherited from:
Ordering
Source
Ordering.scala
override def gt(x: T, y: T): Boolean

Return true if `x` > `y` in the ordering.

Return true if `x` > `y` in the ordering.

## Attributes

Definition Classes
Inherited from:
Ordering
Source
Ordering.scala
override def gteq(x: T, y: T): Boolean

Return true if `x` >= `y` in the ordering.

Return true if `x` >= `y` in the ordering.

## Attributes

Definition Classes
Inherited from:
Ordering
Source
Ordering.scala
override def lt(x: T, y: T): Boolean

Return true if `x` < `y` in the ordering.

Return true if `x` < `y` in the ordering.

## Attributes

Definition Classes
Inherited from:
Ordering
Source
Ordering.scala
override def lteq(x: T, y: T): Boolean

Return true if `x` <= `y` in the ordering.

Return true if `x` <= `y` in the ordering.

## Attributes

Definition Classes
Inherited from:
Ordering
Source
Ordering.scala
def max[U <: T](x: U, y: U): U

Return `x` if `x` >= `y`, otherwise `y`.

Return `x` if `x` >= `y`, otherwise `y`.

## Attributes

Inherited from:
Ordering
Source
Ordering.scala
def min[U <: T](x: U, y: U): U

Return `x` if `x` <= `y`, otherwise `y`.

Return `x` if `x` <= `y`, otherwise `y`.

## Attributes

Inherited from:
Ordering
Source
Ordering.scala
def on[U](f: U => T): Ordering[U]

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))
``````

## Attributes

Inherited from:
Ordering
Source
Ordering.scala
def orElse(other: Ordering[T]): Ordering[T]

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 `other`s 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 `other`s compare function.

## Value parameters

other

an Ordering to use if this Ordering returns zero

## Attributes

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
def orElseBy[S](f: T => S)(implicit ord: Ordering[S]): Ordering[T]

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`.

## Attributes

Example

``````case class Pair(a: Int, b: Int)
val pairOrdering = Ordering.by[Pair, Int](_.a)
.orElseBy[Int](_.b)
``````
Inherited from:
Ordering
Source
Ordering.scala
def reversed(): Comparator[T]

## Attributes

Inherited from:
Comparator
def thenComparing[U <: Comparable[_ >: U <: <FromJavaObject>]](x\$0: Function[_ >: T <: <FromJavaObject>, _ <: U]): Comparator[T]

## Attributes

Inherited from:
Comparator
def thenComparing[U <: <FromJavaObject>](x\$0: Function[_ >: T <: <FromJavaObject>, _ <: U], x\$1: Comparator[_ >: U <: <FromJavaObject>]): Comparator[T]

## Attributes

Inherited from:
Comparator
def thenComparing(x\$0: Comparator[_ >: T <: <FromJavaObject>]): Comparator[T]

## Attributes

Inherited from:
Comparator
def thenComparingDouble(x\$0: ToDoubleFunction[_ >: T <: <FromJavaObject>]): Comparator[T]

## Attributes

Inherited from:
Comparator
def thenComparingInt(x\$0: ToIntFunction[_ >: T <: <FromJavaObject>]): Comparator[T]

## Attributes

Inherited from:
Comparator
def thenComparingLong(x\$0: ToLongFunction[_ >: T <: <FromJavaObject>]): Comparator[T]

## Attributes

Inherited from:
Comparator
def tryCompare(x: T, y: T): Option[Int]

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)`.

## Attributes

Inherited from:
Ordering
Source
Ordering.scala

### Implicits

#### Inherited implicits

implicit def mkOrderingOps(lhs: T): OrderingOps

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