TotalOrdering

trait TotalOrdering extends Ordering[Double]

An ordering for Doubles which is a fully consistent total ordering, and treats NaN as larger than all other Double values; it behaves the same as java.lang.Double.compare.

An ordering for Doubles which is a fully consistent total ordering, and treats NaN as larger than all other Double values; it behaves the same as java.lang.Double.compare.

Because the behavior of Doubles specified by IEEE is not consistent with a total ordering when dealing with NaN, there are two orderings defined for Double: TotalOrdering, which is consistent with a total ordering, and IeeeOrdering, which is consistent as much as possible with IEEE spec and floating point operations defined in scala.math.

This ordering may be preferable for sorting collections.

See also
Companion
object
trait Equiv[Double]
class Object
trait Matchable
class Any

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.

Inherited from
Ordering

Value members

Concrete methods

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

Inherited methods

override def equiv(x: Double, y: Double): Boolean

Return true if x == y in the ordering.

Return true if x == y in the ordering.

Definition Classes
Inherited from
Ordering
override def gt(x: Double, y: Double): Boolean

Return true if x > y in the ordering.

Return true if x > y in the ordering.

Definition Classes
Inherited from
Ordering
override def gteq(x: Double, y: Double): Boolean

Return true if x >= y in the ordering.

Return true if x >= y in the ordering.

Definition Classes
Inherited from
Ordering
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.

Inherited from
Ordering
override def lt(x: Double, y: Double): Boolean

Return true if x < y in the ordering.

Return true if x < y in the ordering.

Definition Classes
Inherited from
Ordering
override def lteq(x: Double, y: Double): Boolean

Return true if x <= y in the ordering.

Return true if x <= y in the ordering.

Definition Classes
Inherited from
Ordering
def max[U <: Double](x: U, y: U): U

Return x if x >= y, otherwise y.

Return x if x >= y, otherwise y.

Inherited from
Ordering
def min[U <: Double](x: U, y: U): U

Return x if x <= y, otherwise y.

Return x if x <= y, otherwise y.

Inherited from
Ordering
def on[U](f: U => Double): 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))
Inherited from
Ordering

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

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
override def reverse: Ordering[Double]

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
Inherited from
Comparator
def thenComparing[U <: Comparable[_ >: U <: `<FromJavaObject>`]](`x$0`: Function[_ >: T <: `<FromJavaObject>`, _ <: U]): Comparator[Double]
Inherited from
Comparator
def thenComparing[U <: `<FromJavaObject>`](`x$0`: Function[_ >: T <: `<FromJavaObject>`, _ <: U], `x$1`: Comparator[_ >: U <: `<FromJavaObject>`]): Comparator[Double]
Inherited from
Comparator
def thenComparing(`x$0`: Comparator[_ >: T <: `<FromJavaObject>`]): Comparator[Double]
Inherited from
Comparator
def thenComparingDouble(`x$0`: ToDoubleFunction[_ >: T <: `<FromJavaObject>`]): Comparator[Double]
Inherited from
Comparator
def thenComparingInt(`x$0`: ToIntFunction[_ >: T <: `<FromJavaObject>`]): Comparator[Double]
Inherited from
Comparator
def thenComparingLong(`x$0`: ToLongFunction[_ >: T <: `<FromJavaObject>`]): Comparator[Double]
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

Implicits

Inherited implicits

implicit def mkOrderingOps(lhs: Double): 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