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
- 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
Concrete methods
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)
- Source:
- Ordering.scala
Inherited methods
Return true if x == y in the ordering.
Return true if x == y in the ordering.
- Definition Classes
- Inherited from:
- Ordering
- Source:
- Ordering.scala
Return true if x > y in the ordering.
Return true if x > y in the ordering.
- Definition Classes
- Inherited from:
- Ordering
- Source:
- Ordering.scala
Return true if x >= y in the ordering.
Return true if x >= y in the ordering.
- Definition Classes
- Inherited from:
- Ordering
- Source:
- Ordering.scala
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
Return true if x < y in the ordering.
Return true if x < y in the ordering.
- Definition Classes
- Inherited from:
- Ordering
- Source:
- Ordering.scala
Return true if x <= y in the ordering.
Return true if x <= y in the ordering.
- Definition Classes
- Inherited from:
- Ordering
- Source:
- Ordering.scala
Return x if x >= y, otherwise y.
Return x if x >= y, otherwise y.
- Inherited from:
- Ordering
- Source:
- Ordering.scala
Return x if x <= y, otherwise y.
Return x if x <= y, otherwise y.
- 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 parameters:
- 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