trait Semigroup[T] extends algebra.Semigroup[T] with AdditiveSemigroup[T]
A semigroup is any type T
with an associative operation (plus
):
a plus (b plus c) = (a plus b) plus c
Example instances:
Semigroup[Int]
:plus
Int#+
Semigroup[List[T]]
:plus
isList#++
- Annotations
- @implicitNotFound()
Linear Supertypes
Known Subclasses
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Inherited
- Semigroup
- AdditiveSemigroup
- Semigroup
- Serializable
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Visibility
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Abstract Value Members
- abstract def plus(x: T, y: T): T
- Definition Classes
- AdditiveSemigroup
Concrete Value Members
- final def !=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
- final def ##: Int
- Definition Classes
- AnyRef → Any
- final def ==(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
- def additive: algebra.Semigroup[T]
- Definition Classes
- Semigroup → AdditiveSemigroup
- final def asInstanceOf[T0]: T0
- Definition Classes
- Any
- def clone(): AnyRef
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- def combine(l: T, r: T): T
- Definition Classes
- Semigroup → Semigroup
- def combineAllOption(iter: TraversableOnce[T]): Option[T]
- Definition Classes
- Semigroup → Semigroup
- def combineN(a: T, n: Int): T
- Definition Classes
- Semigroup
- final def eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- def equals(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef → Any
- def finalize(): Unit
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.Throwable])
- final def getClass(): Class[_ <: AnyRef]
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
- def hashCode(): Int
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
- final def isInstanceOf[T0]: Boolean
- Definition Classes
- Any
- final def ne(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- final def notify(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
- final def notifyAll(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
- def positiveSumN(a: T, n: Int): T
- Attributes
- protected[this]
- Definition Classes
- AdditiveSemigroup
- def repeatedCombineN(a: T, n: Int): T
- Attributes
- protected[this]
- Definition Classes
- Semigroup
- def sumN(a: T, n: Int): T
- Definition Classes
- AdditiveSemigroup
- def sumOption(iter: TraversableOnce[T]): Option[T]
Returns an instance of
T
calculated by summing all instances initer
in one pass.Returns an instance of
T
calculated by summing all instances initer
in one pass. ReturnsNone
ifiter
is empty, elseSome[ T]
.- iter
instances of
T
to be combined- returns
None
ifiter
is empty, else an option value containing the summedT
- Note
Override if there is a faster way to compute this sum than
iter.reduceLeftOption
using plus.
- final def synchronized[T0](arg0: => T0): T0
- Definition Classes
- AnyRef
- def toString(): String
- Definition Classes
- AnyRef → Any
- def trySum(iter: TraversableOnce[T]): Option[T]
- Definition Classes
- Semigroup → AdditiveSemigroup
- final def wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException]) @native()