trait Identity[A] extends Associative[A]
The Identity
type class describes an associative binary operator for a
type A
that also has an identity element. Combining any value with the
identity element on either the left or the right must return the original
value unchanged. For example, zero is an identity element for integer
addition and the empty string is an identity element for string
concatenation.
Operators with an identity element are useful because the identity element provides a sensible default value when combining values of a type and no values exist.
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abstract
def
combine(l: ⇒ A, r: ⇒ A): A
- Definition Classes
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abstract
def
identity: A
The identity element.
Concrete Value Members
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final
def
!=(arg0: Any): Boolean
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final
def
##(): Int
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final
def
==(arg0: Any): Boolean
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final
def
asInstanceOf[T0]: T0
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def
clone(): AnyRef
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final
def
eq(arg0: AnyRef): Boolean
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def
equals(arg0: Any): Boolean
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def
finalize(): Unit
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final
def
getClass(): Class[_]
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def
hashCode(): Int
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final
def
intersperse(middle: A): Associative[A]
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final
def
isInstanceOf[T0]: Boolean
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def
multiplyOption(n: Int)(a: A): Option[A]
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final
def
ne(arg0: AnyRef): Boolean
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final
def
notify(): Unit
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final
def
notifyAll(): Unit
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final
def
repeat(a: A)(n: Int): A
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final
def
synchronized[T0](arg0: ⇒ T0): T0
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def
toString(): String
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final
def
wait(): Unit
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def
wait(arg0: Long, arg1: Int): Unit
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def
wait(arg0: Long): Unit
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