sealed abstract class As[-A, +B] extends Serializable
As substitutability: A better <:<
This class exists to aid in the capture proof of subtyping relationships, which can be applied in other context to widen other type
A As B
holds whenever A
could be used in any negative context
that expects a B
. (e.g. if you could pass an A
into any
function that expects a B
as input.)
This code was ported directly from scalaz to cats using this version from scalaz: https://github.com/scalaz/scalaz/blob/a89b6d63/core/src/main/scala/scalaz/Liskov.scala
The original contribution to scalaz came from Jason Zaugg
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Abstract Value Members
- abstract def substitute[F[-_]](p: F[B]): F[A]
Use this subtyping relationship to replace B with a value of type A in a contravariant context.
Use this subtyping relationship to replace B with a value of type A in a contravariant context. This would commonly be the input to a function, such as F in:
type F[-B] = B => String
. In this case, we could use A As B to turn an F[B] Into F[A].
Concrete Value Members
- 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 andThen[C](that: As[B, C]): As[A, C]
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- @inline()
- final def asInstanceOf[T0]: T0
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- def clone(): AnyRef
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- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- final def coerce(a: A): B
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- @inline()
- final def compose[C](that: As[C, A]): As[C, B]
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- final def eq(arg0: AnyRef): Boolean
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- def equals(arg0: AnyRef): Boolean
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- def finalize(): Unit
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- final def getClass(): Class[_ <: AnyRef]
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- def hashCode(): Int
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- final def isInstanceOf[T0]: Boolean
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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 synchronized[T0](arg0: => T0): T0
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- final def toPredef: <:<[A, B]
A value
A As B
is always sufficient to produce a similarPredef.<:<
value.A value
A As B
is always sufficient to produce a similarPredef.<:<
value.- Annotations
- @inline()
- def toString(): String
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- final def wait(): Unit
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- final def wait(arg0: Long, arg1: Int): Unit
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