trait Optional[A] extends Serializable
Type class that represents data types that have an "empty" value.
The purpose of this type class is to allow automatic derivation of Decoder for decoded types that might not
have a value - Option, List...
In theory, there should rarely be a need to interact directly with this type class, and one is usually better
served by obtaining the Decoder instance for Option and mapping on it.
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Abstract Value Members
- abstract def empty: A
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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- def isEmpty(a: A): Boolean
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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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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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final
def
wait(arg0: Long): Unit
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