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object union

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  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  8. def finalize(): Unit
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  9. final def getClass(): Class[_]
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  11. final def isInstanceOf[T0]: Boolean
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  12. final def ne(arg0: AnyRef): Boolean
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  15. final def synchronized[T0](arg0: ⇒ T0): T0
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  16. def toString(): String
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  17. implicit def unionOps[C <: Coproduct](u: C): UnionOps[C]
  18. final def wait(): Unit
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  19. final def wait(arg0: Long, arg1: Int): Unit
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  20. final def wait(arg0: Long): Unit
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  21. object Union extends Dynamic

    Discriminated unions encoded as Coproducts of their value types intersected with the singleton types of their keys.

    Discriminated unions encoded as Coproducts of their value types intersected with the singleton types of their keys.

    Union types may be written using a relatively concise syntax thanks to a trick due to Denys Shabalin (@den_sh) and Eugene Burmako (@xeno_by). We use a combination of selectDynamic and backticks to embed a type in a path which appears to the compiler as stable,

    type Xyz = Union.`'x -> Int, 'y -> String, 'z -> Boolean`.T

    The use of singleton-typed Symbols as keys would make this type extremely laborious to write out by hand.

    There is also a mechanism for creating values of union types using Scala's named argument syntax. Values of the type just defined can be created as follows,

    val y = Union[Xyz](y = "foo")
y.get('y) // == Some("foo")

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