object Sub

Our subtyping can be described by a following diagram:

value kind        ref kind         special kind
|     \           |    \
|     |           |      \
prim  aggr        class  trait
|     |           |      /
|     |           |    /
|     |           null
|     |           /
|     |       /
|     |   /
nothing

Primitive and aggregate types don't participate in subtyping and they have to be explicitly boxed to become compatible with a reference type.

Reference types form a simple lattice with java.lang.Object at the top and null type at the bottom. Subtyping between traits and classes is based on linearization of the all transitive parents, similarly to scalac.

Nothing is the common bottom type between reference and value types. It represents computations that may never complete normally (either loops forever or throws an exception).

Linear Supertypes
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Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  7. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  8. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  9. final def getClass(): java.lang.Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  10. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  11. def is(info: ScopeInfo, ty: RefKind)(implicit linked: Result): Boolean
  12. def is(l: Type, r: Type)(implicit linked: Result): Boolean
  13. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  14. def lub(linfo: ScopeInfo, rinfo: ScopeInfo, boundInfo: Option[ScopeInfo])(implicit linked: Result): ScopeInfo
  15. def lub(lty: Type, rty: Type, bound: Option[Type])(implicit linked: Result): Type
  16. def lub(tys: Seq[Type], bound: Option[Type])(implicit linked: Result): Type
  17. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  18. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  19. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  20. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  21. def toString(): String
    Definition Classes
    AnyRef → Any
  22. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  23. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  24. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()

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