scala

unchecked

class unchecked extends Annotation

An annotation to designate that the annotated entity should not be considered for additional compiler checks. Specific applications include annotating the subject of a match expression to suppress exhaustiveness warnings, and annotating a type argument in a match case to suppress unchecked warnings.

Such suppression should be used with caution, without which one may encounter scala.MatchError or java.lang.ClassCastException at runtime. In most cases one can and should address the warning instead of suppressing it.

object Test extends App {
// This would normally warn "match is not exhaustive"
// because `None` is not covered.
def f(x: Option[String]) = (x: @unchecked) match { case Some(y) => y }
// This would normally warn "type pattern is unchecked"
// but here will blindly cast the head element to String.
def g(xs: Any) = xs match { case x: List[String @unchecked] => x.head }
}
Source
unchecked.scala
Since

2.4

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Inherited
  1. unchecked
  2. Annotation
  3. AnyRef
  4. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
  1. Public
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Instance Constructors

  1. new unchecked()

Value Members

  1. final def !=(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

    Definition Classes
    AnyRef → Any

  3. def +(other: String): String

    Implicit information
    This member is added by an implicit conversion from unchecked to any2stringadd[unchecked] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd

  4. def ->[B](y: B): (unchecked, B)

    Implicit information
    This member is added by an implicit conversion from unchecked to ArrowAssoc[unchecked] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()

  5. final def ==(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  6. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  7. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  8. def ensuring(cond: (unchecked) ⇒ Boolean, msg: ⇒ Any): unchecked

    Implicit information
    This member is added by an implicit conversion from unchecked to Ensuring[unchecked] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  9. def ensuring(cond: (unchecked) ⇒ Boolean): unchecked

    Implicit information
    This member is added by an implicit conversion from unchecked to Ensuring[unchecked] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  10. def ensuring(cond: Boolean, msg: ⇒ Any): unchecked

    Implicit information
    This member is added by an implicit conversion from unchecked to Ensuring[unchecked] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  11. def ensuring(cond: Boolean): unchecked

    Implicit information
    This member is added by an implicit conversion from unchecked to Ensuring[unchecked] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  12. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  13. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  14. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )

  15. def formatted(fmtstr: String): String

    Returns string formatted according to given format string.

    Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

    Implicit information
    This member is added by an implicit conversion from unchecked to StringFormat[unchecked] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()

  16. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any

  17. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  18. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  19. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  20. final def notify(): Unit

    Definition Classes
    AnyRef

  21. final def notifyAll(): Unit

    Definition Classes
    AnyRef

  22. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef

  23. def toString(): String

    Definition Classes
    AnyRef → Any

  24. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  25. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  26. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  27. def →[B](y: B): (unchecked, B)

    Implicit information
    This member is added by an implicit conversion from unchecked to ArrowAssoc[unchecked] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from Annotation

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from unchecked to any2stringadd[unchecked]

Inherited by implicit conversion StringFormat from unchecked to StringFormat[unchecked]

Inherited by implicit conversion Ensuring from unchecked to Ensuring[unchecked]

Inherited by implicit conversion ArrowAssoc from unchecked to ArrowAssoc[unchecked]

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