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com.datastax.spark.connector.util

MagicalTypeTricks

object MagicalTypeTricks

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Type Members

  1. trait DoesntHaveImplicit[A, B] extends AnyRef
  2. trait IsNotEqualTo[A, B] extends AnyRef
  3. trait IsNotSubclassOf[A, B] extends AnyRef
  4. type ¬[A] = (A) ⇒ Nothing
  5. type λ[A] = (¬[A]) ⇒ Nothing
  6. type ∪[T, U] = (¬[T] with ¬[U]) ⇒ Nothing

    Example of how disjunction can be used:

    Example of how disjunction can be used:

    import com.datastax.spark.connector.util.MagicalTypeTricks._

def function[T](t: T)(implicit ev: (λ[T] <:< (Int ∪ String))) = {
  println("t = " + t)
}

function(5)      // t = 5
function("five") // t = five
function(5d)     // error: Cannot prove that
                 // (Double => Nothing) => Nothing <:< Int => Nothing with String => Nothing => Nothing.

    Based on this article.

Value Members

  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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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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    @throws( ... ) @native() @HotSpotIntrinsicCandidate()
  6. implicit def doesntHaveImplicit[A, B]: DoesntHaveImplicit[A, B]
  7. implicit def doesntHaveImplicitAmbiguity1[A, B](implicit ev: B): DoesntHaveImplicit[A, B]
  8. implicit def doesntHaveImplicitAmbiguity2[A, B](implicit ev: B): DoesntHaveImplicit[A, B]
  9. final def eq(arg0: AnyRef): Boolean
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  10. def equals(arg0: Any): Boolean
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  11. final def getClass(): Class[_]
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  12. def hashCode(): Int
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  13. final def isInstanceOf[T0]: Boolean
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  14. final def ne(arg0: AnyRef): Boolean
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  15. implicit def neq[A, B]: IsNotEqualTo[A, B]
  16. implicit def neqAmbiguity1[A]: IsNotEqualTo[A, A]
  17. implicit def neqAmbiguity2[A]: IsNotEqualTo[A, A]
  18. final def notify(): Unit
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    @native() @HotSpotIntrinsicCandidate()
  19. final def notifyAll(): Unit
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  20. implicit def nsub[A, B]: IsNotSubclassOf[A, B]
  21. implicit def nsubAmbiguity1[A, B >: A]: IsNotSubclassOf[A, B]
  22. implicit def nsubAmbiguity2[A, B >: A]: IsNotSubclassOf[A, B]
  23. final def synchronized[T0](arg0: ⇒ T0): T0
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  24. def toString(): String
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  25. final def wait(arg0: Long, arg1: Int): Unit
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  26. final def wait(arg0: Long): Unit
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  27. final def wait(): Unit
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  1. def finalize(): Unit
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    @throws( classOf[java.lang.Throwable] ) @Deprecated @deprecated
    Deprecated

    (Since version ) see corresponding Javadoc for more information.

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