sealed trait Eff[R, A] extends AnyRef

Effects of type R, returning a value of type A

It is implemented as a "Free-er" monad with extensible effects:

  • the "pure" case is a pure value of type A
  • the "impure" case is:
    • a disjoint union of possible effects
    • a continuation of type X => Eff[R, A] indicating what to do if the current effect is of type M[X] this type is represented by the Arrs type

The monad implementation for this type is really simple:

  • point is Pure
  • bind simply appends the binding function to the Arrs continuation

Important:

The list of continuations is NOT implemented as a type sequence but simply as a Vector[Any => Eff[R, Any]]

This means that various .asInstanceOf are present in the implementation and could lead to burns and severe harm. Use with caution!

See also

http://okmij.org/ftp/Haskell/extensible/more.pdf

Linear Supertypes
AnyRef, Any
Known Subclasses
Impure, Pure
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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[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  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[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  9. def flatMap[B](f: (A) ⇒ Eff[R, B]): Eff[R, B]
  10. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  11. def hashCode(): Int
    Definition Classes
    AnyRef → Any
  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  13. def map[B](f: (A) ⇒ B): Eff[R, B]
  14. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  15. final def notify(): Unit
    Definition Classes
    AnyRef
  16. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  17. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  18. def toString(): String
    Definition Classes
    AnyRef → Any
  19. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  20. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  21. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

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