scala.tools.nsc.transform.patmat.Interface

# MatchMonadInterface

#### trait MatchMonadInterface extends AnyRef

Interface with user-defined match monad? if there's a `__match` in scope, we use this as the match strategy, assuming it conforms to MatchStrategy as defined below:

    type Matcher[P[_], M[+_], A] = {
      def flatMap[B](f: P[A] => M[B]): M[B]
      def orElse[B >: A](alternative: => M[B]): M[B]
    }

    abstract class MatchStrategy[P[_], M[+_]] {
      // runs the matcher on the given input
      def runOrElse[T, U](in: P[T])(matcher: P[T] => M[U]): P[U]

      def zero: M[Nothing]
      def one[T](x: P[T]): M[T]
      def guard[T](cond: P[Boolean], then: => P[T]): M[T]
    }

P and M are derived from one's signature (`def one[T](x: P[T]): M[T]`)

if no `__match` is found, we assume the following implementation (and generate optimized code accordingly)

    object __match extends MatchStrategy[({type Id[x] = x})#Id, Option] {
    def zero = None
    def one[T](x: T) = Some(x)
    // NOTE: guard's return type must be of the shape M[T], where M is the monad in which the pattern match should be interpreted
    def guard[T](cond: Boolean, then: => T): Option[T] = if(cond) Some(then) else None
    def runOrElse[T, U](x: T)(f: T => Option[U]): U = f(x) getOrElse (throw new MatchError(x))
    }

Source
  PatternMatching.scala

Linear Supertypes
AnyRef, Any
Known Subclasses
CodegenCore, CommonSubconditionElimination, MatchAnalyzer, MatchApproximator, MatchOptimizer, MatchTranslator, OptimizedCodegen, OptimizingMatchTranslator, PureCodegen, PureMatchMonadInterface, PureMatchTranslator, SwitchEmission, TreeMakers, TypedSubstitution
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Inherited

1. MatchMonadInterface
2. AnyRef
3. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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### Abstract Value Members

1. #### abstract val typer: (analyzer)#Typer

### Concrete 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 MatchMonadInterface to any2stringadd[MatchMonadInterface] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

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

   Implicit information
     This member is added by an implicit conversion from MatchMonadInterface to ArrowAssoc[MatchMonadInterface] 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: (MatchMonadInterface) ⇒ Boolean, msg: ⇒ Any): MatchMonadInterface

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

9. #### def ensuring(cond: (MatchMonadInterface) ⇒ Boolean): MatchMonadInterface

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

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

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

11. #### def ensuring(cond: Boolean): MatchMonadInterface

    Implicit information
      This member is added by an implicit conversion from MatchMonadInterface to Ensuring[MatchMonadInterface] 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

    Implicit information
      This member is added by an implicit conversion from MatchMonadInterface to StringFormat[MatchMonadInterface] 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. #### val matchOwner: Global.Symbol

20. #### final def ne(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

21. #### final def notify(): Unit

    Definition Classes
      AnyRef

22. #### final def notifyAll(): Unit

    Definition Classes
      AnyRef

23. #### def pureType(tp: Global.Type): Global.Type

24. #### def reportMissingCases(pos: Global.Position, counterExamples: List[String]): Unit

25. #### def reportUnreachable(pos: Global.Position): Unit

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

    Definition Classes
      AnyRef

27. #### def toString(): String

    Definition Classes
      AnyRef → Any

28. #### final def wait(): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

30. #### final def wait(arg0: Long): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

31. #### def →[B](y: B): (MatchMonadInterface, B)

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

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from MatchMonadInterface to any2stringadd[MatchMonadInterface]

### Inherited by implicit conversion StringFormat from MatchMonadInterface to StringFormat[MatchMonadInterface]

### Inherited by implicit conversion Ensuring from MatchMonadInterface to Ensuring[MatchMonadInterface]

### Inherited by implicit conversion ArrowAssoc from MatchMonadInterface to ArrowAssoc[MatchMonadInterface]

### Ungrouped