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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
TypedSubstitution, MatchAnalyzer, MatchApproximator, CodegenCore, OptimizedCodegen, PureCodegen, PureMatchMonadInterface, CommonSubconditionElimination, MatchOptimizer, SwitchEmission, MatchTranslator, TreeMakers, OptimizingMatchTranslator, PureMatchTranslator
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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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Visibility
  1. Public
  2. All

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
    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
    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[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  8. def ensuring(cond: (MatchMonadInterface) ⇒ Boolean, msg: ⇒ Any): MatchMonadInterface
    Implicit
    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
    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
    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
    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[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  15. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  16. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  17. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  18. val matchOwner: Global.Symbol
  19. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  20. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  21. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  22. def pureType(tp: Global.Type): Global.Type
  23. def reportMissingCases(pos: Global.Position, counterExamples: List[String]): Unit
  24. def reportUnreachable(pos: Global.Position): Unit
  25. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  26. def toString(): String
    Definition Classes
    AnyRef → Any
  27. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  28. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  29. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  30. def →[B](y: B): (MatchMonadInterface, B)
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to ArrowAssoc[MatchMonadInterface] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Deprecated Value Members

  1. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to StringFormat[MatchMonadInterface] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.12.16) Use formatString.format(value) instead of value.formatted(formatString), or use the f"" string interpolator. In Java 15 and later, formatted resolves to the new method in String which has reversed parameters.

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