scala.tools.nsc.transform.patmat

# MatchCodeGen

#### trait MatchCodeGen extends Interface

Factory methods used by TreeMakers to make the actual trees.

We have two modes in which to emit trees: optimized (the default) and pure (aka "virtualized": match is parametric in its monad).

Source
  MatchCodeGen.scala

Linear Supertypes
Interface, TreeDSL, AnyRef, Any
Known Subclasses
MatchAnalysis, MatchApproximation, MatchOptimization, MatchTreeMaking, PatternMatching, patmat
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Inherited

1. MatchCodeGen
2. Interface
3. TreeDSL
4. AnyRef
5. Any

Implicitly

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

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### Type Members

1. #### trait CodegenCore extends MatchMonadInterface

2. #### 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:

   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))
       }

   Definition Classes
     Interface

3. #### trait OptimizedCodegen extends CodegenCore with TypedSubstitution with MatchMonadInterface

4. #### trait PureCodegen extends CodegenCore with PureMatchMonadInterface

5. #### trait PureMatchMonadInterface extends MatchMonadInterface

6. #### trait TypedSubstitution extends MatchMonadInterface

   Definition Classes
     Interface

### Abstract Value Members

1. #### abstract val global: Global

   Definition Classes
     TreeDSL

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

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

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

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

   Definition Classes
     AnyRef → Any

6. #### object CODE

   Definition Classes
     TreeDSL

7. #### final def asInstanceOf[T0]: T0

   Definition Classes
     Any

8. #### def clone(): AnyRef

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

9. #### final def dealiasWiden(tp: Global.Type): Global.Type

   Attributes
     protected
   Definition Classes
     Interface

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

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

11. #### def ensuring(cond: (MatchCodeGen) ⇒ Boolean): MatchCodeGen

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

12. #### def ensuring(cond: Boolean, msg: ⇒ Any): MatchCodeGen

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

13. #### def ensuring(cond: Boolean): MatchCodeGen

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

14. #### final def eq(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

15. #### def equals(arg0: Any): Boolean

    Definition Classes
      AnyRef → Any

16. #### def finalize(): Unit

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

17. #### def formatted(fmtstr: String): String

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

18. #### final def getClass(): Class[_]

    Definition Classes
      AnyRef → Any

19. #### final def hasStableSymbol(p: Global.Tree): Boolean

    Attributes
      protected
    Definition Classes
      Interface

20. #### def hashCode(): Int

    Definition Classes
      AnyRef → Any

21. #### final def isInstanceOf[T0]: Boolean

    Definition Classes
      Any

22. #### final def mkFALSE: Global.Literal

    Attributes
      protected
    Definition Classes
      Interface

23. #### final def mkTRUE: Global.Literal

    Attributes
      protected
    Definition Classes
      Interface

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef → Any

29. #### object vpmName

    Definition Classes
      Interface

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

33. #### def →[B](y: B): (MatchCodeGen, B)

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

### Inherited from Interface

### Inherited from TreeDSL

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Ungrouped