scala.tools.nsc.typechecker

# Implicits

###
Related Doc: package typechecker

#### trait Implicits extends AnyRef

This trait provides methods to find various kinds of implicits.

Self Type
  Analyzer
Source
  Implicits.scala
Version

  1.0

Linear Supertypes
AnyRef, Any
Known Subclasses
Analyzer, Duplicator, Duplicators, Erasure, SpecializationDuplicator, TreeCheckers, erasure, treeChecker
Type Hierarchy
Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. Implicits
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

### Type Members

1. #### class ImplicitInfo extends AnyRef

   A class that records an available implicit

2. #### class ImplicitSearch extends Analyzer.Typer with Analyzer.ImplicitsContextErrors

   A class that sets up an implicit search.

   A class that sets up an implicit search. For more info, see comments for `inferImplicit`.

3. #### case class OpenImplicit(info: Analyzer.ImplicitInfo, pt: Global.Type, tree: Global.Tree) extends Product with Serializable

   A class which is used to track pending implicits to prevent infinite implicit searches.

4. #### class SearchResult extends AnyRef

   The result of an implicit search

### Value Members

1. #### final def !=(arg0: Any): Boolean

   Test two objects for inequality.

   Test two objects for inequality.

   returns

     `true` if !(this == that), false otherwise.

   Definition Classes
     AnyRef → Any

2. #### final def ##(): Int

   Equivalent to `x.hashCode` except for boxed numeric types and `null`.

   Equivalent to `x.hashCode` except for boxed numeric types and `null`. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For `null` returns a hashcode where `null.hashCode` throws a `NullPointerException`.

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any

3. #### def +(other: String): String

   Implicit information
     This member is added by an implicit conversion from Implicits to any2stringadd[Implicits] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

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

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

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

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   returns

     `true` if the receiver object is equivalent to the argument; `false` otherwise.

   Definition Classes
     AnyRef → Any

6. #### lazy val AmbiguousSearchFailure: Analyzer.SearchResult

7. #### lazy val DivergentSearchFailure: Analyzer.SearchResult

8. #### object Function1

   An extractor for unary function types arg => res

9. #### object HasMember

   An extractor for types of the form ? { name: ? }

10. #### object HasMethodMatching

    An extractor for types of the form ? { name: (? >: argtpe <: Any*)restp }

11. #### object ImplicitNotFoundMsg

12. #### val NoImplicitInfo: Analyzer.ImplicitInfo

    A sentinel indicating no implicit was found

13. #### lazy val SearchFailure: Analyzer.SearchResult

14. #### def allViewsFrom(tp: Global.Type, context: Analyzer.Context, tpars: List[Global.Symbol]): List[(Analyzer.SearchResult, List[Global.TypeConstraint])]

    Find all views from type `tp` (in which `tpars` are free)

    Find all views from type `tp` (in which `tpars` are free)

    Note that the trees in the search results in the returned list share the same type variables. Ignore their constr field! The list of type constraints returned along with each tree specifies the constraints that must be met by the corresponding type parameter in `tpars` (for the returned implicit view to be valid).

    tp

      from-type for the implicit conversion

    context

      search implicits here

    tpars

      symbols that should be considered free type variables (implicit search should not try to solve them, just track their constraints)

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

    Cast the receiver object to be of type `T0`.

    Cast the receiver object to be of type `T0`.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression `1.asInstanceOf[String]` will throw a `ClassCastException` at runtime, while the expression `List(1).asInstanceOf[List[String]]` will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown

      `ClassCastException` if the receiver object is not an instance of the erasure of type `T0`.

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

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the `clone` method is platform dependent.

    returns

      a copy of the receiver object.

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

      not specified by SLS as a member of AnyRef

17. #### def ensuring(cond: (Implicits) ⇒ Boolean, msg: ⇒ Any): Implicits

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

18. #### def ensuring(cond: (Implicits) ⇒ Boolean): Implicits

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

19. #### def ensuring(cond: Boolean, msg: ⇒ Any): Implicits

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

20. #### def ensuring(cond: Boolean): Implicits

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

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

    Tests whether the argument (`that`) is a reference to the receiver object (`this`).

    Tests whether the argument (`that`) is a reference to the receiver object (`this`).

    The `eq` method implements an equivalence relation on non-null instances of `AnyRef`, and has three additional properties:

    - It is consistent: for any non-null instances `x` and `y` of type `AnyRef`, multiple invocations of `x.eq(y)` consistently returns `true` or consistently returns `false`.
    - For any non-null instance `x` of type `AnyRef`, `x.eq(null)` and `null.eq(x)` returns `false`.
    - `null.eq(null)` returns `true`.

    When overriding the `equals` or `hashCode` methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (`o1 eq o2`), they should be equal to each other (`o1 == o2`) and they should hash to the same value (`o1.hashCode == o2.hashCode`).

    returns

      `true` if the argument is a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef

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

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to `eq`.

    See also `equals` in scala.Any.

    returns

      `true` if the receiver object is equivalent to the argument; `false` otherwise.

    Definition Classes
      AnyRef → Any

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

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the `finalize` method is invoked, as well as the interaction between `finalize` and non-local returns and exceptions, are all platform dependent.

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

      not specified by SLS as a member of AnyRef

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

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

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

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

      a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
      AnyRef → Any
    Note

      not specified by SLS as a member of AnyRef

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

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

      the hash code value for this object.

    Definition Classes
      AnyRef → Any

27. #### def inferImplicit(tree: Global.Tree, pt: Global.Type, isView: Boolean, context: Analyzer.Context, silent: Boolean, withMacrosDisabled: Boolean, pos: Global.Position, onError: (Global.Position, String) ⇒ Unit): Global.Tree

    A friendly wrapper over inferImplicit to be used in macro contexts and toolboxes.

28. #### def inferImplicit(tree: Global.Tree, pt: Global.Type, reportAmbiguous: Boolean, isView: Boolean, context: Analyzer.Context, saveAmbiguousDivergent: Boolean, pos: Global.Position): Analyzer.SearchResult

    Search for an implicit value.

    Search for an implicit value. See the comment on `result` at the end of class `ImplicitSearch` for more info how the search is conducted.

    tree

      The tree for which the implicit needs to be inserted. (the inference might instantiate some of the undetermined type parameters of that tree.

    pt

      The expected type of the implicit.

    reportAmbiguous

      Should ambiguous implicit errors be reported? False iff we search for a view to find out whether one type is coercible to another.

    isView

      We are looking for a view

    context

      The current context

    saveAmbiguousDivergent

      False if any divergent/ambiguous errors should be ignored after implicits search, true if they should be reported (used in further typechecking).

    pos

      Position that is should be used for tracing and error reporting (useful when we infer synthetic stuff and pass EmptyTree in the `tree` argument) If it's set NoPosition, then position-based services will use `tree.pos`

    returns

      A search result

29. #### def inferImplicit(tree: Global.Tree, pt: Global.Type, reportAmbiguous: Boolean, isView: Boolean, context: Analyzer.Context, saveAmbiguousDivergent: Boolean): Analyzer.SearchResult

30. #### def inferImplicit(tree: Global.Tree, pt: Global.Type, reportAmbiguous: Boolean, isView: Boolean, context: Analyzer.Context): Analyzer.SearchResult

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

    Test whether the dynamic type of the receiver object is `T0`.

    Test whether the dynamic type of the receiver object is `T0`.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression `1.isInstanceOf[String]` will return `false`, while the expression `List(1).isInstanceOf[List[String]]` will return `true`. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

      `true` if the receiver object is an instance of erasure of type `T0`; `false` otherwise.

    Definition Classes
      Any

32. #### def memberWildcardType(name: Global.Name, tp: Global.Type): Global.Type

    A constructor for types ?{ def/type name: tp }, used in infer view to member searches.

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

    Equivalent to `!(this eq that)`.

    Equivalent to `!(this eq that)`.

    returns

      `true` if the argument is not a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef

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

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

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

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

36. #### def resetImplicits(): Unit

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

    Definition Classes
      AnyRef

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

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

      a String representation of the object.

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

42. #### def →[B](y: B): (Implicits, B)

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

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Ungrouped