Packages

c

scala.reflect.macros

Attachments

abstract class Attachments extends AnyRef

EXPERIMENTAL

Attachments provide a way to associate custom metadata with symbols and trees.

Along with symbol and tpe, which represent core metadata of trees, each tree carries the attachments field that can store other metadata: compiler-defined (e.g. positions) or user-defined. Same story is true for symbols, which also have extensible metadata by the virtue of the same attachments field.

Typically attachments just store a scala.reflect.api.Position, but they can be extended to encompass arbitrary payloads. Payloads are stored in type-indexed slots, which can be read with get[T] and written with update[T] and remove[T].

This API doesn't have much use in the runtime reflection API (the scala.reflect.api package), but it might be of help for macro writers, providing a way to coordinate multiple macros operating on the same code. Therefore the attachments field is only declared in trees and symbols belonging to scala.reflect.macros.Universe.

Self Type
Attachments
Source
Attachments.scala
Linear Supertypes
AnyRef, Any
Known Subclasses
Position
Type Hierarchy
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. Attachments
  2. AnyRef
  3. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new Attachments()

Type Members

  1. abstract type Pos >: Null

    The position type of this attachment

Abstract Value Members

  1. abstract def all: Set[Any]

    The underlying payload with the guarantee that no two elements have the same type.

  2. abstract def isEmpty: Boolean
  3. abstract def pos: Pos

    The underlying position

  4. abstract def withPos(newPos: Pos): Attachments { type Pos = Attachments.this.Pos }

    Creates a copy of this attachment with the position replaced by newPos

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 Attachments toany2stringadd[Attachments] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (Attachments, B)
    Implicit
    This member is added by an implicit conversion from Attachments toArrowAssoc[Attachments] 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 addElement[T](attachment: T): Attachments { type Pos = Attachments.this.Pos }

    Creates a copy of this attachment with the given element added.

  7. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  8. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  9. def cloneAttachments: Attachments { type Pos = Attachments.this.Pos }
  10. def contains[T](implicit arg0: ClassTag[T]): Boolean

    Check underlying payload contains an instance of type T.

  11. final def containsElement(element: Any): Boolean

    Tests if the given element is attached.

  12. def ensuring(cond: (Attachments) => Boolean, msg: => Any): Attachments
    Implicit
    This member is added by an implicit conversion from Attachments toEnsuring[Attachments] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  13. def ensuring(cond: (Attachments) => Boolean): Attachments
    Implicit
    This member is added by an implicit conversion from Attachments toEnsuring[Attachments] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  14. def ensuring(cond: Boolean, msg: => Any): Attachments
    Implicit
    This member is added by an implicit conversion from Attachments toEnsuring[Attachments] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  15. def ensuring(cond: Boolean): Attachments
    Implicit
    This member is added by an implicit conversion from Attachments toEnsuring[Attachments] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  16. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  17. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  18. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  19. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from Attachments toStringFormat[Attachments] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  20. def get[T](implicit arg0: ClassTag[T]): Option[T]

    An underlying payload of the given class type T.

  21. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  22. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  23. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  24. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  25. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  26. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  27. def remove[T](implicit arg0: ClassTag[T]): Attachments { type Pos = Attachments.this.Pos }

    Creates a copy of this attachment with the payload of the given class type T removed.

  28. final def removeElement[T](attachment: T): Attachments { type Pos = Attachments.this.Pos }

    Creates a copy of this attachment with the given element removed.

  29. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  30. def toString(): String
    Definition Classes
    AnyRef → Any
  31. def update[T](attachment: T)(implicit arg0: ClassTag[T]): Attachments { type Pos = Attachments.this.Pos }

    Creates a copy of this attachment with the payload slot of T added/updated with the provided value.

    Creates a copy of this attachment with the payload slot of T added/updated with the provided value. Replaces an existing payload of the same type, if exists.

  32. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  33. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  34. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Deprecated Value Members

  1. def →[B](y: B): (Attachments, B)
    Implicit
    This member is added by an implicit conversion from Attachments toArrowAssoc[Attachments] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use -> instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd fromAttachments to any2stringadd[Attachments]

Inherited by implicit conversion StringFormat fromAttachments to StringFormat[Attachments]

Inherited by implicit conversion Ensuring fromAttachments to Ensuring[Attachments]

Inherited by implicit conversion ArrowAssoc fromAttachments to ArrowAssoc[Attachments]

Ungrouped