Class scala.reflect.macros.Attachments
abstract class Attachments extends AnyRef
Instance Constructors
new Attachments()
Type Members
abstract type Pos >: Null
Abstract Value Members
abstract def pos: Pos
abstract def withPos(newPos: Pos): Attachments { type Pos = Attachments.this.Pos }
Concrete Value Members
final def !=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
final def ##(): Int
- Definition Classes
- AnyRef → Any
def +(other: String): String
- Implicit
- This member is added by an implicit conversion from Attachments to any2stringadd[Attachments] performed by method any2stringadd in scala.Predef.
- Definition Classes
- any2stringadd
def ->[B](y: B): (Attachments, B)
- Implicit
- This member is added by an implicit conversion from Attachments to ArrowAssoc[Attachments] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
- Annotations
- @inline()
final def ==(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
def all: Set[Any]
final def asInstanceOf[T0]: T0
- Definition Classes
- Any
def clone(): AnyRef
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( ... ) @native()
def contains[T](implicit arg0: ClassTag[T]): Boolean
def ensuring(cond: (Attachments) ⇒ Boolean, msg: ⇒ Any): Attachments
- Implicit
- This member is added by an implicit conversion from Attachments to Ensuring[Attachments] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
def ensuring(cond: (Attachments) ⇒ Boolean): Attachments
- Implicit
- This member is added by an implicit conversion from Attachments to Ensuring[Attachments] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
def ensuring(cond: Boolean, msg: ⇒ Any): Attachments
- Implicit
- This member is added by an implicit conversion from Attachments to Ensuring[Attachments] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
def ensuring(cond: Boolean): Attachments
- Implicit
- This member is added by an implicit conversion from Attachments to Ensuring[Attachments] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
final def eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
def equals(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
def finalize(): Unit
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( classOf[java.lang.Throwable] )
def formatted(fmtstr: String): String
- Implicit
- This member is added by an implicit conversion from Attachments to StringFormat[Attachments] performed by method StringFormat in scala.Predef.
- Definition Classes
- StringFormat
- Annotations
- @inline()
def get[T](implicit arg0: ClassTag[T]): Option[T]
final def getClass(): Class[_]
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
def hashCode(): Int
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
def isEmpty: Boolean
final def isInstanceOf[T0]: Boolean
- Definition Classes
- Any
final def ne(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
final def notify(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
final def notifyAll(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
def remove[T](implicit arg0: ClassTag[T]): Attachments { type Pos = Attachments.this.Pos }
final def synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
def toString(): String
- Definition Classes
- AnyRef → Any
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. Replaces an existing payload of the same type, if exists.
final def wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
final def wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... ) @native()
def →[B](y: B): (Attachments, B)
- Implicit
- This member is added by an implicit conversion from Attachments to ArrowAssoc[Attachments] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
© 2002-2019 EPFL, with contributions from Lightbend.
Licensed under the Apache License, Version 2.0.
https://www.scala-lang.org/api/2.12.9/scala-reflect/scala/reflect/macros/Attachments.html
EXPERIMENTAL
Attachments provide a way to associate custom metadata with symbols and trees.
Along with
symbolandtpe, which represent core metadata of trees, each tree carries theattachmentsfield 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 sameattachmentsfield.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 withupdate[T]andremove[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
attachmentsfield is only declared in trees and symbols belonging to scala.reflect.macros.Universe.