Scala Reflection Library2.12.16 < Back

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package root

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root
package scala

Definition Classes
root
package reflect

Definition Classes
scala
package api
EXPERIMENTAL
EXPERIMENTAL
The Scala Reflection API (located in scala-reflect.jar).
In Scala 2.10.0, the Scala Reflection API and its implementation have an "experimental" status. This means that the API and the docs are not complete and can be changed in binary- and source-incompatible manner in 2.10.1. This also means that the implementation has some known issues.
The following types are the backbone of the Scala Reflection API, and serve as a good starting point for information about Scala Reflection:
For more information about Scala Reflection, see the Reflection Guide
Definition Classes
reflect
trait Exprs extends AnyRef
EXPERIMENTAL
EXPERIMENTAL
A trait that defines strongly-typed tree wrappers and operations on them for use in Scala Reflection.
Expr wraps an abstract syntax tree (scala.reflect.api.Trees#Tree) and tags it with its type (scala.reflect.api.Types#Type).
Usually Exprs are created via scala.reflect.api.Universe#reify, in which case a compiler produces a scala.reflect.api.TreeCreator for the provided expression and also creates a complementary scala.reflect.api.TypeTags#WeakTypeTag that corresponds to the type of that expression.
Exprs can also be created manually via the Expr companion object, but then the burden of providing a TreeCreator lies on the programmer. Compile-time reflection via macros, as described in scala.reflect.macros.Aliases, provides an easier way to instantiate exprs manually. Manual creation, however, is very rarely needed when working with runtime reflection.
Expr can be migrated from one mirror to another by using the in method. Migration means that all symbolic references to classes/objects/packages in the expression are re-resolved within the new mirror (typically using that mirror's classloader). The default universe of an Expr is typically scala.reflect.runtime#universe, the default mirror is typically scala.reflect.runtime#currentMirror.

Definition Classes
api
Expr

scala.reflect.api.Exprs

Expr

Companion trait Expr

object Expr extends Serializable

Constructor/Extractor for Expr.

Can be useful, when having a tree and wanting to splice it in reify call, in which case the tree first needs to be wrapped in an expr.

The main source of information about exprs is the scala.reflect.api.Exprs page.

Source: Exprs.scala

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Serializable, java.io.Serializable, AnyRef, Any

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final def !=(arg0: Any): Boolean

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final def ##(): Int

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final def ==(arg0: Any): Boolean

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def apply[T](mirror: Mirror[Exprs.this.type], treec: TreeCreator)(implicit arg0: Universe.WeakTypeTag[T]): Universe.Expr[T]
final def asInstanceOf[T0]: T0

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def clone(): AnyRef

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final def eq(arg0: AnyRef): Boolean

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final def synchronized[T0](arg0: ⇒ T0): T0

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def toString(): String

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def unapply[T](expr: Universe.Expr[T]): Option[Universe.Tree]
final def wait(): Unit

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Packages

Expr

Companion trait Expr

object Expr extends Serializable

Value Members

Inherited from Serializable

Inherited from java.io.Serializable

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Expr 

Companion trait Expr

object Expr extends Serializable

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Inherited from Serializable

Inherited from java.io.Serializable

Inherited from AnyRef

Inherited from Any

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Expr