trait Exprs extends AnyRef
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.
- Self Type
- Universe
- Source
- Exprs.scala
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Type Members
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trait
Expr[+T] extends Equals with Serializable
Expr wraps an abstract syntax tree and tags it with its type.
Expr wraps an abstract syntax tree and tags it with its type. The main source of information about exprs is the scala.reflect.api.Exprs page.
Value Members
-
final
def
!=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
final
def
##(): Int
- Definition Classes
- AnyRef → Any
- def +(other: String): String
- def ->[B](y: B): (Exprs, B)
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final
def
==(arg0: Any): Boolean
- Definition Classes
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final
def
asInstanceOf[T0]: T0
- Definition Classes
- Any
-
def
clone(): AnyRef
- Attributes
- protected[java.lang]
- Definition Classes
- AnyRef
- Annotations
- @native() @throws( ... )
- def ensuring(cond: (Exprs) ⇒ Boolean, msg: ⇒ Any): Exprs
- def ensuring(cond: (Exprs) ⇒ Boolean): Exprs
- def ensuring(cond: Boolean, msg: ⇒ Any): Exprs
- def ensuring(cond: Boolean): Exprs
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final
def
eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
-
def
equals(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
def
finalize(): Unit
- Attributes
- protected[java.lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( classOf[java.lang.Throwable] )
- def formatted(fmtstr: String): String
-
final
def
getClass(): Class[_]
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
-
def
hashCode(): Int
- Definition Classes
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- Annotations
- @native()
-
final
def
isInstanceOf[T0]: Boolean
- Definition Classes
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-
final
def
ne(arg0: AnyRef): Boolean
- Definition Classes
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final
def
notify(): Unit
- Definition Classes
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- @native()
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final
def
notifyAll(): Unit
- Definition Classes
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- @native()
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final
def
synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
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-
def
toString(): String
- Definition Classes
- AnyRef → Any
-
final
def
wait(): Unit
- Definition Classes
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- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long, arg1: Int): Unit
- Definition Classes
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- Annotations
- @throws( ... )
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final
def
wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @native() @throws( ... )
- def →[B](y: B): (Exprs, B)
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object
Expr extends Serializable
Constructor/Extractor for Expr.
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.