scala.reflect.api

# Exprs

#### 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 `Expr`s 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.

`Expr`s 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

Linear Supertypes
AnyRef, Any
Known Subclasses
JavaUniverse, Universe, Universe
Type Hierarchy Learn more about scaladoc diagrams
Ordering

1. Grouped
2. Alphabetic
3. By inheritance

Inherited

1. Exprs
2. AnyRef
3. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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1. Public
2. All

### Type Members

1. #### trait Expr[+T] extends Equals with Serializable

   Expr wraps an abstract syntax tree and tags it with its type.

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

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

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

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

   Definition Classes
     AnyRef → Any

6. #### object Expr extends Serializable

   Constructor/Extractor for Expr.

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

   Definition Classes
     Any

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

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

9. #### def ensuring(cond: (Exprs) ⇒ Boolean, msg: ⇒ Any): Exprs

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

10. #### def ensuring(cond: (Exprs) ⇒ Boolean): Exprs

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

11. #### def ensuring(cond: Boolean, msg: ⇒ Any): Exprs

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

12. #### def ensuring(cond: Boolean): Exprs

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

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef → Any

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

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

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

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

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      Any

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

28. #### def →[B](y: B): (Exprs, B)

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

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Expressions

### Ungrouped