scala.reflect.api.Exprs

# Expr

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

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.

Linear Supertypes
Serializable, java.io.Serializable, Equals, AnyRef, Any
Type Hierarchy Learn more about scaladoc diagrams
Ordering

1. Alphabetic
2. By inheritance

Inherited

1. Expr
2. Serializable
3. Serializable
4. Equals
5. AnyRef
6. Any

Implicitly

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

1. Hide All
2. Show all

Learn more about member selection
Visibility

1. Public
2. All

### Abstract Value Members

1. #### abstract def actualType: Universe.Type

   Type of the wrapped expression tree as found in the underlying tree.

2. #### abstract def in[U <: Universe with Singleton](otherMirror: Mirror[U]): in.U.Expr[T]

   Migrates the expression into another mirror, jumping into a different universe if necessary.

3. #### abstract val mirror: Universe.Mirror

   Underlying mirror of this expr.

4. #### abstract def splice: T

   A dummy method to mark expression splicing in reification.

   A dummy method to mark expression splicing in reification.

   It should only be used within a `reify` call, which eliminates the `splice` call and embeds the wrapped tree into the reified surrounding expression. If used alone `splice` throws an exception when called at runtime.

   If you want to use an Expr in reification of some Scala code, you need to splice it in. For an expr of type `Expr[T]`, where `T` has a method `foo`, the following code

       reify{ expr.splice.foo }

   uses splice to turn an expr of type Expr[T] into a value of type T in the context of `reify`.

   It is equivalent to

       Select( expr.tree, newTermName("foo") )

   The following example code however does not compile

       reify{ expr.foo }

   because expr of type Expr[T] itself does not have a method foo.

   Annotations
     @compileTimeOnly( ... )

5. #### abstract def staticType: Universe.Type

   Type of the wrapped expression tree as provided during creation.

   Type of the wrapped expression tree as provided during creation.

   When exprs are created by the compiler, `staticType` represents a statically known type of the tree as calculated at that point by the compiler.

6. #### abstract def tree: Universe.Tree

   The Scala abstract syntax tree representing the wrapped expression.

7. #### abstract val value: T

   A dummy value to denote cross-stage path-dependent type dependencies.

   A dummy value to denote cross-stage path-dependent type dependencies.

   For example for the following macro definition:

       class X { type T }
       object Macros { def foo(x: X): x.T = macro Impls.foo_impl }

   The corresponding macro implementation should have the following signature (note how the return type denotes path-dependency on x):

       object Impls { def foo_impl(c: Context)(x: c.Expr[X]): c.Expr[x.value.T] = ... }

   Annotations
     @compileTimeOnly( ... )

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

4. #### def ->[B](y: B): (Universe.Expr[T], B)

   Implicit information
     This member is added by an implicit conversion from Universe.Expr[T] to ArrowAssoc[Universe.Expr[T]] 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 asInstanceOf[T0]: T0

   Definition Classes
     Any

7. #### def canEqual(x: Any): Boolean

   Definition Classes
     Expr → Equals

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

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

9. #### def ensuring(cond: (Universe.Expr[T]) ⇒ Boolean, msg: ⇒ Any): Universe.Expr[T]

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

10. #### def ensuring(cond: (Universe.Expr[T]) ⇒ Boolean): Universe.Expr[T]

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

11. #### def ensuring(cond: Boolean, msg: ⇒ Any): Universe.Expr[T]

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

12. #### def ensuring(cond: Boolean): Universe.Expr[T]

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

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

    Definition Classes
      AnyRef

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

    Definition Classes
      Expr → Equals → 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 Universe.Expr[T] to StringFormat[Universe.Expr[T]] 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
      Expr → 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
      Expr → 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): (Universe.Expr[T], B)

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

### Inherited from Serializable

### Inherited from java.io.Serializable

### Inherited from Equals

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from Universe.Expr[T] to any2stringadd[Universe.Expr[T]]

### Inherited by implicit conversion StringFormat from Universe.Expr[T] to StringFormat[Universe.Expr[T]]

### Inherited by implicit conversion Ensuring from Universe.Expr[T] to Ensuring[Universe.Expr[T]]

### Inherited by implicit conversion ArrowAssoc from Universe.Expr[T] to ArrowAssoc[Universe.Expr[T]]

### Ungrouped