scala.reflect.macros

BlackboxMacro

trait BlackboxMacro extends AnyRef

EXPERIMENTAL

Traditionally macro implementations are defined as methods, but this trait provides an alternative way of encoding macro impls as bundles, traits which extend scala.reflect.macros.BlackboxMacro orscala.reflect.macros.WhiteboxMacro .

Instead of:

def impl[T: c.WeakTypeTag](c: BlackboxContext)(x: c.Expr[Int]) = ...

One can write:

trait Impl extends BlackboxMacro { def apply[T: c.WeakTypeTag](x: c.Expr[Int]) = ... }

Without changing anything else at all.

This language feature is useful in itself in cases when macro implementations are complex and need to be modularized. State of the art technique of addressing this need is quite heavyweight: http://docs.scala-lang.org/overviews/macros/overview.html#writing_bigger_macros.

See also

scala.reflect.macros.WhiteboxMacro

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  2. by StringFormat
  3. by Ensuring
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Abstract Value Members

  1. abstract val c: BlackboxContext

    The context to be used by the macro implementation.

    The context to be used by the macro implementation.

    Vanilla macro implementations have to carry it in their signatures, however when a macro is a full-fledged module, it can define the context next to the implementation, makes implementation signature more lightweight.

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any

  3. final def ##(): Int

    Definition Classes
    AnyRef → Any

  4. def +(other: String): String

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

  5. def ->[B](y: B): (BlackboxMacro, B)

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

  6. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  7. final def ==(arg0: Any): Boolean

    Definition Classes
    Any

  8. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  9. def clone(): AnyRef

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

  10. def ensuring(cond: (BlackboxMacro) ⇒ Boolean, msg: ⇒ Any): BlackboxMacro

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

  11. def ensuring(cond: (BlackboxMacro) ⇒ Boolean): BlackboxMacro

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

  12. def ensuring(cond: Boolean, msg: ⇒ Any): BlackboxMacro

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

  13. def ensuring(cond: Boolean): BlackboxMacro

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

  14. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  15. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  16. def finalize(): Unit

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

  17. def formatted(fmtstr: String): String

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

  18. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any

  19. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  20. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  21. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  22. final def notify(): Unit

    Definition Classes
    AnyRef

  23. final def notifyAll(): Unit

    Definition Classes
    AnyRef

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

    Definition Classes
    AnyRef

  25. def toString(): String

    Definition Classes
    AnyRef → Any

  26. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

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

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  28. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  29. def →[B](y: B): (BlackboxMacro, B)

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

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion StringAdd from BlackboxMacro to StringAdd[BlackboxMacro]

Inherited by implicit conversion StringFormat from BlackboxMacro to StringFormat[BlackboxMacro]

Inherited by implicit conversion Ensuring from BlackboxMacro to Ensuring[BlackboxMacro]

Inherited by implicit conversion ArrowAssoc from BlackboxMacro to ArrowAssoc[BlackboxMacro]

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