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package scala
package reflect
package macros
/**
* <span class="badge badge-red" style="float: right;">EXPERIMENTAL</span>
*
* A slice of [[scala.reflect.macros.blackbox.Context the Scala macros context]] that defines shorthands for the
* most frequently used types and functions of the underlying compiler universe.
*/
trait Aliases {
self: blackbox.Context =>
/** The type of symbols representing declarations. */
type Symbol = universe.Symbol
/** The type of Scala types, and also Scala type signatures.
* (No difference is internally made between the two).
*/
type Type = universe.Type
/** The abstract type of names. */
type Name = universe.Name
/** The abstract type of names representing terms. */
type TermName = universe.TermName
/** The abstract type of names representing types. */
type TypeName = universe.TypeName
/** The type of Scala abstract syntax trees. */
type Tree = universe.Tree
/** Defines a universe-specific notion of positions. */
type Position = universe.Position
/** The base type of all scopes. */
type Scope = universe.Scope
/** The type of tree modifiers. */
type Modifiers = universe.Modifiers
/** The type of compilation runs. */
type Run = universe.Run
/** The type of compilation units. */
type CompilationUnit = universe.CompilationUnit
/** Expr wraps an abstract syntax tree and tags it with its type. */
type Expr[+T] = universe.Expr[T]
/** Constructor/Extractor for `Expr`. */
val Expr = universe.Expr
/** A shorthand to create an expr.
*
* Unlike the conventional expr factory, which requires a [[scala.reflect.api.TreeCreator]],
* this one accepts a regular tree, but the resulting exprs are unable of being migrated
* to other universes/mirrors (the functionality normally not needed for macros, since there is
* only one compile-time universe and only one compile-time mirror).
*/
def Expr[T: WeakTypeTag](tree: Tree): Expr[T]
/** The type of weak type tags. */
type WeakTypeTag[T] = universe.WeakTypeTag[T]
/** The type of type tags. */
type TypeTag[T] = universe.TypeTag[T]
/** Constructor/Extractor for `WeakTypeTag`. */
val WeakTypeTag = universe.WeakTypeTag
/** Constructor/Extractor for `TypeTag`. */
val TypeTag = universe.TypeTag
/** A shorthand to create a weak type tag.
*
* Unlike the conventional type tag factory, which requires a [[scala.reflect.api.TypeCreator]],
* this one accepts a regular type, but the resulting type tags are unable of being migrated
* to other universes/mirrors (the functionality normally not needed for macros, since there is
* only one compile-time universe and only one compile-time mirror).
*/
def WeakTypeTag[T](tpe: Type): WeakTypeTag[T]
/** A shorthand to create a type tag.
*
* Unlike the conventional type tag factory, which requires a [[scala.reflect.api.TypeCreator]],
* this one accepts a regular type, but the resulting type tags are unable of being migrated
* to other universes/mirrors (the functionality normally not needed for macros, since there is
* only one compile-time universe and only one compile-time mirror).
*/
def TypeTag[T](tpe: Type): TypeTag[T]
/**
* Shortcut for `implicitly[WeakTypeTag[T]]`
*/
def weakTypeTag[T](implicit attag: WeakTypeTag[T]) = attag
/**
* Shortcut for `implicitly[TypeTag[T]]`
*/
def typeTag[T](implicit ttag: TypeTag[T]) = ttag
/**
* Shortcut for `implicitly[WeakTypeTag[T]].tpe`
*/
def weakTypeOf[T](implicit attag: WeakTypeTag[T]): Type = attag.tpe
/**
* Shortcut for `implicitly[TypeTag[T]].tpe`
*/
def typeOf[T](implicit ttag: TypeTag[T]): Type = ttag.tpe
}
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