Class scala.reflect.api.Types.TypeApi

This type as seen from prefix pre and class clazz. This means: Replace all ThisTypes of clazz or one of its subclasses by pre and instantiate all parameters by arguments of pre. Proceed analogously for ThisTypes referring to outer classes.

Example:

scala> import scala.reflect.runtime.universe._
import scala.reflect.runtime.universe._

scala> class D[T] { def m: T = ??? }
defined class D

scala> class C extends D[Int]
defined class C

scala> val D = typeOf[D[_]].typeSymbol.asClass
D: reflect.runtime.universe.ClassSymbol = class D

scala> val C = typeOf[C].typeSymbol.asClass
C: reflect.runtime.universe.ClassSymbol = class C

scala> val T = D.typeParams(0).asType.toType
T: reflect.runtime.universe.Type = T

scala> T.asSeenFrom(ThisType(C), D)
res0: reflect.runtime.universe.Type = scala.Int

The least type instance of given class which is a super-type of this type. Example:

class D[T]
class C extends p.D[Int]
ThisType(C).baseType(D) = p.D[Int]

Type signature of the companion of the underlying class symbol. NoType if the underlying symbol is not a class symbol, or if it doesn't have a companion.

Expands type aliases arising from type members. Note that type aliases can hide beneath singleton types and singleton types can hide inside type aliases. Moreover, aliases might lurk in the upper bounds of abstract types. Therefore careful thought has to be applied to identify and carry out unwrapping logic specific to your use case.

The defined or declared members with name name in this type; an OverloadedSymbol if several exist, NoSymbol if none exist. Alternatives of overloaded symbol appear in the order they are declared.

A Scope containing directly declared members of this type. Unlike members this method doesn't returns inherited members.

Members in the returned scope might appear in arbitrary order. Use declarations.sorted to get an ordered list of members.

Converts higher-kinded TypeRefs to PolyTypes. Functions on types are also implemented as PolyTypes.

Example: (in the below, <List> is the type constructor of List) TypeRef(pre, <List>, List()) is replaced by PolyType(X, TypeRef(pre, <List>, List(X)))

For a curried/nullary method or poly type its non-method result type, the type itself for all other types.

scala> class C {
     | def foo[T](x: T)(y: T) = ???
     | def bar: Int = ???
     | }
defined class C

scala> typeOf[C].member(TermName("foo")).asMethod
res0: reflect.runtime.universe.MethodSymbol = method foo

scala> res0.info // PolyType wrapping a MethodType
res1: reflect.runtime.universe.Type = [T](x: T)(y: T)scala.Nothing

scala> res1.resultType // MethodType wrapping a MethodType
res2: reflect.runtime.universe.Type = (x: T)(y: T)scala.Nothing

scala> res1.resultType.resultType // vanilla MethodType
res3: reflect.runtime.universe.Type = (y: T)scala.Nothing

scala> res1.resultType.resultType.resultType
res4: reflect.runtime.universe.Type = scala.Nothing

scala> res1.finalResultType
res5: reflect.runtime.universe.Type = scala.Nothing

scala> typeOf[C].member(TermName("bar")).asMethod
res6: reflect.runtime.universe.MethodSymbol = method bar

scala> res6.info
res7: reflect.runtime.universe.Type = => scala.Int

scala> res6.info.resultType
res8: reflect.runtime.universe.Type = scala.Int

scala> res6.info.finalResultType
res9: reflect.runtime.universe.Type = scala.Int

Apply f to each part of this type, returning a new type. children get mapped before their parents

A Scope containing all members of this type (directly declared or inherited). Unlike declarations this method also returns inherited members.

Members in the returned scope might appear in arbitrary order. Use declarations.sorted to get an ordered list of members.

For a (nullary) method or poly type, its direct result type (can be a MethodType if the method has multiple argument lists), the type itself for all other types.

scala> class C { def foo[T](x: T)(y: T) = ??? }
defined class C

scala> typeOf[C].member(TermName("foo")).asMethod
res0: reflect.runtime.universe.MethodSymbol = method foo

scala> res0.info // PolyType wrapping a MethodType
res1: reflect.runtime.universe.Type = [T](x: T)(y: T)scala.Nothing

scala> res1.resultType // MethodType wrapping a MethodType
res2: reflect.runtime.universe.Type = (x: T)(y: T)scala.Nothing

scala> res1.resultType.resultType // vanilla MethodType
res3: reflect.runtime.universe.Type = (y: T)scala.Nothing

scala> res1.resultType.resultType.resultType
res4: reflect.runtime.universe.Type = scala.Nothing

scala> res1.finalResultType
res5: reflect.runtime.universe.Type = scala.Nothing

List of type arguments ingrained in this type reference. Depending on your use case you might or might not want to call dealias first.

scala> type T = List[Int]
defined type alias T

scala> typeOf[T].typeArgs
res0: List[reflect.runtime.universe.Type] = List()

scala> typeOf[T].dealias.typeArgs
res1: List[reflect.runtime.universe.Type] = List(scala.Int)

Returns the corresponding type constructor (e.g. List for List[T] or List[String])

Does this type weakly conform to given type argument that, i.e., either conforms in terms of <:< or both are primitive number types that conform according to Section "Weak Conformance" in the spec. For example, Int weak_<:< Long.

If this is a singleton type, widen it to its nearest underlying non-singleton base type by applying one or more underlying dereferences. If this is not a singleton type, returns this type itself.

Example:

class Outer { class C ; val x: C } val o: Outer <o.x.type>.widen = o.C

Note that type aliases can hide beneath singleton types and singleton types can hide inside type aliases. Moreover, aliases might lurk in the upper bounds of abstract types. Therefore careful thought has to be applied to identify and carry out unwrapping logic specific to your use case.

Reduce to beta eta-long normal form. Expands type aliases and converts higher-kinded TypeRefs to PolyTypes. Functions on types are also implemented as PolyTypes.

Example: (in the below, <List> is the type constructor of List) TypeRef(pre, <List>, List()) is replaced by PolyType(X, TypeRef(pre, <List>, List(X)))