scala.reflect.api

# FlagSets

#### trait FlagSets extends AnyRef

EXPERIMENTAL

The trait that defines flag sets and operations on them.

`Flag`s are used to provide modifiers for abstract syntax trees that represent definitions via the `flags` field of scala.reflect.api.Trees#Modifiers. Trees that accept modifiers are:

- scala.reflect.api.Trees#ClassDef. Classes and traits.
- scala.reflect.api.Trees#ModuleDef. Objects.
- scala.reflect.api.Trees#ValDef. Vals, vars, parameters and self-type annotations.
- scala.reflect.api.Trees#DefDef. Methods and constructors.
- scala.reflect.api.Trees#TypeDef. Type aliases, abstract type members and type parameters.

For example, to create a class named `C` one would write something like:

    ClassDef(Modifiers(NoFlags), newTypeName("C"), Nil, ...)

Here, the flag set is empty.

To make `C` private, one would write something like:

    ClassDef(Modifiers(PRIVATE), newTypeName("C"), Nil, ...)

Flags can also be combined with the vertical bar operator (`|`). For example, a private final class is written something like:

    ClassDef(Modifiers(PRIVATE | FINAL), newTypeName("C"), Nil, ...)

The list of all available flags is defined in scala.reflect.api.FlagSets#FlagValues, available via scala.reflect.api.FlagSets#Flag. (Typically one writes a wildcard import for this, e.g. `import scala.reflect.runtime.universe.Flag._`).

Definition trees are compiled down to symbols, so flags on modifiers of these trees are transformed into flags on the resulting symbols. Unlike trees, symbols don't expose flags, but rather provide `isXXX` test methods (e.g. `isFinal` can be used to test finality). These test methods might require an upcast with `asTerm`, `asType` or `asClass` as some flags only make sense for certain kinds of symbols.

Of Note: This part of the Reflection API is being considered as a candidate for redesign. It is quite possible that in future releases of the reflection API, flag sets could be replaced with something else.

For more details about `FlagSet`s and other aspects of Scala reflection, see the Reflection Guide

Self Type
  Universe
Source
  FlagSets.scala

Linear Supertypes
AnyRef, Any
Known Subclasses
JavaUniverse, Universe, Universe
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Inherited

1. FlagSets
2. AnyRef
3. Any

Implicitly

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

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### Type Members

1. #### trait FlagOps extends Any

   The API of `FlagSet` instances.

   The API of `FlagSet` instances. The main source of information about flag sets is the scala.reflect.api.FlagSets page.

2. #### abstract type FlagSet

   An abstract type representing sets of flags (like private, final, etc.) that apply to definition trees and symbols

3. #### trait FlagValues extends AnyRef

   All possible values that can constitute flag sets.

   All possible values that can constitute flag sets. The main source of information about flag sets is the scala.reflect.api.FlagSets page.

### Abstract Value Members

1. #### abstract val Flag: Universe.FlagValues

   A module that contains all possible values that can constitute flag sets.

2. #### abstract val NoFlags: Universe.FlagSet

   The empty set of flags

3. #### implicit abstract def addFlagOps(left: Universe.FlagSet): Universe.FlagOps

   The API of `FlagSet` instances.

### 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 FlagSets to any2stringadd[FlagSets] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

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

   Implicit information
     This member is added by an implicit conversion from FlagSets to ArrowAssoc[FlagSets] 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 clone(): AnyRef

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

8. #### def ensuring(cond: (FlagSets) ⇒ Boolean, msg: ⇒ Any): FlagSets

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

9. #### def ensuring(cond: (FlagSets) ⇒ Boolean): FlagSets

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

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

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

11. #### def ensuring(cond: Boolean): FlagSets

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

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef → Any

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

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

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

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

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      Any

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

27. #### def →[B](y: B): (FlagSets, B)

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

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Flags

### Ungrouped