The API of FlagSet instances.
An abstract type representing sets of flags (like private, final, etc.
All possible values that can constitute flag sets.
A module that contains all possible values that can constitute flag sets.
A tag that preserves the identity of the FlagSet abstract type from erasure.
A tag that preserves the identity of the FlagSet abstract type from erasure.
Can be used for pattern matching, instance tests, serialization and likes.
The empty set of flags
The API of FlagSet instances.
Returns string formatted according to given format string.
Returns string formatted according to given format string.
Format strings are as for String.format
(@see java.lang.String.format).
Implicit values that provide ClassTags for the reflection
classes. These are abstract in the interface but are later filled in to provide ClassTags
for the either the runtime reflection or macros entities, depending on the use.
EXPERIMENTAL
The trait that defines flag sets and operations on them.
Flags are used to provide modifiers for abstract syntax trees that represent definitions via theflagsfield of scala.reflect.api.Trees#Modifiers. Trees that accept modifiers are:For example, to create a class named
Cone would write something like:ClassDef(Modifiers(NoFlags), newTypeName("C"), Nil, ...)Here, the flag set is empty.
To make
Cprivate, 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
isXXXtest methods (e.g.isFinalcan be used to test finality). These test methods might require an upcast withasTerm,asTypeorasClassas 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
FlagSets and other aspects of Scala reflection, see the Reflection Guide