BuiltinEnumClass

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

BuiltinEnumClass contains the utility methods provided by enum classes

Under the hood, an enum class Foo : Bar will extend BuiltinEnumClass<HH\\MemberOf<this, Bar>>.

HHVM provides a native implementation for this class. The PHP class definition below is not actually used at run time; it is simply provided for the typechecker and for developer reference.

Interface Synopsis

namespace HH;

abstract class BuiltinEnumClass extends BuiltinAbstractEnumClass {...}

Public Methods

• ::getValues(): darray<string, T>
  Get the values of the public consts defined on this class, indexed by the string name of those consts
• ::valueOf<TEnum super this, TType>(EnumClass\Label<TEnum, TType> $label): MemberOf<TEnum, TType>

Public Methods (HH\BuiltinAbstractEnumClass)

• ::nameOf<TType>(EnumClass\Label<this, TType> $label): string