Module starlark::values::enumeration

Fixed set enumerations, with runtime checking of validity.

Calling enum() produces an EnumType. Calling the EnumType creates an EnumValue.

The implementation ensures that each value of the enumeration is only stored once, so they may also provide (modest) memory savings. Created in starlark with the enum function:

Colors = enum("Red", "Green", "Blue")
val = Colors("Red")
assert_eq(val.value, "Red")
assert_eq(val.index, 0)
assert_eq(Colors[0], val)
assert_eq(Colors.type, "Colors")
assert_eq([v.value for v in Colors], ["Red", "Green", "Blue"])

Type Aliases

• EnumType
  Unfrozen enum type.
• EnumValue
  Type of value.
• FrozenEnumType
  Frozen enum type.
• FrozenEnumValue
  Type of frozen value.