Abstract base class for enumerations — Enum • s7x

A scalar character value drawn from a fixed set of variants. Use new_enum() to create concrete subclasses.

Usage

Enum(value = character(0), variants = character(0), allow_na = logical(0))

Arguments

value: String. The enum's current value.
variants: Character vector. Allowed values.
allow_na: Bool. Whether NA_character_ is a valid value.

Examples

GridShape <- new_enum("GridShape", c("Square", "Hexagon"))
S7::S7_inherits(GridShape("Square"), Enum)
#> [1] TRUE