Trait clap::ValueEnum

source · 
pub trait ValueEnum: Sized + Clone {
    fn value_variants<'a>() -> &'a [Self] ⓘ;
    fn to_possible_value(&self) -> Option<PossibleValue>;

    fn from_str(input: &str, ignore_case: bool) -> Result<Self, String> { ... }
}
Expand description

Parse arguments into enums.

When deriving Parser, a field whose type implements ValueEnum can have the attribute #[arg(value_enum)] which will

  • Call EnumValueParser
  • Allowing using the #[arg(default_value_t)] attribute without implementing Display.

NOTE: Deriving requires the derive feature flag

Required Methods§

All possible argument values, in display order.

The canonical argument value.

The value is None for skipped variants.

Provided Methods§

Parse an argument into Self.

Implementors§