clap::simple_enum!
[−]
[src]
macro_rules! simple_enum { ($e:ident => $($v:ident),+) => { ... }; }
Convenience macro generated a simple enum with variants to be used as a type when parsing
arguments. This enum also provides a variants()
function which can be used to retrieve a
Vec<&'static str>
of the variant names.
NOTE: This macro automaically implements std::str::FromStr and std::fmt::Display
Example
simple_enum!{Foo => Bar, Baz, Qux} // Foo enum can now be used via Foo::Bar, or Foo::Baz, etc // and implements std::str::FromStr to use with the value_t! macros fn main() { let enum_vals = ["Bar", "Baz", "Qux"]; let m = App::new("app") .arg(Arg::from_usage("<foo> 'the foo'") .possible_values(&enum_vals)) .get_matches(); let f = value_t_or_exit!(m.value_of("foo"), Foo); // Use f like any other Foo variant... }