Trait Visitor

pub trait Visitor<'arg> {
    type Value;

    // Required methods
    fn visit_positional(self, argument: &'arg Arg) -> Self::Value;
    fn visit_long_option(
        self,
        option: &'arg Arg,
        argument: &'arg Arg,
    ) -> Self::Value;
    fn visit_long(
        self,
        option: &'arg Arg,
        arg: impl ArgAccess<'arg>,
    ) -> Self::Value;
    fn visit_short(self, option: u8, arg: impl ArgAccess<'arg>) -> Self::Value;
}

The ArgumentsParser type operates by passing arguments it finds into a Visitor, to be handled.

Required Associated Types

type Value

Required Methods

fn visit_positional(self, argument: &'arg Arg) -> Self::Value

A positional parameter.

fn visit_long_option( self, option: &'arg Arg, argument: &'arg Arg, ) -> Self::Value

A long option that definitely has an argument, because it was given as --option=argument

fn visit_long(self, option: &'arg Arg, arg: impl ArgAccess<'arg>) -> Self::Value

A long option or flag, such as --option

fn visit_short(self, option: u8, arg: impl ArgAccess<'arg>) -> Self::Value

A long option or flag, such as -o

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors