Trait OptionalArg

pub trait OptionalArg: Sized {
    // Required methods
    fn parse(arg: impl AsRef<str>, arg: ArgRef) -> Result<Self, Error>;
    fn default() -> Self;

    // Provided method
    fn map_parse(
        val: Option<impl AsRef<str>>,
        arg: ArgRef,
    ) -> Result<Self, Error> { ... }
}

Required Methods

fn parse(arg: impl AsRef<str>, arg: ArgRef) -> Result<Self, Error>

fn default() -> Self

Provided Methods

fn map_parse(val: Option<impl AsRef<str>>, arg: ArgRef) -> Result<Self, Error>

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.

Implementations on Foreign Types

impl<T: Argument> OptionalArg for Option<T>

fn parse(val: impl AsRef<str>, arg: ArgRef) -> Result<Self, Error>

fn default() -> Self

Implementors