Struct OptSpec 

pub struct OptSpec<'a, U> { /* private fields */ }

An option/flag specification.

Implementations

impl<'a, U> OptSpec<'a, U>

pub const fn new(name: &'a str, cb: OptCallback<U>) -> Self

Create a new option.

pub const fn numeric(self) -> Self

Set value hint

pub const fn short(self, short: char) -> Self

Set short form.

pub const fn metavar(self, metavar: &'a str) -> Self

Set metavar.

pub const fn help(self, help: &'a str) -> Self

Set help text.

pub const fn arg(self, arg: ArgKind) -> Self

Set argument kind.

pub const fn optional(self) -> Self

Set optional

pub const fn required(self) -> Self

Set required

pub const fn flag(self) -> Self

Set flag

pub const fn env(self, env: &'a str) -> Self

Set environment variable name.

pub const fn default(self, val: &'a str) -> Self

Set default value.

pub const fn at_most_one(self, group_id: u16) -> Self

Set at most one state and group identifier.

pub const fn at_least_one(self, group_id: u16) -> Self

Set at least one state and group identifier.

Trait Implementations

impl<'a, U: Clone> Clone for OptSpec<'a, U>

fn clone(&self) -> OptSpec<'a, U>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, U: Copy> Copy for OptSpec<'a, U>