Struct Arg 

pub struct Arg { /* private fields */ }

For storing a single argument. Stores a Box<> to argument variable, as well as a used flag.

Implementations

impl Arg

pub fn new(arg: Box<dyn Any>) -> Self

Create new Arg struct, moving ownership of Box pointer to an internal dynamically typed Any-trait variable.

pub fn from_argdata(arg_data: ArgData) -> Self

Like new(), but accepts an ArgData() instead of a raw Box<dyn Any>

pub fn poke<T>(&mut self) -> Result<&T, DynArgError<'_>>

where T: 'static,

Like get(), but marks the value as used. Because it changes self, it requires mutable access to self. This, of course, may make it unusable for some use cases.

pub fn get<T>(&self) -> Result<&T, DynArgError<'_>>

where T: 'static,

Retrieve a struct’s inner value. It’s recommended to explicitly specify type, e.g.:

use dynarg::Arg;
let mut arg = Arg::new(Box::new(42i32));
let arg = arg.get::<i32>();

pub fn used(&self) -> bool