Trait AsAny

Source

pub trait AsAny: 'static {
    // Required methods
    fn as_any(&self) -> &dyn Any;
    fn mut_any(&mut self) -> &mut dyn Any;
    fn to_any(self: Box<Self>) -> Box<dyn Any>;
}

Expand description

This trait allows downcasting dyn Trait to dyn Any, which is neccesary when using the downcast functions of Any with another trait

§Examples

use std::any::Any;
use dabus::extras::AsAny;

// you have this struct
struct Foo;

// and want to use it as `dyn Bar`
trait Bar: AsAny {
    fn do_something(&self);
}

impl Bar for Foo {
    fn do_something(&self) {
        // some work is done here probably
    }
}
// but how do you do that?
let dyn_bar: Box<dyn Bar> = Box::new(Foo);

// use it as that trait
dyn_bar.do_something();

// using AsAny, you can cast dyn Bar to dyn Any, and then call .downcast() on it
let foo_again: Foo = *dyn_bar.to_any().downcast().unwrap();
// tada