Macro objekt::clone_trait_object

macro_rules! clone_trait_object {
    ($($path:tt)+) => { ... };
}

Implement the standard library Clone for a trait object that has objekt::Clone as a supertrait.

trait MyTrait: objekt::Clone {
    /* ... */
}

objekt::clone_trait_object!(MyTrait);

// Now data structures containing Box<MyTrait> can derive Clone.
#[derive(Clone)]
struct Container {
    trait_object: Box<MyTrait>,
}

The macro supports traits that have type parameters and/or where clauses.

use std::io::Read;

trait Difficult<R>: objekt::Clone where R: Read {
    /* ... */
}

objekt::clone_trait_object!(<R> Difficult<R> where R: Read);