Macro dyn_hash::hash_trait_object

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

Implement the standard library Hash for a trait object that has DynHash as a supertrait.

use dyn_hash::DynHash;

trait MyTrait: DynHash {
    /* ... */
}

dyn_hash::hash_trait_object!(MyTrait);

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

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

use dyn_hash::DynHash;
use std::io::Read;

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

dyn_hash::hash_trait_object!(<R> Difficult<R> where R: Read);