#![cfg_attr(feature = "min_specialization", feature(min_specialization))] #![cfg_attr(feature = "downcast_unchecked", feature(downcast_unchecked))] #![cfg_attr(feature = "const_sort", feature(const_trait_impl, const_mut_refs))] use std::any::type_name; use trait_cast_rs::{make_trait_castable_decl, TraitcastableAny, TraitcastableAnyInfra}; make_trait_castable_decl! { HybridPet => (Dog, Dog>, Cat), } struct HybridPet { name: String, } struct TestStruct(T); impl HybridPet { fn greet(&self) { println!("{}: Hi", self.name) } } impl Dog for HybridPet { fn bark(&self) { println!("{}: Woof({})!", self.name, type_name::()); } } impl Cat for HybridPet { fn meow(&self) { println!("{}: Meow(u128, {})!", self.name, type_name::()); } } trait Dog { fn bark(&self); } trait Cat { fn meow(&self); } #[cfg_attr(test, test)] fn main() { // The box is technically not needed but kept for added realism let pet = Box::new(HybridPet { name: "Kokusnuss".to_string(), }); pet.greet(); let castable_pet: Box = pet; let as_dog: &dyn Dog = castable_pet.downcast_ref().unwrap(); as_dog.bark(); let as_dog: &dyn Dog> = castable_pet.downcast_ref().unwrap(); as_dog.bark(); let as_cat: &dyn Cat = castable_pet.downcast_ref().unwrap(); as_cat.meow(); let cast_back: &HybridPet = castable_pet.downcast_ref().unwrap(); cast_back.greet(); }