/** * Originally from Intertrait by CodeChain * * <https://github.com/CodeChain-io/intertrait> * <https://crates.io/crates/intertrait/0.2.2> * * Licensed under either of * * Apache License, Version 2.0 (LICENSE-APACHE or <http://www.apache.org/licenses/LICENSE-2.0>) * MIT license (LICENSE-MIT or <http://opensource.org/licenses/MIT>) * at your option. */ use std::rc::Rc; use crate::libs::intertrait::{caster, CastFrom}; pub trait CastRc { /// Casts an `Rc` for this trait into that for type `T`. fn cast<T: ?Sized + 'static>(self: Rc<Self>) -> Result<Rc<T>, Rc<Self>>; } /// A blanket implementation of `CastRc` for traits extending `CastFrom`. impl<S: ?Sized + CastFrom> CastRc for S { fn cast<T: ?Sized + 'static>(self: Rc<Self>) -> Result<Rc<T>, Rc<Self>> { match caster::<T>((*self).type_id()) { Some(caster) => Ok((caster.cast_rc)(self.rc_any())), None => Err(self), } } }