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//! Automatic `Arc` wrapping. use std::sync::Arc; /// # Automatic `Arc` wrapping /// /// The `Shared` trait provides automatic wrapping for things /// which take `Arc`s, meaning that anything which takes an argument /// of type `Shared<A>` will accept either an `A` or an `Arc<A>`. /// /// Because everything stored in `im`'s persistent data structures /// is wrapped in `Arc`s, `Shared` makes you have to worry less about /// whether what you've got is an `A` or an `Arc<A>` - the compiler /// will just figure it out for you, which is as it should be. pub trait Shared<T> { fn shared(self) -> Arc<T>; } impl<T> Shared<T> for T { fn shared(self) -> Arc<T> { Arc::from(self) } } impl<T> Shared<T> for Arc<T> { fn shared(self) -> Arc<T> { self } }