| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // pretty-expanded FIXME #23616 |
| |
| use std::rc::Rc; |
| |
| // Examples from the "deref coercions" RFC, at rust-lang/rfcs#241. |
| |
| fn use_ref<T>(_: &T) {} |
| fn use_mut<T>(_: &mut T) {} |
| |
| fn use_rc<T>(t: Rc<T>) { |
| use_ref(&*t); // what you have to write today |
| use_ref(&t); // what you'd be able to write |
| use_ref(&&&&&&t); |
| use_ref(&mut &&&&&t); |
| use_ref(&&&mut &&&t); |
| } |
| |
| fn use_mut_box<T>(mut t: &mut Box<T>) { |
| use_mut(&mut *t); // what you have to write today |
| use_mut(t); // what you'd be able to write |
| use_mut(&mut &mut &mut t); |
| |
| use_ref(&*t); // what you have to write today |
| use_ref(t); // what you'd be able to write |
| use_ref(&&&&&&t); |
| use_ref(&mut &&&&&t); |
| use_ref(&&&mut &&&t); |
| } |
| |
| fn use_nested<T>(t: &Box<T>) { |
| use_ref(&**t); // what you have to write today |
| use_ref(t); // what you'd be able to write (note: recursive deref) |
| use_ref(&&&&&&t); |
| use_ref(&mut &&&&&t); |
| use_ref(&&&mut &&&t); |
| } |
| |
| fn use_slice(_: &[u8]) {} |
| fn use_slice_mut(_: &mut [u8]) {} |
| |
| fn use_vec(mut v: Vec<u8>) { |
| use_slice_mut(&mut v[..]); // what you have to write today |
| use_slice_mut(&mut v); // what you'd be able to write |
| use_slice_mut(&mut &mut &mut v); |
| |
| use_slice(&v[..]); // what you have to write today |
| use_slice(&v); // what you'd be able to write |
| use_slice(&&&&&&v); |
| use_slice(&mut &&&&&v); |
| use_slice(&&&mut &&&v); |
| } |
| |
| fn use_vec_ref(v: &Vec<u8>) { |
| use_slice(&v[..]); // what you have to write today |
| use_slice(v); // what you'd be able to write |
| use_slice(&&&&&&v); |
| use_slice(&mut &&&&&v); |
| use_slice(&&&mut &&&v); |
| } |
| |
| pub fn main() {} |