| // Copyright 2012-2014 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. |
| |
| #![allow(unused_must_use)] |
| #![allow(dead_code)] |
| use std::thread; |
| |
| fn user(_i: isize) {} |
| |
| fn foo() { |
| // Here, i is *copied* into the proc (heap closure). |
| // Requires allocation. The proc's copy is not mutable. |
| let mut i = 0; |
| let t = thread::spawn(move|| { |
| user(i); |
| println!("spawned {}", i) |
| }); |
| i += 1; |
| println!("original {}", i); |
| t.join(); |
| } |
| |
| fn bar() { |
| // Here, the original i has not been moved, only copied, so is still |
| // mutable outside of the proc. |
| let mut i = 0; |
| while i < 10 { |
| let t = thread::spawn(move|| { |
| user(i); |
| }); |
| i += 1; |
| t.join(); |
| } |
| } |
| |
| fn car() { |
| // Here, i must be shadowed in the proc to be mutable. |
| let mut i = 0; |
| while i < 10 { |
| let t = thread::spawn(move|| { |
| let mut i = i; |
| i += 1; |
| user(i); |
| }); |
| i += 1; |
| t.join(); |
| } |
| } |
| |
| pub fn main() {} |