| // 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. |
| |
| use std::ops::FnMut; |
| |
| fn call_f<F:FnMut()>(mut f: F) { |
| f(); |
| } |
| |
| fn f() { |
| println!("hello"); |
| } |
| |
| fn call_g<G:FnMut(String,String) -> String>(mut g: G, x: String, y: String) |
| -> String { |
| g(x, y) |
| } |
| |
| fn g(mut x: String, y: String) -> String { |
| x.push_str(&y); |
| x |
| } |
| |
| fn main() { |
| call_f(f); |
| assert_eq!(call_g(g, "foo".to_string(), "bar".to_string()), |
| "foobar"); |
| } |