1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Checks that extern fn pointers implement the full range of Fn traits.
13 #![feature(unboxed_closures)]
14 #![feature(unboxed_closures)]
16 use std::ops::{Fn,FnMut,FnOnce};
18 fn square(x: int) -> int { x * x }
20 fn call_it<F:Fn(int)->int>(f: &F, x: int) -> int {
24 fn call_it_mut<F:FnMut(int)->int>(f: &mut F, x: int) -> int {
28 fn call_it_once<F:FnOnce(int)->int>(f: F, x: int) -> int {
33 let x = call_it(&square, 22);
34 let y = call_it_mut(&mut square, 22);
35 let z = call_it_once(square, 22);
36 assert_eq!(x, square(22));
37 assert_eq!(y, square(22));
38 assert_eq!(z, square(22));