src/test/run-pass/static-function-pointer.rs

   1 // Copyright 2013 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.
   4 //
   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.
  10
  11 fn f(x: int) -> int { x }
  12 fn g(x: int) -> int { 2 * x }
  13
  14 static F: fn(int) -> int = f;
  15 static mut G: fn(int) -> int = f;
  16
  17 pub fn main() {
  18     assert_eq!(F(42), 42);
  19     unsafe {
  20         assert_eq!(G(42), 42);
  21         G = g;
  22         assert_eq!(G(42), 84);
  23     }
  24 }