src/test/run-pass/static-mut-foreign.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 // Constants (static variables) can be used to match in patterns, but mutable
  12 // statics cannot. This ensures that there's some form of error if this is
  13 // attempted.
  14
  15
  16 #![feature(libc)]
  17
  18 extern crate libc;
  19
  20 #[link(name = "rust_test_helpers")]
  21 extern {
  22     static mut rust_dbg_static_mut: libc::c_int;
  23     pub fn rust_dbg_static_mut_check_four();
  24 }
  25
  26 unsafe fn static_bound(_: &'static libc::c_int) {}
  27
  28 fn static_bound_set(a: &'static mut libc::c_int) {
  29     *a = 3;
  30 }
  31
  32 unsafe fn run() {
  33     assert!(rust_dbg_static_mut == 3);
  34     rust_dbg_static_mut = 4;
  35     assert!(rust_dbg_static_mut == 4);
  36     rust_dbg_static_mut_check_four();
  37     rust_dbg_static_mut += 1;
  38     assert!(rust_dbg_static_mut == 5);
  39     rust_dbg_static_mut *= 3;
  40     assert!(rust_dbg_static_mut == 15);
  41     rust_dbg_static_mut = -3;
  42     assert!(rust_dbg_static_mut == -3);
  43     static_bound(&rust_dbg_static_mut);
  44     static_bound_set(&mut rust_dbg_static_mut);
  45 }
  46
  47 pub fn main() {
  48     unsafe { run() }
  49 }