src/test/run-pass/static-impl.rs

   1 // Copyright 2012-2014 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.
   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
  12
  13 // pretty-expanded FIXME #23616
  14
  15 pub trait plus {
  16     fn plus(&self) -> isize;
  17 }
  18
  19 mod a {
  20     use plus;
  21     impl plus for usize { fn plus(&self) -> isize { *self as isize + 20 } }
  22 }
  23
  24 mod b {
  25     use plus;
  26     impl plus for String { fn plus(&self) -> isize { 200 } }
  27 }
  28
  29 trait uint_utils {
  30     fn str(&self) -> String;
  31     fn multi<F>(&self, f: F) where F: FnMut(usize);
  32 }
  33
  34 impl uint_utils for usize {
  35     fn str(&self) -> String {
  36         self.to_string()
  37     }
  38     fn multi<F>(&self, mut f: F) where F: FnMut(usize) {
  39         let mut c = 0_usize;
  40         while c < *self { f(c); c += 1_usize; }
  41     }
  42 }
  43
  44 trait vec_utils<T> {
  45     fn length_(&self, ) -> usize;
  46     fn iter_<F>(&self, f: F) where F: FnMut(&T);
  47     fn map_<U, F>(&self, f: F) -> Vec<U> where F: FnMut(&T) -> U;
  48 }
  49
  50 impl<T> vec_utils<T> for Vec<T> {
  51     fn length_(&self) -> usize { self.len() }
  52     fn iter_<F>(&self, mut f: F) where F: FnMut(&T) { for x in self { f(x); } }
  53     fn map_<U, F>(&self, mut f: F) -> Vec<U> where F: FnMut(&T) -> U {
  54         let mut r = Vec::new();
  55         for elt in self {
  56             r.push(f(elt));
  57         }
  58         r
  59     }
  60 }
  61
  62 pub fn main() {
  63     assert_eq!(10_usize.plus(), 30);
  64     assert_eq!(("hi".to_string()).plus(), 200);
  65
  66     assert_eq!((vec!(1)).length_().str(), "1".to_string());
  67     let vect = vec!(3, 4).map_(|a| *a + 4);
  68     assert_eq!(vect[0], 7);
  69     let vect = (vec!(3, 4)).map_::<usize, _>(|a| *a as usize + 4_usize);
  70     assert_eq!(vect[0], 7_usize);
  71     let mut x = 0_usize;
  72     10_usize.multi(|_n| x += 2_usize );
  73     assert_eq!(x, 20_usize);
  74 }