73 lines
1.8 KiB
Rust
73 lines
1.8 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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pub trait plus {
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fn plus(&self) -> int;
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}
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mod a {
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use plus;
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impl plus for uint { fn plus(&self) -> int { *self as int + 20 } }
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}
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mod b {
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use plus;
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impl plus for String { fn plus(&self) -> int { 200 } }
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}
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trait uint_utils {
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fn str(&self) -> String;
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fn multi(&self, f: |uint|);
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}
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impl uint_utils for uint {
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fn str(&self) -> String {
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self.to_string()
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}
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fn multi(&self, f: |uint|) {
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let mut c = 0u;
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while c < *self { f(c); c += 1u; }
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}
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}
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trait vec_utils<T> {
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fn length_(&self, ) -> uint;
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fn iter_(&self, f: |&T|);
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fn map_<U>(&self, f: |&T| -> U) -> Vec<U> ;
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}
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impl<T> vec_utils<T> for Vec<T> {
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fn length_(&self) -> uint { self.len() }
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fn iter_(&self, f: |&T|) { for x in self.iter() { f(x); } }
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fn map_<U>(&self, f: |&T| -> U) -> Vec<U> {
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let mut r = Vec::new();
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for elt in self.iter() {
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r.push(f(elt));
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}
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r
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}
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}
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pub fn main() {
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assert_eq!(10u.plus(), 30);
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assert_eq!(("hi".to_string()).plus(), 200);
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assert_eq!((vec!(1i)).length_().str(), "1".to_string());
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let vect = vec!(3i, 4).map_(|a| *a + 4);
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assert_eq!(*vect.get(0), 7);
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let vect = (vec!(3i, 4)).map_::<uint>(|a| *a as uint + 4u);
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assert_eq!(*vect.get(0), 7u);
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let mut x = 0u;
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10u.multi(|_n| x += 2u );
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assert_eq!(x, 20u);
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}
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