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// run-pass
#![allow(non_camel_case_types)]
pub trait plus {
fn plus(&self) -> isize;
}
mod a {
use plus;
impl plus for usize { fn plus(&self) -> isize { *self as isize + 20 } }
}
mod b {
use plus;
impl plus for String { fn plus(&self) -> isize { 200 } }
}
trait uint_utils {
fn str(&self) -> String;
fn multi<F>(&self, f: F) where F: FnMut(usize);
}
impl uint_utils for usize {
fn str(&self) -> String {
self.to_string()
}
fn multi<F>(&self, mut f: F) where F: FnMut(usize) {
let mut c = 0_usize;
while c < *self { f(c); c += 1_usize; }
}
}
trait vec_utils<T> {
fn length_(&self, ) -> usize;
fn iter_<F>(&self, f: F) where F: FnMut(&T);
fn map_<U, F>(&self, f: F) -> Vec<U> where F: FnMut(&T) -> U;
}
impl<T> vec_utils<T> for Vec<T> {
fn length_(&self) -> usize { self.len() }
fn iter_<F>(&self, mut f: F) where F: FnMut(&T) { for x in self { f(x); } }
fn map_<U, F>(&self, mut f: F) -> Vec<U> where F: FnMut(&T) -> U {
let mut r = Vec::new();
for elt in self {
r.push(f(elt));
}
r
}
}
pub fn main() {
assert_eq!(10_usize.plus(), 30);
assert_eq!(("hi".to_string()).plus(), 200);
assert_eq!((vec![1]).length_().str(), "1".to_string());
let vect = vec![3, 4].map_(|a| *a + 4);
assert_eq!(vect[0], 7);
let vect = (vec![3, 4]).map_::<usize, _>(|a| *a as usize + 4_usize);
assert_eq!(vect[0], 7_usize);
let mut x = 0_usize;
10_usize.multi(|_n| x += 2_usize );
assert_eq!(x, 20_usize);
}
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