mirror of https://github.com/rust-lang/rust
22 lines
447 B
Rust
22 lines
447 B
Rust
//@ run-pass
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#![allow(non_camel_case_types)]
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trait vec_utils<T> {
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fn map_<U, F>(x: &Self, f: F) -> Vec<U> where F: FnMut(&T) -> U;
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}
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impl<T> vec_utils<T> for Vec<T> {
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fn map_<U, F>(x: &Vec<T> , mut f: F) -> Vec<U> where F: FnMut(&T) -> U {
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let mut r = Vec::new();
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for elt in x {
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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!(vec_utils::map_(&vec![1,2,3], |&x| x+1), [2,3,4]);
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}
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