53 lines
1.4 KiB
Rust
53 lines
1.4 KiB
Rust
// Copyright 2012 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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// xfail-fast
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trait to_str {
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fn to_string(&self) -> ~str;
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}
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impl to_str for int {
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fn to_string(&self) -> ~str { self.to_str() }
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}
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impl to_str for ~str {
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fn to_string(&self) -> ~str { self.clone() }
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}
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impl to_str for () {
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fn to_string(&self) -> ~str { ~"()" }
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}
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trait map<T> {
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fn map<U>(&self, f: &fn(&T) -> U) -> ~[U];
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}
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impl<T> map<T> for ~[T] {
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fn map<U>(&self, f: &fn(&T) -> U) -> ~[U] {
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let mut r = ~[];
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// FIXME: #7355 generates bad code with VecIterator
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for i in range(0u, self.len()) {
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r.push(f(&self[i]));
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}
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r
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}
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}
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fn foo<U, T: map<U>>(x: T) -> ~[~str] {
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x.map(|_e| ~"hi" )
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}
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fn bar<U:to_str,T:map<U>>(x: T) -> ~[~str] {
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x.map(|_e| _e.to_string() )
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}
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pub fn main() {
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assert_eq!(foo(~[1]), ~[~"hi"]);
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assert_eq!(bar::<int, ~[int]>(~[4, 5]), ~[~"4", ~"5"]);
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assert_eq!(bar::<~str, ~[~str]>(~[~"x", ~"y"]), ~[~"x", ~"y"]);
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assert_eq!(bar::<(), ~[()]>(~[()]), ~[~"()"]);
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}
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