43 lines
1.0 KiB
Rust
43 lines
1.0 KiB
Rust
|
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
|
||
|
|
// file at the top-level directory of this distribution and at
|
||
|
|
// http://rust-lang.org/COPYRIGHT.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||
|
|
// option. This file may not be copied, modified, or distributed
|
||
|
|
// except according to those terms.
|
||
|
|
|
||
|
|
// Test that we can use method notation to call methods based on a
|
||
|
|
// where clause type, and not only type parameters.
|
||
|
|
|
||
|
|
trait Foo {
|
||
|
|
fn foo(&self) -> int;
|
||
|
|
}
|
||
|
|
|
||
|
|
impl Foo for Option<int>
|
||
|
|
{
|
||
|
|
fn foo(&self) -> int {
|
||
|
|
self.unwrap_or(22)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl Foo for Option<uint>
|
||
|
|
{
|
||
|
|
fn foo(&self) -> int {
|
||
|
|
self.unwrap_or(22) as int
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn check<T>(x: Option<T>) -> (int, int)
|
||
|
|
where Option<T> : Foo
|
||
|
|
{
|
||
|
|
let y: Option<T> = None;
|
||
|
|
(x.foo(), y.foo())
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
assert_eq!(check(Some(23u)), (23i, 22i));
|
||
|
|
assert_eq!(check(Some(23i)), (23i, 22i));
|
||
|
|
}
|