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// 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
// projection bound from a trait. Issue #20469.
///////////////////////////////////////////////////////////////////////////
trait MakeString {
fn make_string(&self) -> String;
}
impl MakeString for isize {
fn make_string(&self) -> String {
format!("{}", *self)
}
}
impl MakeString for usize {
fn make_string(&self) -> String {
format!("{}", *self)
}
}
///////////////////////////////////////////////////////////////////////////
trait Foo {
type F: MakeString;
fn get(&self) -> &Self::F;
}
fn foo<F:Foo>(f: &F) -> String {
f.get().make_string()
}
///////////////////////////////////////////////////////////////////////////
struct SomeStruct {
field: isize,
}
impl Foo for SomeStruct {
type F = isize;
fn get(&self) -> &isize {
&self.field
}
}
///////////////////////////////////////////////////////////////////////////
struct SomeOtherStruct {
field: usize,
}
impl Foo for SomeOtherStruct {
type F = usize;
fn get(&self) -> &usize {
&self.field
}
}
fn main() {
let x = SomeStruct { field: 22 };
assert_eq!(foo(&x), format!("22"));
let x = SomeOtherStruct { field: 44 };
assert_eq!(foo(&x), format!("44"));
}
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