79 lines
1.7 KiB
Rust
79 lines
1.7 KiB
Rust
// Copyright 2014 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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// Test that we can use method notation to call methods based on a
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// projection bound from a trait. Issue #20469.
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///////////////////////////////////////////////////////////////////////////
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trait MakeString {
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fn make_string(&self) -> String;
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}
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impl MakeString for int {
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fn make_string(&self) -> String {
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format!("{}", *self)
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}
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}
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impl MakeString for uint {
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fn make_string(&self) -> String {
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format!("{}", *self)
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}
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}
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///////////////////////////////////////////////////////////////////////////
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trait Foo {
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type F: MakeString;
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fn get(&self) -> &Self::F;
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}
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fn foo<F:Foo>(f: &F) -> String {
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f.get().make_string()
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}
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///////////////////////////////////////////////////////////////////////////
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struct SomeStruct {
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field: int,
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}
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impl Foo for SomeStruct {
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type F = int;
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fn get(&self) -> &int {
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&self.field
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}
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}
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///////////////////////////////////////////////////////////////////////////
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struct SomeOtherStruct {
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field: uint,
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}
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impl Foo for SomeOtherStruct {
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type F = uint;
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fn get(&self) -> &uint {
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&self.field
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}
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}
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fn main() {
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let x = SomeStruct { field: 22 };
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assert_eq!(foo(&x), format!("22"));
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let x = SomeOtherStruct { field: 44 };
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assert_eq!(foo(&x), format!("44"));
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}
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