21df9c805f
over inherent methods accessible via more autoderefs.
This simplifies the trait matching algorithm. It breaks code like:
impl Foo {
fn foo(self) {
// before this change, this will be called
}
}
impl<'a,'b,'c> Trait for &'a &'b &'c Foo {
fn foo(self) {
// after this change, this will be called
}
}
fn main() {
let x = &(&(&Foo));
x.foo();
}
To explicitly indicate that you wish to call the inherent method, perform
explicit dereferences. For example:
fn main() {
let x = &(&(&Foo));
(***x).foo();
}
Part of #17282.
[breaking-change]
70 lines
1.6 KiB
Rust
70 lines
1.6 KiB
Rust
// Copyright 2012-2014 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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use std::fmt;
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struct cat {
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meows : uint,
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how_hungry : int,
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name : String,
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}
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impl cat {
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pub fn speak(&mut self) { self.meow(); }
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pub fn eat(&mut self) -> bool {
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if self.how_hungry > 0 {
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println!("OM NOM NOM");
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self.how_hungry -= 2;
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return true;
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}
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else {
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println!("Not hungry!");
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return false;
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}
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}
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}
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impl cat {
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fn meow(&mut self) {
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println!("Meow");
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self.meows += 1u;
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if self.meows % 5u == 0u {
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self.how_hungry += 1;
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}
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}
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}
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fn cat(in_x : uint, in_y : int, in_name: String) -> cat {
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cat {
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meows: in_x,
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how_hungry: in_y,
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name: in_name
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}
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}
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impl fmt::Show for cat {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.name)
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}
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}
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fn print_out(thing: Box<ToString>, expected: String) {
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let actual = (*thing).to_string();
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println!("{}", actual);
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assert_eq!(actual.to_string(), expected);
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}
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pub fn main() {
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let nyan: Box<ToString> = box cat(0u, 2, "nyan".to_string()) as Box<ToString>;
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print_out(nyan, "nyan".to_string());
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}
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