6f99a27886
This implements RFC 39. Omitted lifetimes in return values will now be inferred to more useful defaults, and an error is reported if a lifetime in a return type is omitted and one of the two lifetime elision rules does not specify what it should be. This primarily breaks two uncommon code patterns. The first is this: unsafe fn get_foo_out_of_thin_air() -> &Foo { ... } This should be changed to: unsafe fn get_foo_out_of_thin_air() -> &'static Foo { ... } The second pattern that needs to be changed is this: enum MaybeBorrowed<'a> { Borrowed(&'a str), Owned(String), } fn foo() -> MaybeBorrowed { Owned(format!("hello world")) } Change code like this to: enum MaybeBorrowed<'a> { Borrowed(&'a str), Owned(String), } fn foo() -> MaybeBorrowed<'static> { Owned(format!("hello world")) } Closes #15552. [breaking-change]
79 lines
1.9 KiB
Rust
79 lines
1.9 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::cmp;
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use std::ops;
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#[deriving(Show)]
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struct Point {
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x: int,
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y: int
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}
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impl ops::Add<Point,Point> for Point {
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fn add(&self, other: &Point) -> Point {
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Point {x: self.x + (*other).x, y: self.y + (*other).y}
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}
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}
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impl ops::Sub<Point,Point> for Point {
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fn sub(&self, other: &Point) -> Point {
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Point {x: self.x - (*other).x, y: self.y - (*other).y}
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}
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}
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impl ops::Neg<Point> for Point {
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fn neg(&self) -> Point {
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Point {x: -self.x, y: -self.y}
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}
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}
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impl ops::Not<Point> for Point {
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fn not(&self) -> Point {
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Point {x: !self.x, y: !self.y }
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}
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}
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impl ops::Index<bool,int> for Point {
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fn index(&self, x: &bool) -> &int {
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if *x {
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&self.x
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} else {
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&self.y
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}
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}
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}
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impl cmp::PartialEq for Point {
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fn eq(&self, other: &Point) -> bool {
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(*self).x == (*other).x && (*self).y == (*other).y
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}
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fn ne(&self, other: &Point) -> bool { !(*self).eq(other) }
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}
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pub fn main() {
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let mut p = Point {x: 10, y: 20};
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p = p + Point {x: 101, y: 102};
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p = p - Point {x: 100, y: 100};
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assert_eq!(p + Point {x: 5, y: 5}, Point {x: 16, y: 27});
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assert_eq!(-p, Point {x: -11, y: -22});
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assert_eq!(p[true], 11);
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assert_eq!(p[false], 22);
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let q = !p;
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assert_eq!(q.x, !(p.x));
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assert_eq!(q.y, !(p.y));
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// Issue #1733
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let result: proc(int) = proc(_)();
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result(p[true]);
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}
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