57 lines
1.4 KiB
Rust
57 lines
1.4 KiB
Rust
// Copyright 2012 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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//xfail-test
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// Sketching traits.
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// methods with no implementation are required; methods with an
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// implementation are provided. No "req" keyword necessary.
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trait Eq {
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fn eq(a: self) -> bool;
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fn neq(a: self) -> bool {
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!self.eq(a)
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}
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}
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// The `<` is pronounced `extends`. Also under consideration is `<:`.
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// Just using `:` is frowned upon, because (paraphrasing dherman) `:`
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// is supposed to separate things from different universes.
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trait Ord < Eq {
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fn lt(a: self) -> bool;
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fn lte(a: self) -> bool {
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self.lt(a) || self.eq(a)
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}
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fn gt(a: self) -> bool {
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!self.lt(a) && !self.eq(a)
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}
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fn gte(a: self) -> bool {
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!self.lt(a)
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}
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}
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// pronounced "impl of Ord for int" -- not sold on this yet
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impl Ord for int {
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fn lt(a: &int) -> bool {
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self < (*a)
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}
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// is this the place to put this?
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fn eq(a: &int) -> bool {
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self == (*a)
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}
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}
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