0ac7a219f0
- Made naming schemes consistent between Option, Result and Either - Changed Options Add implementation to work like the maybe monad (return None if any of the inputs is None) - Removed duplicate Option::get and renamed all related functions to use the term `unwrap` instead
24 lines
759 B
Rust
24 lines
759 B
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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fn select<'r>(x: &'r Option<int>, y: &'r Option<int>) -> &'r Option<int> {
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match (x, y) {
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(&None, &None) => x,
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(&Some(_), _) => x,
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(&None, &Some(_)) => y
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}
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}
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pub fn main() {
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let x = None;
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let y = Some(3);
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assert_eq!(select(&x, &y).unwrap(), 3);
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}
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