2012-12-10 19:32:48 -06:00
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// 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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2014-05-05 20:56:44 -05:00
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2012-07-11 17:00:40 -05:00
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trait double {
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2014-07-08 01:19:35 -05:00
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fn double(self: Box<Self>) -> uint;
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2012-07-11 17:00:40 -05:00
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}
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2014-05-05 20:56:44 -05:00
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impl double for Box<uint> {
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2014-07-08 01:19:35 -05:00
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fn double(self: Box<Box<uint>>) -> uint { **self * 2u }
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2012-06-19 22:52:33 -05:00
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}
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2013-02-01 21:43:17 -06:00
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pub fn main() {
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2014-05-05 20:56:44 -05:00
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let x = box box box box box 3u;
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2013-05-18 21:02:45 -05:00
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assert_eq!(x.double(), 6u);
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2012-06-19 22:52:33 -05:00
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}
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