rust/src/test/run-pass/box-unbox.rs

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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
struct Box<T> {c: @T}
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fn unbox<T:Copy>(b: Box<T>) -> T { return *b.c; }
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pub fn main() {
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let foo: int = 17;
let bfoo: Box<int> = Box {c: @foo};
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debug!("see what's in our box");
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assert!((unbox::<int>(bfoo) == foo));
}