44 lines
1.2 KiB
Rust
44 lines
1.2 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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#![allow(unknown_features)]
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#![feature(box_syntax)]
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use std::mem::swap;
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#[derive(Debug)]
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struct Ints {sum: Box<isize>, values: Vec<isize> }
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fn add_int(x: &mut Ints, v: isize) {
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*x.sum += v;
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let mut values = Vec::new();
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swap(&mut values, &mut x.values);
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values.push(v);
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swap(&mut values, &mut x.values);
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}
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fn iter_ints<F>(x: &Ints, mut f: F) -> bool where F: FnMut(&isize) -> bool {
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let l = x.values.len();
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(0..l).all(|i| f(&x.values[i]))
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}
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pub fn main() {
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let mut ints: Box<_> = box Ints {sum: box 0, values: Vec::new()};
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add_int(&mut *ints, 22);
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add_int(&mut *ints, 44);
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iter_ints(&*ints, |i| {
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println!("isize = {:?}", *i);
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true
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});
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println!("ints={:?}", ints);
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}
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