mirror of https://github.com/rust-lang/rust
33 lines
714 B
Rust
33 lines
714 B
Rust
//@ run-pass
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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::new(Ints {sum: Box::new(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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