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32 lines
620 B
Rust
32 lines
620 B
Rust
//@ run-pass
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#![allow(unused_imports)]
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use std::sync::Mutex;
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use std::thread;
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fn par_for<I, F>(iter: I, f: F)
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where
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I: Iterator,
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I::Item: Send,
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F: Fn(I::Item) + Sync,
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{
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for item in iter {
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f(item)
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}
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}
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fn sum(x: &[i32]) {
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let sum_lengths = Mutex::new(0);
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par_for(x.windows(4), |x| *sum_lengths.lock().unwrap() += x.len());
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assert_eq!(*sum_lengths.lock().unwrap(), (x.len() - 3) * 4);
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}
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fn main() {
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let mut elements = [0; 20];
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// iterators over references into this stack frame
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par_for(elements.iter_mut().enumerate(), |(i, x)| *x = i as i32);
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sum(&elements)
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}
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