44 lines
1.1 KiB
Rust
44 lines
1.1 KiB
Rust
// Copyright 2015 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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//ignore-windows-gnu
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use std::sync::Mutex;
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fn par_for<I, F>(iter: I, f: F)
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where 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| {
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*sum_lengths.lock().unwrap() += x.len()
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});
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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)| {
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*x = i as i32
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});
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sum(&elements)
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}
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