57 lines
1.3 KiB
Rust
57 lines
1.3 KiB
Rust
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// Copyright 2014 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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#![feature(while_let)]
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use std::collections::PriorityQueue;
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fn make_pq() -> PriorityQueue<int> {
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PriorityQueue::from_vec(vec![1i,2,3])
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}
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pub fn main() {
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let mut pq = make_pq();
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let mut sum = 0i;
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while let Some(x) = pq.pop() {
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sum += x;
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}
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assert_eq!(sum, 6i);
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pq = make_pq();
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sum = 0;
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'a: while let Some(x) = pq.pop() {
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sum += x;
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if x == 2 {
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break 'a;
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}
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}
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assert_eq!(sum, 5i);
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pq = make_pq();
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sum = 0;
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'a: while let Some(x) = pq.pop() {
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if x == 3 {
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continue 'a;
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}
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sum += x;
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}
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assert_eq!(sum, 3i);
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let mut pq1 = make_pq();
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sum = 0;
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while let Some(x) = pq1.pop() {
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let mut pq2 = make_pq();
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while let Some(y) = pq2.pop() {
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sum += x * y;
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}
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}
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assert_eq!(sum, 6i + 12 + 18);
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}
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