317 lines
7.8 KiB
Rust
317 lines
7.8 KiB
Rust
//! Licensed under the Apache License, Version 2.0
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//! https://www.apache.org/licenses/LICENSE-2.0 or the MIT license
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//! https://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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#![no_std]
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use core::iter;
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use itertools as it;
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use crate::it::Itertools;
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use crate::it::interleave;
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use crate::it::intersperse;
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use crate::it::intersperse_with;
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use crate::it::multizip;
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use crate::it::free::put_back;
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use crate::it::iproduct;
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use crate::it::izip;
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use crate::it::chain;
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#[test]
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fn product2() {
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let s = "αβ";
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let mut prod = iproduct!(s.chars(), 0..2);
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assert!(prod.next() == Some(('α', 0)));
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assert!(prod.next() == Some(('α', 1)));
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assert!(prod.next() == Some(('β', 0)));
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assert!(prod.next() == Some(('β', 1)));
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assert!(prod.next() == None);
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}
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#[test]
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fn product_temporary() {
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for (_x, _y, _z) in iproduct!(
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[0, 1, 2].iter().cloned(),
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[0, 1, 2].iter().cloned(),
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[0, 1, 2].iter().cloned())
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{
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// ok
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}
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}
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#[test]
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fn izip_macro() {
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let mut zip = izip!(2..3);
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assert!(zip.next() == Some(2));
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assert!(zip.next().is_none());
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let mut zip = izip!(0..3, 0..2, 0..2i8);
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for i in 0..2 {
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assert!((i as usize, i, i as i8) == zip.next().unwrap());
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}
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assert!(zip.next().is_none());
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let xs: [isize; 0] = [];
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let mut zip = izip!(0..3, 0..2, 0..2i8, &xs);
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assert!(zip.next().is_none());
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}
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#[test]
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fn izip2() {
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let _zip1: iter::Zip<_, _> = izip!(1.., 2..);
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let _zip2: iter::Zip<_, _> = izip!(1.., 2.., );
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}
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#[test]
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fn izip3() {
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let mut zip: iter::Map<iter::Zip<_, _>, _> = izip!(0..3, 0..2, 0..2i8);
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for i in 0..2 {
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assert!((i as usize, i, i as i8) == zip.next().unwrap());
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}
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assert!(zip.next().is_none());
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}
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#[test]
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fn multizip3() {
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let mut zip = multizip((0..3, 0..2, 0..2i8));
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for i in 0..2 {
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assert!((i as usize, i, i as i8) == zip.next().unwrap());
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}
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assert!(zip.next().is_none());
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let xs: [isize; 0] = [];
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let mut zip = multizip((0..3, 0..2, 0..2i8, xs.iter()));
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assert!(zip.next().is_none());
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for (_, _, _, _, _) in multizip((0..3, 0..2, xs.iter(), &xs, xs.to_vec())) {
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/* test compiles */
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}
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}
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#[test]
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fn chain_macro() {
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let mut chain = chain!(2..3);
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assert!(chain.next() == Some(2));
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assert!(chain.next().is_none());
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let mut chain = chain!(0..2, 2..3, 3..5i8);
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for i in 0..5i8 {
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assert_eq!(Some(i), chain.next());
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}
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assert!(chain.next().is_none());
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let mut chain = chain!();
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assert_eq!(chain.next(), Option::<()>::None);
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}
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#[test]
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fn chain2() {
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let _ = chain!(1.., 2..);
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let _ = chain!(1.., 2.., );
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}
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#[test]
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fn write_to() {
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let xs = [7, 9, 8];
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let mut ys = [0; 5];
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let cnt = ys.iter_mut().set_from(xs.iter().copied());
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assert!(cnt == xs.len());
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assert!(ys == [7, 9, 8, 0, 0]);
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let cnt = ys.iter_mut().set_from(0..10);
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assert!(cnt == ys.len());
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assert!(ys == [0, 1, 2, 3, 4]);
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}
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#[test]
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fn test_interleave() {
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let xs: [u8; 0] = [];
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let ys = [7u8, 9, 8, 10];
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let zs = [2u8, 77];
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let it = interleave(xs.iter(), ys.iter());
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it::assert_equal(it, ys.iter());
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let rs = [7u8, 2, 9, 77, 8, 10];
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let it = interleave(ys.iter(), zs.iter());
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it::assert_equal(it, rs.iter());
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}
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#[test]
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fn test_intersperse() {
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let xs = [1u8, 2, 3];
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let ys = [1u8, 0, 2, 0, 3];
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let it = intersperse(&xs, &0);
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it::assert_equal(it, ys.iter());
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}
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#[test]
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fn test_intersperse_with() {
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let xs = [1u8, 2, 3];
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let ys = [1u8, 10, 2, 10, 3];
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let i = 10;
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let it = intersperse_with(&xs, || &i);
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it::assert_equal(it, ys.iter());
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}
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#[allow(deprecated)]
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#[test]
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fn foreach() {
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let xs = [1i32, 2, 3];
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let mut sum = 0;
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xs.iter().foreach(|elt| sum += *elt);
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assert!(sum == 6);
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}
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#[test]
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fn dropping() {
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let xs = [1, 2, 3];
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let mut it = xs.iter().dropping(2);
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assert_eq!(it.next(), Some(&3));
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assert!(it.next().is_none());
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let mut it = xs.iter().dropping(5);
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assert!(it.next().is_none());
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}
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#[test]
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fn batching() {
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let xs = [0, 1, 2, 1, 3];
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let ys = [(0, 1), (2, 1)];
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// An iterator that gathers elements up in pairs
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let pit = xs
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.iter()
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.cloned()
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.batching(|it| it.next().and_then(|x| it.next().map(|y| (x, y))));
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it::assert_equal(pit, ys.iter().cloned());
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}
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#[test]
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fn test_put_back() {
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let xs = [0, 1, 1, 1, 2, 1, 3, 3];
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let mut pb = put_back(xs.iter().cloned());
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pb.next();
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pb.put_back(1);
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pb.put_back(0);
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it::assert_equal(pb, xs.iter().cloned());
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}
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#[allow(deprecated)]
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#[test]
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fn step() {
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it::assert_equal((0..10).step(1), 0..10);
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it::assert_equal((0..10).step(2), (0..10).filter(|x: &i32| *x % 2 == 0));
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it::assert_equal((0..10).step(10), 0..1);
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}
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#[allow(deprecated)]
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#[test]
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fn merge() {
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it::assert_equal((0..10).step(2).merge((1..10).step(2)), 0..10);
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}
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#[test]
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fn repeatn() {
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let s = "α";
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let mut it = it::repeat_n(s, 3);
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assert_eq!(it.len(), 3);
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assert_eq!(it.next(), Some(s));
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assert_eq!(it.next(), Some(s));
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assert_eq!(it.next(), Some(s));
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assert_eq!(it.next(), None);
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assert_eq!(it.next(), None);
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}
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#[test]
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fn count_clones() {
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// Check that RepeatN only clones N - 1 times.
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use core::cell::Cell;
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#[derive(PartialEq, Debug)]
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struct Foo {
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n: Cell<usize>
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}
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impl Clone for Foo
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{
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fn clone(&self) -> Self
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{
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let n = self.n.get();
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self.n.set(n + 1);
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Foo { n: Cell::new(n + 1) }
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}
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}
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for n in 0..10 {
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let f = Foo{n: Cell::new(0)};
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let it = it::repeat_n(f, n);
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// drain it
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let last = it.last();
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if n == 0 {
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assert_eq!(last, None);
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} else {
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assert_eq!(last, Some(Foo{n: Cell::new(n - 1)}));
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}
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}
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}
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#[test]
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fn part() {
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let mut data = [7, 1, 1, 9, 1, 1, 3];
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let i = it::partition(&mut data, |elt| *elt >= 3);
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assert_eq!(i, 3);
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assert_eq!(data, [7, 3, 9, 1, 1, 1, 1]);
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let i = it::partition(&mut data, |elt| *elt == 1);
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assert_eq!(i, 4);
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assert_eq!(data, [1, 1, 1, 1, 9, 3, 7]);
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let mut data = [1, 2, 3, 4, 5, 6, 7, 8, 9];
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let i = it::partition(&mut data, |elt| *elt % 3 == 0);
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assert_eq!(i, 3);
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assert_eq!(data, [9, 6, 3, 4, 5, 2, 7, 8, 1]);
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}
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#[test]
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fn tree_fold1() {
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for i in 0..100 {
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assert_eq!((0..i).tree_fold1(|x, y| x + y), (0..i).fold1(|x, y| x + y));
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}
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}
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#[test]
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fn exactly_one() {
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assert_eq!((0..10).filter(|&x| x == 2).exactly_one().unwrap(), 2);
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assert!((0..10).filter(|&x| x > 1 && x < 4).exactly_one().unwrap_err().eq(2..4));
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assert!((0..10).filter(|&x| x > 1 && x < 5).exactly_one().unwrap_err().eq(2..5));
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assert!((0..10).filter(|&_| false).exactly_one().unwrap_err().eq(0..0));
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}
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#[test]
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fn at_most_one() {
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assert_eq!((0..10).filter(|&x| x == 2).at_most_one().unwrap(), Some(2));
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assert!((0..10).filter(|&x| x > 1 && x < 4).at_most_one().unwrap_err().eq(2..4));
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assert!((0..10).filter(|&x| x > 1 && x < 5).at_most_one().unwrap_err().eq(2..5));
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assert_eq!((0..10).filter(|&_| false).at_most_one().unwrap(), None);
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}
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#[test]
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fn sum1() {
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let v: &[i32] = &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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assert_eq!(v[..0].iter().cloned().sum1::<i32>(), None);
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assert_eq!(v[1..2].iter().cloned().sum1::<i32>(), Some(1));
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assert_eq!(v[1..3].iter().cloned().sum1::<i32>(), Some(3));
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assert_eq!(v.iter().cloned().sum1::<i32>(), Some(55));
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}
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#[test]
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fn product1() {
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let v: &[i32] = &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
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assert_eq!(v[..0].iter().cloned().product1::<i32>(), None);
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assert_eq!(v[..1].iter().cloned().product1::<i32>(), Some(0));
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assert_eq!(v[1..3].iter().cloned().product1::<i32>(), Some(2));
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assert_eq!(v[1..5].iter().cloned().product1::<i32>(), Some(24));
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}
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