1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Utilities for slice manipulation
13 //! The `slice` module contains useful code to help work with slice values.
14 //! Slices are a view into a block of memory represented as a pointer and a length.
18 //! let vec = vec!(1i, 2, 3);
19 //! let int_slice = vec.as_slice();
20 //! // coercing an array to a slice
21 //! let str_slice: &[&str] = &["one", "two", "three"];
24 //! Slices are either mutable or shared. The shared slice type is `&[T]`,
25 //! while the mutable slice type is `&mut[T]`. For example, you can mutate the
26 //! block of memory that a mutable slice points to:
29 //! let x: &mut[int] = &mut [1i, 2, 3];
31 //! assert_eq!(x[0], 1);
32 //! assert_eq!(x[1], 7);
33 //! assert_eq!(x[2], 3);
36 //! Here are some of the things this module contains:
40 //! There are several structs that are useful for slices, such as `Iter`, which
41 //! represents iteration over a slice.
45 //! A number of traits add methods that allow you to accomplish tasks
46 //! with slices, the most important being `SliceExt`. Other traits
47 //! apply only to slices of elements satisfying certain bounds (like
50 //! An example is the `slice` method which enables slicing syntax `[a..b]` that
51 //! returns an immutable "view" into a `Vec` or another slice from the index
52 //! interval `[a, b)`:
55 //! #![feature(slicing_syntax)]
57 //! let numbers = [0i, 1i, 2i];
58 //! let last_numbers = numbers[1..3];
59 //! // last_numbers is now &[1i, 2i]
63 //! ## Implementations of other traits
65 //! There are several implementations of common traits for slices. Some examples
69 //! * `Eq`, `Ord` - for immutable slices whose element type are `Eq` or `Ord`.
70 //! * `Hash` - for slices whose element type is `Hash`
74 //! The method `iter()` returns an iteration value for a slice. The iterator
75 //! yields references to the slice's elements, so if the element
76 //! type of the slice is `int`, the element type of the iterator is `&int`.
79 //! let numbers = [0i, 1i, 2i];
80 //! for &x in numbers.iter() {
81 //! println!("{} is a number!", x);
85 //! * `.iter_mut()` returns an iterator that allows modifying each value.
86 //! * Further iterators exist that split, chunk or permute the slice.
88 #![doc(primitive = "slice")]
90 use alloc::boxed::Box;
91 use core::borrow::{BorrowFrom, BorrowFromMut, ToOwned};
92 use core::clone::Clone;
93 use core::cmp::Ordering::{mod, Greater, Less};
94 use core::cmp::{mod, Ord, PartialEq};
95 use core::iter::{Iterator, IteratorExt, IteratorCloneExt};
96 use core::iter::{range, range_step, MultiplicativeIterator};
97 use core::kinds::Sized;
98 use core::mem::size_of;
100 use core::ops::{FnMut, SliceMut};
101 use core::option::Option::{mod, Some, None};
102 use core::ptr::PtrExt;
104 use core::result::Result;
105 use core::slice as core_slice;
106 use self::Direction::*;
110 pub use core::slice::{Chunks, AsSlice, Windows};
111 pub use core::slice::{Iter, IterMut};
112 pub use core::slice::{IntSliceExt, SplitMut, ChunksMut, Split};
113 pub use core::slice::{SplitN, RSplitN, SplitNMut, RSplitNMut};
114 pub use core::slice::{bytes, mut_ref_slice, ref_slice};
115 pub use core::slice::{from_raw_buf, from_raw_mut_buf};
117 #[deprecated = "use Iter instead"]
118 pub type Items<'a, T:'a> = Iter<'a, T>;
120 #[deprecated = "use IterMut instead"]
121 pub type MutItems<'a, T:'a> = IterMut<'a, T>;
123 ////////////////////////////////////////////////////////////////////////////////
124 // Basic slice extension methods
125 ////////////////////////////////////////////////////////////////////////////////
127 /// Allocating extension methods for slices.
128 #[unstable = "needs associated types, may merge with other traits"]
129 pub trait SliceExt for Sized? {
132 /// Sorts the slice, in place, using `compare` to compare
135 /// This sort is `O(n log n)` worst-case and stable, but allocates
136 /// approximately `2 * n`, where `n` is the length of `self`.
141 /// let mut v = [5i, 4, 1, 3, 2];
142 /// v.sort_by(|a, b| a.cmp(b));
143 /// assert!(v == [1, 2, 3, 4, 5]);
145 /// // reverse sorting
146 /// v.sort_by(|a, b| b.cmp(a));
147 /// assert!(v == [5, 4, 3, 2, 1]);
150 fn sort_by<F>(&mut self, compare: F) where F: FnMut(&Self::Item, &Self::Item) -> Ordering;
152 /// Consumes `src` and moves as many elements as it can into `self`
153 /// from the range [start,end).
155 /// Returns the number of elements copied (the shorter of `self.len()`
156 /// and `end - start`).
160 /// * src - A mutable vector of `T`
161 /// * start - The index into `src` to start copying from
162 /// * end - The index into `src` to stop copying from
167 /// let mut a = [1i, 2, 3, 4, 5];
168 /// let b = vec![6i, 7, 8];
169 /// let num_moved = a.move_from(b, 0, 3);
170 /// assert_eq!(num_moved, 3);
171 /// assert!(a == [6i, 7, 8, 4, 5]);
173 #[experimental = "uncertain about this API approach"]
174 fn move_from(&mut self, src: Vec<Self::Item>, start: uint, end: uint) -> uint;
176 /// Returns a subslice spanning the interval [`start`, `end`).
178 /// Panics when the end of the new slice lies beyond the end of the
179 /// original slice (i.e. when `end > self.len()`) or when `start > end`.
181 /// Slicing with `start` equal to `end` yields an empty slice.
182 #[experimental = "will be replaced by slice syntax"]
183 fn slice(&self, start: uint, end: uint) -> &[Self::Item];
185 /// Returns a subslice from `start` to the end of the slice.
187 /// Panics when `start` is strictly greater than the length of the original slice.
189 /// Slicing from `self.len()` yields an empty slice.
190 #[experimental = "will be replaced by slice syntax"]
191 fn slice_from(&self, start: uint) -> &[Self::Item];
193 /// Returns a subslice from the start of the slice to `end`.
195 /// Panics when `end` is strictly greater than the length of the original slice.
197 /// Slicing to `0` yields an empty slice.
198 #[experimental = "will be replaced by slice syntax"]
199 fn slice_to(&self, end: uint) -> &[Self::Item];
201 /// Divides one slice into two at an index.
203 /// The first will contain all indices from `[0, mid)` (excluding
204 /// the index `mid` itself) and the second will contain all
205 /// indices from `[mid, len)` (excluding the index `len` itself).
207 /// Panics if `mid > len`.
209 fn split_at(&self, mid: uint) -> (&[Self::Item], &[Self::Item]);
211 /// Returns an iterator over the slice
213 fn iter(&self) -> Iter<Self::Item>;
215 /// Returns an iterator over subslices separated by elements that match
216 /// `pred`. The matched element is not contained in the subslices.
218 fn split<F>(&self, pred: F) -> Split<Self::Item, F>
219 where F: FnMut(&Self::Item) -> bool;
221 /// Returns an iterator over subslices separated by elements that match
222 /// `pred`, limited to splitting at most `n` times. The matched element is
223 /// not contained in the subslices.
225 fn splitn<F>(&self, n: uint, pred: F) -> SplitN<Self::Item, F>
226 where F: FnMut(&Self::Item) -> bool;
228 /// Returns an iterator over subslices separated by elements that match
229 /// `pred` limited to splitting at most `n` times. This starts at the end of
230 /// the slice and works backwards. The matched element is not contained in
233 fn rsplitn<F>(&self, n: uint, pred: F) -> RSplitN<Self::Item, F>
234 where F: FnMut(&Self::Item) -> bool;
236 /// Returns an iterator over all contiguous windows of length
237 /// `size`. The windows overlap. If the slice is shorter than
238 /// `size`, the iterator returns no values.
242 /// Panics if `size` is 0.
246 /// Print the adjacent pairs of a slice (i.e. `[1,2]`, `[2,3]`,
250 /// let v = &[1i, 2, 3, 4];
251 /// for win in v.windows(2) {
252 /// println!("{}", win);
256 fn windows(&self, size: uint) -> Windows<Self::Item>;
258 /// Returns an iterator over `size` elements of the slice at a
259 /// time. The chunks do not overlap. If `size` does not divide the
260 /// length of the slice, then the last chunk will not have length
265 /// Panics if `size` is 0.
269 /// Print the slice two elements at a time (i.e. `[1,2]`,
273 /// let v = &[1i, 2, 3, 4, 5];
274 /// for win in v.chunks(2) {
275 /// println!("{}", win);
279 fn chunks(&self, size: uint) -> Chunks<Self::Item>;
281 /// Returns the element of a slice at the given index, or `None` if the
282 /// index is out of bounds.
284 fn get(&self, index: uint) -> Option<&Self::Item>;
286 /// Returns the first element of a slice, or `None` if it is empty.
288 fn first(&self) -> Option<&Self::Item>;
290 /// Deprecated: renamed to `first`.
291 #[deprecated = "renamed to `first`"]
292 fn head(&self) -> Option<&Self::Item> { self.first() }
294 /// Returns all but the first element of a slice.
295 #[experimental = "likely to be renamed"]
296 fn tail(&self) -> &[Self::Item];
298 /// Returns all but the last element of a slice.
299 #[experimental = "likely to be renamed"]
300 fn init(&self) -> &[Self::Item];
302 /// Returns the last element of a slice, or `None` if it is empty.
304 fn last(&self) -> Option<&Self::Item>;
306 /// Returns a pointer to the element at the given index, without doing
309 unsafe fn get_unchecked(&self, index: uint) -> &Self::Item;
311 /// Deprecated: renamed to `get_unchecked`.
312 #[deprecated = "renamed to get_unchecked"]
313 unsafe fn unsafe_get(&self, index: uint) -> &Self::Item {
314 self.get_unchecked(index)
317 /// Returns an unsafe pointer to the slice's buffer
319 /// The caller must ensure that the slice outlives the pointer this
320 /// function returns, or else it will end up pointing to garbage.
322 /// Modifying the slice may cause its buffer to be reallocated, which
323 /// would also make any pointers to it invalid.
325 fn as_ptr(&self) -> *const Self::Item;
327 /// Binary search a sorted slice with a comparator function.
329 /// The comparator function should implement an order consistent
330 /// with the sort order of the underlying slice, returning an
331 /// order code that indicates whether its argument is `Less`,
332 /// `Equal` or `Greater` the desired target.
334 /// If a matching value is found then returns `Ok`, containing
335 /// the index for the matched element; if no match is found then
336 /// `Err` is returned, containing the index where a matching
337 /// element could be inserted while maintaining sorted order.
341 /// Looks up a series of four elements. The first is found, with a
342 /// uniquely determined position; the second and third are not
343 /// found; the fourth could match any position in `[1,4]`.
346 /// let s = [0i, 1, 1, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55];
347 /// let s = s.as_slice();
350 /// assert_eq!(s.binary_search_by(|probe| probe.cmp(&seek)), Ok(9));
352 /// assert_eq!(s.binary_search_by(|probe| probe.cmp(&seek)), Err(7));
354 /// assert_eq!(s.binary_search_by(|probe| probe.cmp(&seek)), Err(13));
356 /// let r = s.binary_search_by(|probe| probe.cmp(&seek));
357 /// assert!(match r { Ok(1...4) => true, _ => false, });
360 fn binary_search_by<F>(&self, f: F) -> Result<uint, uint> where
361 F: FnMut(&Self::Item) -> Ordering;
363 /// Return the number of elements in the slice
368 /// let a = [1i, 2, 3];
369 /// assert_eq!(a.len(), 3);
372 fn len(&self) -> uint;
374 /// Returns true if the slice has a length of 0
379 /// let a = [1i, 2, 3];
380 /// assert!(!a.is_empty());
384 fn is_empty(&self) -> bool { self.len() == 0 }
385 /// Returns a mutable reference to the element at the given index,
386 /// or `None` if the index is out of bounds
388 fn get_mut(&mut self, index: uint) -> Option<&mut Self::Item>;
390 /// Work with `self` as a mut slice.
391 /// Primarily intended for getting a &mut [T] from a [T; N].
393 fn as_mut_slice(&mut self) -> &mut [Self::Item];
395 /// Returns a mutable subslice spanning the interval [`start`, `end`).
397 /// Panics when the end of the new slice lies beyond the end of the
398 /// original slice (i.e. when `end > self.len()`) or when `start > end`.
400 /// Slicing with `start` equal to `end` yields an empty slice.
401 #[experimental = "will be replaced by slice syntax"]
402 fn slice_mut(&mut self, start: uint, end: uint) -> &mut [Self::Item];
404 /// Returns a mutable subslice from `start` to the end of the slice.
406 /// Panics when `start` is strictly greater than the length of the original slice.
408 /// Slicing from `self.len()` yields an empty slice.
409 #[experimental = "will be replaced by slice syntax"]
410 fn slice_from_mut(&mut self, start: uint) -> &mut [Self::Item];
412 /// Returns a mutable subslice from the start of the slice to `end`.
414 /// Panics when `end` is strictly greater than the length of the original slice.
416 /// Slicing to `0` yields an empty slice.
417 #[experimental = "will be replaced by slice syntax"]
418 fn slice_to_mut(&mut self, end: uint) -> &mut [Self::Item];
420 /// Returns an iterator that allows modifying each value
422 fn iter_mut(&mut self) -> IterMut<Self::Item>;
424 /// Returns a mutable pointer to the first element of a slice, or `None` if it is empty
426 fn first_mut(&mut self) -> Option<&mut Self::Item>;
428 /// Depreated: renamed to `first_mut`.
429 #[deprecated = "renamed to first_mut"]
430 fn head_mut(&mut self) -> Option<&mut Self::Item> {
434 /// Returns all but the first element of a mutable slice
435 #[experimental = "likely to be renamed or removed"]
436 fn tail_mut(&mut self) -> &mut [Self::Item];
438 /// Returns all but the last element of a mutable slice
439 #[experimental = "likely to be renamed or removed"]
440 fn init_mut(&mut self) -> &mut [Self::Item];
442 /// Returns a mutable pointer to the last item in the slice.
444 fn last_mut(&mut self) -> Option<&mut Self::Item>;
446 /// Returns an iterator over mutable subslices separated by elements that
447 /// match `pred`. The matched element is not contained in the subslices.
449 fn split_mut<F>(&mut self, pred: F) -> SplitMut<Self::Item, F>
450 where F: FnMut(&Self::Item) -> bool;
452 /// Returns an iterator over subslices separated by elements that match
453 /// `pred`, limited to splitting at most `n` times. The matched element is
454 /// not contained in the subslices.
456 fn splitn_mut<F>(&mut self, n: uint, pred: F) -> SplitNMut<Self::Item, F>
457 where F: FnMut(&Self::Item) -> bool;
459 /// Returns an iterator over subslices separated by elements that match
460 /// `pred` limited to splitting at most `n` times. This starts at the end of
461 /// the slice and works backwards. The matched element is not contained in
464 fn rsplitn_mut<F>(&mut self, n: uint, pred: F) -> RSplitNMut<Self::Item, F>
465 where F: FnMut(&Self::Item) -> bool;
467 /// Returns an iterator over `chunk_size` elements of the slice at a time.
468 /// The chunks are mutable and do not overlap. If `chunk_size` does
469 /// not divide the length of the slice, then the last chunk will not
470 /// have length `chunk_size`.
474 /// Panics if `chunk_size` is 0.
476 fn chunks_mut(&mut self, chunk_size: uint) -> ChunksMut<Self::Item>;
478 /// Swaps two elements in a slice.
482 /// * a - The index of the first element
483 /// * b - The index of the second element
487 /// Panics if `a` or `b` are out of bounds.
492 /// let mut v = ["a", "b", "c", "d"];
494 /// assert!(v == ["a", "d", "c", "b"]);
497 fn swap(&mut self, a: uint, b: uint);
499 /// Divides one `&mut` into two at an index.
501 /// The first will contain all indices from `[0, mid)` (excluding
502 /// the index `mid` itself) and the second will contain all
503 /// indices from `[mid, len)` (excluding the index `len` itself).
507 /// Panics if `mid > len`.
512 /// let mut v = [1i, 2, 3, 4, 5, 6];
514 /// // scoped to restrict the lifetime of the borrows
516 /// let (left, right) = v.split_at_mut(0);
517 /// assert!(left == []);
518 /// assert!(right == [1i, 2, 3, 4, 5, 6]);
522 /// let (left, right) = v.split_at_mut(2);
523 /// assert!(left == [1i, 2]);
524 /// assert!(right == [3i, 4, 5, 6]);
528 /// let (left, right) = v.split_at_mut(6);
529 /// assert!(left == [1i, 2, 3, 4, 5, 6]);
530 /// assert!(right == []);
534 fn split_at_mut(&mut self, mid: uint) -> (&mut [Self::Item], &mut [Self::Item]);
536 /// Reverse the order of elements in a slice, in place.
541 /// let mut v = [1i, 2, 3];
543 /// assert!(v == [3i, 2, 1]);
546 fn reverse(&mut self);
548 /// Returns an unsafe mutable pointer to the element in index
550 unsafe fn get_unchecked_mut(&mut self, index: uint) -> &mut Self::Item;
552 /// Deprecated: renamed to `get_unchecked_mut`.
553 #[deprecated = "renamed to get_unchecked_mut"]
554 unsafe fn unchecked_mut(&mut self, index: uint) -> &mut Self::Item {
555 self.get_unchecked_mut(index)
558 /// Return an unsafe mutable pointer to the slice's buffer.
560 /// The caller must ensure that the slice outlives the pointer this
561 /// function returns, or else it will end up pointing to garbage.
563 /// Modifying the slice may cause its buffer to be reallocated, which
564 /// would also make any pointers to it invalid.
567 fn as_mut_ptr(&mut self) -> *mut Self::Item;
569 /// Copies `self` into a new `Vec`.
571 fn to_vec(&self) -> Vec<Self::Item> where Self::Item: Clone;
573 /// Deprecated: use `iter().cloned().partition(f)` instead.
574 #[deprecated = "use iter().cloned().partition(f) instead"]
575 fn partitioned<F>(&self, f: F) -> (Vec<Self::Item>, Vec<Self::Item>) where
577 F: FnMut(&Self::Item) -> bool;
579 /// Creates an iterator that yields every possible permutation of the
580 /// vector in succession.
585 /// let v = [1i, 2, 3];
586 /// let mut perms = v.permutations();
589 /// println!("{}", p);
593 /// Iterating through permutations one by one.
596 /// let v = [1i, 2, 3];
597 /// let mut perms = v.permutations();
599 /// assert_eq!(Some(vec![1i, 2, 3]), perms.next());
600 /// assert_eq!(Some(vec![1i, 3, 2]), perms.next());
601 /// assert_eq!(Some(vec![3i, 1, 2]), perms.next());
604 fn permutations(&self) -> Permutations<Self::Item> where Self::Item: Clone;
606 /// Copies as many elements from `src` as it can into `self` (the
607 /// shorter of `self.len()` and `src.len()`). Returns the number
608 /// of elements copied.
613 /// let mut dst = [0i, 0, 0];
614 /// let src = [1i, 2];
616 /// assert!(dst.clone_from_slice(&src) == 2);
617 /// assert!(dst == [1, 2, 0]);
619 /// let src2 = [3i, 4, 5, 6];
620 /// assert!(dst.clone_from_slice(&src2) == 3);
621 /// assert!(dst == [3i, 4, 5]);
624 fn clone_from_slice(&mut self, &[Self::Item]) -> uint where Self::Item: Clone;
626 /// Sorts the slice, in place.
628 /// This is equivalent to `self.sort_by(|a, b| a.cmp(b))`.
633 /// let mut v = [-5i, 4, 1, -3, 2];
636 /// assert!(v == [-5i, -3, 1, 2, 4]);
639 fn sort(&mut self) where Self::Item: Ord;
641 /// Binary search a sorted slice for a given element.
643 /// If the value is found then `Ok` is returned, containing the
644 /// index of the matching element; if the value is not found then
645 /// `Err` is returned, containing the index where a matching
646 /// element could be inserted while maintaining sorted order.
650 /// Looks up a series of four elements. The first is found, with a
651 /// uniquely determined position; the second and third are not
652 /// found; the fourth could match any position in `[1,4]`.
655 /// let s = [0i, 1, 1, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55];
656 /// let s = s.as_slice();
658 /// assert_eq!(s.binary_search(&13), Ok(9));
659 /// assert_eq!(s.binary_search(&4), Err(7));
660 /// assert_eq!(s.binary_search(&100), Err(13));
661 /// let r = s.binary_search(&1);
662 /// assert!(match r { Ok(1...4) => true, _ => false, });
665 fn binary_search(&self, x: &Self::Item) -> Result<uint, uint> where Self::Item: Ord;
667 /// Deprecated: use `binary_search` instead.
668 #[deprecated = "use binary_search instead"]
669 fn binary_search_elem(&self, x: &Self::Item) -> Result<uint, uint> where Self::Item: Ord {
670 self.binary_search(x)
673 /// Mutates the slice to the next lexicographic permutation.
675 /// Returns `true` if successful and `false` if the slice is at the
676 /// last-ordered permutation.
681 /// let v: &mut [_] = &mut [0i, 1, 2];
682 /// v.next_permutation();
683 /// let b: &mut [_] = &mut [0i, 2, 1];
685 /// v.next_permutation();
686 /// let b: &mut [_] = &mut [1i, 0, 2];
689 #[unstable = "uncertain if this merits inclusion in std"]
690 fn next_permutation(&mut self) -> bool where Self::Item: Ord;
692 /// Mutates the slice to the previous lexicographic permutation.
694 /// Returns `true` if successful and `false` if the slice is at the
695 /// first-ordered permutation.
700 /// let v: &mut [_] = &mut [1i, 0, 2];
701 /// v.prev_permutation();
702 /// let b: &mut [_] = &mut [0i, 2, 1];
704 /// v.prev_permutation();
705 /// let b: &mut [_] = &mut [0i, 1, 2];
708 #[unstable = "uncertain if this merits inclusion in std"]
709 fn prev_permutation(&mut self) -> bool where Self::Item: Ord;
711 /// Find the first index containing a matching value.
713 fn position_elem(&self, t: &Self::Item) -> Option<uint> where Self::Item: PartialEq;
715 /// Find the last index containing a matching value.
717 fn rposition_elem(&self, t: &Self::Item) -> Option<uint> where Self::Item: PartialEq;
719 /// Return true if the slice contains an element with the given value.
721 fn contains(&self, x: &Self::Item) -> bool where Self::Item: PartialEq;
723 /// Returns true if `needle` is a prefix of the slice.
725 fn starts_with(&self, needle: &[Self::Item]) -> bool where Self::Item: PartialEq;
727 /// Returns true if `needle` is a suffix of the slice.
729 fn ends_with(&self, needle: &[Self::Item]) -> bool where Self::Item: PartialEq;
731 /// Convert `self` into a vector without clones or allocation.
733 fn into_vec(self: Box<Self>) -> Vec<Self::Item>;
736 #[unstable = "trait is unstable"]
737 impl<T> SliceExt for [T] {
741 fn sort_by<F>(&mut self, compare: F) where F: FnMut(&T, &T) -> Ordering {
742 merge_sort(self, compare)
746 fn move_from(&mut self, mut src: Vec<T>, start: uint, end: uint) -> uint {
747 for (a, b) in self.iter_mut().zip(src.slice_mut(start, end).iter_mut()) {
750 cmp::min(self.len(), end-start)
754 fn slice<'a>(&'a self, start: uint, end: uint) -> &'a [T] {
755 core_slice::SliceExt::slice(self, start, end)
759 fn slice_from<'a>(&'a self, start: uint) -> &'a [T] {
760 core_slice::SliceExt::slice_from(self, start)
764 fn slice_to<'a>(&'a self, end: uint) -> &'a [T] {
765 core_slice::SliceExt::slice_to(self, end)
769 fn split_at<'a>(&'a self, mid: uint) -> (&'a [T], &'a [T]) {
770 core_slice::SliceExt::split_at(self, mid)
774 fn iter<'a>(&'a self) -> Iter<'a, T> {
775 core_slice::SliceExt::iter(self)
779 fn split<F>(&self, pred: F) -> Split<T, F>
780 where F: FnMut(&T) -> bool {
781 core_slice::SliceExt::split(self, pred)
785 fn splitn<F>(&self, n: uint, pred: F) -> SplitN<T, F>
786 where F: FnMut(&T) -> bool {
787 core_slice::SliceExt::splitn(self, n, pred)
791 fn rsplitn<F>(&self, n: uint, pred: F) -> RSplitN<T, F>
792 where F: FnMut(&T) -> bool {
793 core_slice::SliceExt::rsplitn(self, n, pred)
797 fn windows<'a>(&'a self, size: uint) -> Windows<'a, T> {
798 core_slice::SliceExt::windows(self, size)
802 fn chunks<'a>(&'a self, size: uint) -> Chunks<'a, T> {
803 core_slice::SliceExt::chunks(self, size)
807 fn get<'a>(&'a self, index: uint) -> Option<&'a T> {
808 core_slice::SliceExt::get(self, index)
812 fn first<'a>(&'a self) -> Option<&'a T> {
813 core_slice::SliceExt::first(self)
817 fn tail<'a>(&'a self) -> &'a [T] {
818 core_slice::SliceExt::tail(self)
822 fn init<'a>(&'a self) -> &'a [T] {
823 core_slice::SliceExt::init(self)
827 fn last<'a>(&'a self) -> Option<&'a T> {
828 core_slice::SliceExt::last(self)
832 unsafe fn get_unchecked<'a>(&'a self, index: uint) -> &'a T {
833 core_slice::SliceExt::get_unchecked(self, index)
837 fn as_ptr(&self) -> *const T {
838 core_slice::SliceExt::as_ptr(self)
842 fn binary_search_by<F>(&self, f: F) -> Result<uint, uint>
843 where F: FnMut(&T) -> Ordering {
844 core_slice::SliceExt::binary_search_by(self, f)
848 fn len(&self) -> uint {
849 core_slice::SliceExt::len(self)
853 fn is_empty(&self) -> bool {
854 core_slice::SliceExt::is_empty(self)
858 fn get_mut<'a>(&'a mut self, index: uint) -> Option<&'a mut T> {
859 core_slice::SliceExt::get_mut(self, index)
863 fn as_mut_slice<'a>(&'a mut self) -> &'a mut [T] {
864 core_slice::SliceExt::as_mut_slice(self)
868 fn slice_mut<'a>(&'a mut self, start: uint, end: uint) -> &'a mut [T] {
869 core_slice::SliceExt::slice_mut(self, start, end)
873 fn slice_from_mut<'a>(&'a mut self, start: uint) -> &'a mut [T] {
874 core_slice::SliceExt::slice_from_mut(self, start)
878 fn slice_to_mut<'a>(&'a mut self, end: uint) -> &'a mut [T] {
879 core_slice::SliceExt::slice_to_mut(self, end)
883 fn iter_mut<'a>(&'a mut self) -> IterMut<'a, T> {
884 core_slice::SliceExt::iter_mut(self)
888 fn first_mut<'a>(&'a mut self) -> Option<&'a mut T> {
889 core_slice::SliceExt::first_mut(self)
893 fn tail_mut<'a>(&'a mut self) -> &'a mut [T] {
894 core_slice::SliceExt::tail_mut(self)
898 fn init_mut<'a>(&'a mut self) -> &'a mut [T] {
899 core_slice::SliceExt::init_mut(self)
903 fn last_mut<'a>(&'a mut self) -> Option<&'a mut T> {
904 core_slice::SliceExt::last_mut(self)
908 fn split_mut<F>(&mut self, pred: F) -> SplitMut<T, F>
909 where F: FnMut(&T) -> bool {
910 core_slice::SliceExt::split_mut(self, pred)
914 fn splitn_mut<F>(&mut self, n: uint, pred: F) -> SplitNMut<T, F>
915 where F: FnMut(&T) -> bool {
916 core_slice::SliceExt::splitn_mut(self, n, pred)
920 fn rsplitn_mut<F>(&mut self, n: uint, pred: F) -> RSplitNMut<T, F>
921 where F: FnMut(&T) -> bool {
922 core_slice::SliceExt::rsplitn_mut(self, n, pred)
926 fn chunks_mut<'a>(&'a mut self, chunk_size: uint) -> ChunksMut<'a, T> {
927 core_slice::SliceExt::chunks_mut(self, chunk_size)
931 fn swap(&mut self, a: uint, b: uint) {
932 core_slice::SliceExt::swap(self, a, b)
936 fn split_at_mut<'a>(&'a mut self, mid: uint) -> (&'a mut [T], &'a mut [T]) {
937 core_slice::SliceExt::split_at_mut(self, mid)
941 fn reverse(&mut self) {
942 core_slice::SliceExt::reverse(self)
946 unsafe fn get_unchecked_mut<'a>(&'a mut self, index: uint) -> &'a mut T {
947 core_slice::SliceExt::get_unchecked_mut(self, index)
951 fn as_mut_ptr(&mut self) -> *mut T {
952 core_slice::SliceExt::as_mut_ptr(self)
955 /// Returns a copy of `v`.
957 fn to_vec(&self) -> Vec<T> where T: Clone {
958 let mut vector = Vec::with_capacity(self.len());
959 vector.push_all(self);
965 fn partitioned<F>(&self, f: F) -> (Vec<T>, Vec<T>) where F: FnMut(&T) -> bool, T: Clone {
966 self.iter().cloned().partition(f)
969 /// Returns an iterator over all permutations of a vector.
970 fn permutations(&self) -> Permutations<T> where T: Clone {
972 swaps: ElementSwaps::new(self.len()),
977 fn clone_from_slice(&mut self, src: &[T]) -> uint where T: Clone {
978 core_slice::SliceExt::clone_from_slice(self, src)
982 fn sort(&mut self) where T: Ord {
983 self.sort_by(|a, b| a.cmp(b))
986 fn binary_search(&self, x: &T) -> Result<uint, uint> where T: Ord {
987 core_slice::SliceExt::binary_search(self, x)
990 fn next_permutation(&mut self) -> bool where T: Ord {
991 core_slice::SliceExt::next_permutation(self)
994 fn prev_permutation(&mut self) -> bool where T: Ord {
995 core_slice::SliceExt::prev_permutation(self)
998 fn position_elem(&self, t: &T) -> Option<uint> where T: PartialEq {
999 core_slice::SliceExt::position_elem(self, t)
1002 fn rposition_elem(&self, t: &T) -> Option<uint> where T: PartialEq {
1003 core_slice::SliceExt::rposition_elem(self, t)
1006 fn contains(&self, x: &T) -> bool where T: PartialEq {
1007 core_slice::SliceExt::contains(self, x)
1010 fn starts_with(&self, needle: &[T]) -> bool where T: PartialEq {
1011 core_slice::SliceExt::starts_with(self, needle)
1014 fn ends_with(&self, needle: &[T]) -> bool where T: PartialEq {
1015 core_slice::SliceExt::ends_with(self, needle)
1018 fn into_vec(mut self: Box<Self>) -> Vec<T> {
1020 let xs = Vec::from_raw_parts(self.as_mut_ptr(), self.len(), self.len());
1027 ////////////////////////////////////////////////////////////////////////////////
1028 // Extension traits for slices over specifc kinds of data
1029 ////////////////////////////////////////////////////////////////////////////////
1030 #[unstable = "U should be an associated type"]
1031 /// An extension trait for concatenating slices
1032 pub trait SliceConcatExt<Sized? T, U> for Sized? {
1033 /// Flattens a slice of `T` into a single value `U`.
1035 fn concat(&self) -> U;
1037 #[deprecated = "renamed to concat"]
1038 fn concat_vec(&self) -> U {
1042 /// Flattens a slice of `T` into a single value `U`, placing a
1043 /// given seperator between each.
1045 fn connect(&self, sep: &T) -> U;
1047 #[deprecated = "renamed to connect"]
1048 fn connect_vec(&self, sep: &T) -> U {
1053 impl<T: Clone, V: AsSlice<T>> SliceConcatExt<T, Vec<T>> for [V] {
1054 fn concat(&self) -> Vec<T> {
1055 let size = self.iter().fold(0u, |acc, v| acc + v.as_slice().len());
1056 let mut result = Vec::with_capacity(size);
1057 for v in self.iter() {
1058 result.push_all(v.as_slice())
1063 fn connect(&self, sep: &T) -> Vec<T> {
1064 let size = self.iter().fold(0u, |acc, v| acc + v.as_slice().len());
1065 let mut result = Vec::with_capacity(size + self.len());
1066 let mut first = true;
1067 for v in self.iter() {
1068 if first { first = false } else { result.push(sep.clone()) }
1069 result.push_all(v.as_slice())
1075 /// An iterator that yields the element swaps needed to produce
1076 /// a sequence of all possible permutations for an indexed sequence of
1077 /// elements. Each permutation is only a single swap apart.
1079 /// The Steinhaus-Johnson-Trotter algorithm is used.
1081 /// Generates even and odd permutations alternately.
1083 /// The last generated swap is always (0, 1), and it returns the
1084 /// sequence to its initial order.
1087 pub struct ElementSwaps {
1088 sdir: Vec<SizeDirection>,
1089 /// If `true`, emit the last swap that returns the sequence to initial
1096 /// Creates an `ElementSwaps` iterator for a sequence of `length` elements.
1098 pub fn new(length: uint) -> ElementSwaps {
1099 // Initialize `sdir` with a direction that position should move in
1100 // (all negative at the beginning) and the `size` of the
1101 // element (equal to the original index).
1104 sdir: range(0, length).map(|i| SizeDirection{ size: i, dir: Neg }).collect(),
1110 ////////////////////////////////////////////////////////////////////////////////
1111 // Standard trait implementations for slices
1112 ////////////////////////////////////////////////////////////////////////////////
1114 #[unstable = "trait is unstable"]
1115 impl<T> BorrowFrom<Vec<T>> for [T] {
1116 fn borrow_from(owned: &Vec<T>) -> &[T] { owned[] }
1119 #[unstable = "trait is unstable"]
1120 impl<T> BorrowFromMut<Vec<T>> for [T] {
1121 fn borrow_from_mut(owned: &mut Vec<T>) -> &mut [T] { owned.as_mut_slice_() }
1124 #[unstable = "trait is unstable"]
1125 impl<T: Clone> ToOwned<Vec<T>> for [T] {
1126 fn to_owned(&self) -> Vec<T> { self.to_vec() }
1129 ////////////////////////////////////////////////////////////////////////////////
1131 ////////////////////////////////////////////////////////////////////////////////
1133 #[deriving(Copy, Clone)]
1134 enum Direction { Pos, Neg }
1136 /// An `Index` and `Direction` together.
1137 #[deriving(Copy, Clone)]
1138 struct SizeDirection {
1143 impl Iterator for ElementSwaps {
1144 type Item = (uint, uint);
1147 fn next(&mut self) -> Option<(uint, uint)> {
1148 fn new_pos(i: uint, s: Direction) -> uint {
1149 i + match s { Pos => 1, Neg => -1 }
1152 // Find the index of the largest mobile element:
1153 // The direction should point into the vector, and the
1154 // swap should be with a smaller `size` element.
1155 let max = self.sdir.iter().map(|&x| x).enumerate()
1157 new_pos(i, sd.dir) < self.sdir.len() &&
1158 self.sdir[new_pos(i, sd.dir)].size < sd.size)
1159 .max_by(|&(_, sd)| sd.size);
1162 let j = new_pos(i, sd.dir);
1163 self.sdir.swap(i, j);
1165 // Swap the direction of each larger SizeDirection
1166 for x in self.sdir.iter_mut() {
1167 if x.size > sd.size {
1168 x.dir = match x.dir { Pos => Neg, Neg => Pos };
1171 self.swaps_made += 1;
1174 None => if self.emit_reset {
1175 self.emit_reset = false;
1176 if self.sdir.len() > 1 {
1178 self.swaps_made += 1;
1181 // Vector is of the form [] or [x], and the only permutation is itself
1182 self.swaps_made += 1;
1190 fn size_hint(&self) -> (uint, Option<uint>) {
1191 // For a vector of size n, there are exactly n! permutations.
1192 let n = range(2, self.sdir.len() + 1).product();
1193 (n - self.swaps_made, Some(n - self.swaps_made))
1197 /// An iterator that uses `ElementSwaps` to iterate through
1198 /// all possible permutations of a vector.
1200 /// The first iteration yields a clone of the vector as it is,
1201 /// then each successive element is the vector with one
1204 /// Generates even and odd permutations alternately.
1206 pub struct Permutations<T> {
1207 swaps: ElementSwaps,
1211 #[unstable = "trait is unstable"]
1212 impl<T: Clone> Iterator for Permutations<T> {
1216 fn next(&mut self) -> Option<Vec<T>> {
1217 match self.swaps.next() {
1219 Some((0,0)) => Some(self.v.clone()),
1221 let elt = self.v.clone();
1229 fn size_hint(&self) -> (uint, Option<uint>) {
1230 self.swaps.size_hint()
1234 ////////////////////////////////////////////////////////////////////////////////
1236 ////////////////////////////////////////////////////////////////////////////////
1238 fn insertion_sort<T, F>(v: &mut [T], mut compare: F) where F: FnMut(&T, &T) -> Ordering {
1239 let len = v.len() as int;
1240 let buf_v = v.as_mut_ptr();
1243 for i in range(1, len) {
1244 // j satisfies: 0 <= j <= i;
1247 // `i` is in bounds.
1248 let read_ptr = buf_v.offset(i) as *const T;
1250 // find where to insert, we need to do strict <,
1251 // rather than <=, to maintain stability.
1253 // 0 <= j - 1 < len, so .offset(j - 1) is in bounds.
1255 compare(&*read_ptr, &*buf_v.offset(j - 1)) == Less {
1259 // shift everything to the right, to make space to
1260 // insert this value.
1262 // j + 1 could be `len` (for the last `i`), but in
1263 // that case, `i == j` so we don't copy. The
1264 // `.offset(j)` is always in bounds.
1267 let tmp = ptr::read(read_ptr);
1268 ptr::copy_memory(buf_v.offset(j + 1),
1271 ptr::copy_nonoverlapping_memory(buf_v.offset(j),
1280 fn merge_sort<T, F>(v: &mut [T], mut compare: F) where F: FnMut(&T, &T) -> Ordering {
1281 // warning: this wildly uses unsafe.
1282 static BASE_INSERTION: uint = 32;
1283 static LARGE_INSERTION: uint = 16;
1285 // FIXME #12092: smaller insertion runs seems to make sorting
1286 // vectors of large elements a little faster on some platforms,
1287 // but hasn't been tested/tuned extensively
1288 let insertion = if size_of::<T>() <= 16 {
1296 // short vectors get sorted in-place via insertion sort to avoid allocations
1297 if len <= insertion {
1298 insertion_sort(v, compare);
1302 // allocate some memory to use as scratch memory, we keep the
1303 // length 0 so we can keep shallow copies of the contents of `v`
1304 // without risking the dtors running on an object twice if
1305 // `compare` panics.
1306 let mut working_space = Vec::with_capacity(2 * len);
1307 // these both are buffers of length `len`.
1308 let mut buf_dat = working_space.as_mut_ptr();
1309 let mut buf_tmp = unsafe {buf_dat.offset(len as int)};
1312 let buf_v = v.as_ptr();
1314 // step 1. sort short runs with insertion sort. This takes the
1315 // values from `v` and sorts them into `buf_dat`, leaving that
1316 // with sorted runs of length INSERTION.
1318 // We could hardcode the sorting comparisons here, and we could
1319 // manipulate/step the pointers themselves, rather than repeatedly
1321 for start in range_step(0, len, insertion) {
1322 // start <= i < len;
1323 for i in range(start, cmp::min(start + insertion, len)) {
1324 // j satisfies: start <= j <= i;
1325 let mut j = i as int;
1327 // `i` is in bounds.
1328 let read_ptr = buf_v.offset(i as int);
1330 // find where to insert, we need to do strict <,
1331 // rather than <=, to maintain stability.
1333 // start <= j - 1 < len, so .offset(j - 1) is in
1335 while j > start as int &&
1336 compare(&*read_ptr, &*buf_dat.offset(j - 1)) == Less {
1340 // shift everything to the right, to make space to
1341 // insert this value.
1343 // j + 1 could be `len` (for the last `i`), but in
1344 // that case, `i == j` so we don't copy. The
1345 // `.offset(j)` is always in bounds.
1346 ptr::copy_memory(buf_dat.offset(j + 1),
1347 &*buf_dat.offset(j),
1349 ptr::copy_nonoverlapping_memory(buf_dat.offset(j), read_ptr, 1);
1354 // step 2. merge the sorted runs.
1355 let mut width = insertion;
1357 // merge the sorted runs of length `width` in `buf_dat` two at
1358 // a time, placing the result in `buf_tmp`.
1360 // 0 <= start <= len.
1361 for start in range_step(0, len, 2 * width) {
1362 // manipulate pointers directly for speed (rather than
1363 // using a `for` loop with `range` and `.offset` inside
1366 // the end of the first run & start of the
1367 // second. Offset of `len` is defined, since this is
1368 // precisely one byte past the end of the object.
1369 let right_start = buf_dat.offset(cmp::min(start + width, len) as int);
1370 // end of the second. Similar reasoning to the above re safety.
1371 let right_end_idx = cmp::min(start + 2 * width, len);
1372 let right_end = buf_dat.offset(right_end_idx as int);
1374 // the pointers to the elements under consideration
1375 // from the two runs.
1377 // both of these are in bounds.
1378 let mut left = buf_dat.offset(start as int);
1379 let mut right = right_start;
1381 // where we're putting the results, it is a run of
1382 // length `2*width`, so we step it once for each step
1383 // of either `left` or `right`. `buf_tmp` has length
1384 // `len`, so these are in bounds.
1385 let mut out = buf_tmp.offset(start as int);
1386 let out_end = buf_tmp.offset(right_end_idx as int);
1388 while out < out_end {
1389 // Either the left or the right run are exhausted,
1390 // so just copy the remainder from the other run
1391 // and move on; this gives a huge speed-up (order
1392 // of 25%) for mostly sorted vectors (the best
1394 if left == right_start {
1395 // the number remaining in this run.
1396 let elems = (right_end as uint - right as uint) / mem::size_of::<T>();
1397 ptr::copy_nonoverlapping_memory(out, &*right, elems);
1399 } else if right == right_end {
1400 let elems = (right_start as uint - left as uint) / mem::size_of::<T>();
1401 ptr::copy_nonoverlapping_memory(out, &*left, elems);
1405 // check which side is smaller, and that's the
1406 // next element for the new run.
1408 // `left < right_start` and `right < right_end`,
1409 // so these are valid.
1410 let to_copy = if compare(&*left, &*right) == Greater {
1415 ptr::copy_nonoverlapping_memory(out, &*to_copy, 1);
1421 mem::swap(&mut buf_dat, &mut buf_tmp);
1426 // write the result to `v` in one go, so that there are never two copies
1427 // of the same object in `v`.
1429 ptr::copy_nonoverlapping_memory(v.as_mut_ptr(), &*buf_dat, len);
1432 // increment the pointer, returning the old pointer.
1434 unsafe fn step<T>(ptr: &mut *mut T) -> *mut T {
1436 *ptr = ptr.offset(1);
1441 /// Deprecated, unsafe operations
1444 pub use core::slice::raw::{buf_as_slice, mut_buf_as_slice};
1445 pub use core::slice::raw::{shift_ptr, pop_ptr};
1450 use std::boxed::Box;
1451 use prelude::{Some, None, range, Vec, ToString, Clone, Greater, Less, Equal};
1452 use prelude::{SliceExt, Iterator, IteratorExt};
1453 use prelude::AsSlice;
1454 use prelude::{RandomAccessIterator, Ord, SliceConcatExt};
1455 use core::cell::Cell;
1456 use core::default::Default;
1458 use std::rand::{Rng, thread_rng};
1460 use super::ElementSwaps;
1462 fn square(n: uint) -> uint { n * n }
1464 fn is_odd(n: &uint) -> bool { *n % 2u == 1u }
1468 // Test on-stack from_fn.
1469 let mut v = Vec::from_fn(3u, square);
1471 let v = v.as_slice();
1472 assert_eq!(v.len(), 3u);
1473 assert_eq!(v[0], 0u);
1474 assert_eq!(v[1], 1u);
1475 assert_eq!(v[2], 4u);
1478 // Test on-heap from_fn.
1479 v = Vec::from_fn(5u, square);
1481 let v = v.as_slice();
1482 assert_eq!(v.len(), 5u);
1483 assert_eq!(v[0], 0u);
1484 assert_eq!(v[1], 1u);
1485 assert_eq!(v[2], 4u);
1486 assert_eq!(v[3], 9u);
1487 assert_eq!(v[4], 16u);
1492 fn test_from_elem() {
1493 // Test on-stack from_elem.
1494 let mut v = Vec::from_elem(2u, 10u);
1496 let v = v.as_slice();
1497 assert_eq!(v.len(), 2u);
1498 assert_eq!(v[0], 10u);
1499 assert_eq!(v[1], 10u);
1502 // Test on-heap from_elem.
1503 v = Vec::from_elem(6u, 20u);
1505 let v = v.as_slice();
1506 assert_eq!(v[0], 20u);
1507 assert_eq!(v[1], 20u);
1508 assert_eq!(v[2], 20u);
1509 assert_eq!(v[3], 20u);
1510 assert_eq!(v[4], 20u);
1511 assert_eq!(v[5], 20u);
1516 fn test_is_empty() {
1517 let xs: [int; 0] = [];
1518 assert!(xs.is_empty());
1519 assert!(![0i].is_empty());
1523 fn test_len_divzero() {
1525 let v0 : &[Z] = &[];
1526 let v1 : &[Z] = &[[]];
1527 let v2 : &[Z] = &[[], []];
1528 assert_eq!(mem::size_of::<Z>(), 0);
1529 assert_eq!(v0.len(), 0);
1530 assert_eq!(v1.len(), 1);
1531 assert_eq!(v2.len(), 2);
1536 let mut a = vec![11i];
1537 assert_eq!(a.as_slice().get(1), None);
1539 assert_eq!(a.as_slice().get(1).unwrap(), &12);
1540 a = vec![11i, 12, 13];
1541 assert_eq!(a.as_slice().get(1).unwrap(), &12);
1547 assert_eq!(a.as_slice().head(), None);
1549 assert_eq!(a.as_slice().head().unwrap(), &11);
1551 assert_eq!(a.as_slice().head().unwrap(), &11);
1555 fn test_head_mut() {
1557 assert_eq!(a.head_mut(), None);
1559 assert_eq!(*a.head_mut().unwrap(), 11);
1561 assert_eq!(*a.head_mut().unwrap(), 11);
1566 let mut a = vec![11i];
1567 let b: &[int] = &[];
1568 assert_eq!(a.tail(), b);
1570 let b: &[int] = &[12];
1571 assert_eq!(a.tail(), b);
1575 fn test_tail_mut() {
1576 let mut a = vec![11i];
1577 let b: &mut [int] = &mut [];
1578 assert!(a.tail_mut() == b);
1580 let b: &mut [int] = &mut [12];
1581 assert!(a.tail_mut() == b);
1586 fn test_tail_empty() {
1587 let a: Vec<int> = vec![];
1593 fn test_tail_mut_empty() {
1594 let mut a: Vec<int> = vec![];
1600 let mut a = vec![11i];
1601 let b: &[int] = &[];
1602 assert_eq!(a.init(), b);
1604 let b: &[int] = &[11];
1605 assert_eq!(a.init(), b);
1609 fn test_init_mut() {
1610 let mut a = vec![11i];
1611 let b: &mut [int] = &mut [];
1612 assert!(a.init_mut() == b);
1614 let b: &mut [int] = &mut [11];
1615 assert!(a.init_mut() == b);
1620 fn test_init_empty() {
1621 let a: Vec<int> = vec![];
1627 fn test_init_mut_empty() {
1628 let mut a: Vec<int> = vec![];
1635 assert_eq!(a.as_slice().last(), None);
1637 assert_eq!(a.as_slice().last().unwrap(), &11);
1639 assert_eq!(a.as_slice().last().unwrap(), &12);
1643 fn test_last_mut() {
1645 assert_eq!(a.last_mut(), None);
1647 assert_eq!(*a.last_mut().unwrap(), 11);
1649 assert_eq!(*a.last_mut().unwrap(), 12);
1654 // Test fixed length vector.
1655 let vec_fixed = [1i, 2, 3, 4];
1656 let v_a = vec_fixed[1u..vec_fixed.len()].to_vec();
1657 assert_eq!(v_a.len(), 3u);
1658 let v_a = v_a.as_slice();
1659 assert_eq!(v_a[0], 2);
1660 assert_eq!(v_a[1], 3);
1661 assert_eq!(v_a[2], 4);
1664 let vec_stack: &[_] = &[1i, 2, 3];
1665 let v_b = vec_stack[1u..3u].to_vec();
1666 assert_eq!(v_b.len(), 2u);
1667 let v_b = v_b.as_slice();
1668 assert_eq!(v_b[0], 2);
1669 assert_eq!(v_b[1], 3);
1672 let vec_unique = vec![1i, 2, 3, 4, 5, 6];
1673 let v_d = vec_unique[1u..6u].to_vec();
1674 assert_eq!(v_d.len(), 5u);
1675 let v_d = v_d.as_slice();
1676 assert_eq!(v_d[0], 2);
1677 assert_eq!(v_d[1], 3);
1678 assert_eq!(v_d[2], 4);
1679 assert_eq!(v_d[3], 5);
1680 assert_eq!(v_d[4], 6);
1684 fn test_slice_from() {
1685 let vec: &[int] = &[1, 2, 3, 4];
1686 assert_eq!(vec[0..], vec);
1687 let b: &[int] = &[3, 4];
1688 assert_eq!(vec[2..], b);
1689 let b: &[int] = &[];
1690 assert_eq!(vec[4..], b);
1694 fn test_slice_to() {
1695 let vec: &[int] = &[1, 2, 3, 4];
1696 assert_eq!(vec[..4], vec);
1697 let b: &[int] = &[1, 2];
1698 assert_eq!(vec[..2], b);
1699 let b: &[int] = &[];
1700 assert_eq!(vec[..0], b);
1706 let mut v = vec![5i];
1708 assert_eq!(v.len(), 0);
1709 assert_eq!(e, Some(5));
1711 assert_eq!(f, None);
1713 assert_eq!(g, None);
1717 fn test_swap_remove() {
1718 let mut v = vec![1i, 2, 3, 4, 5];
1719 let mut e = v.swap_remove(0);
1721 assert_eq!(v, vec![5i, 2, 3, 4]);
1722 e = v.swap_remove(3);
1724 assert_eq!(v, vec![5i, 2, 3]);
1729 fn test_swap_remove_fail() {
1730 let mut v = vec![1i];
1731 let _ = v.swap_remove(0);
1732 let _ = v.swap_remove(0);
1736 fn test_swap_remove_noncopyable() {
1737 // Tests that we don't accidentally run destructors twice.
1738 let mut v = Vec::new();
1742 let mut _e = v.swap_remove(0);
1743 assert_eq!(v.len(), 2);
1744 _e = v.swap_remove(1);
1745 assert_eq!(v.len(), 1);
1746 _e = v.swap_remove(0);
1747 assert_eq!(v.len(), 0);
1752 // Test on-stack push().
1755 assert_eq!(v.len(), 1u);
1756 assert_eq!(v.as_slice()[0], 1);
1758 // Test on-heap push().
1760 assert_eq!(v.len(), 2u);
1761 assert_eq!(v.as_slice()[0], 1);
1762 assert_eq!(v.as_slice()[1], 2);
1767 // Test on-stack grow().
1771 let v = v.as_slice();
1772 assert_eq!(v.len(), 2u);
1773 assert_eq!(v[0], 1);
1774 assert_eq!(v[1], 1);
1777 // Test on-heap grow().
1780 let v = v.as_slice();
1781 assert_eq!(v.len(), 5u);
1782 assert_eq!(v[0], 1);
1783 assert_eq!(v[1], 1);
1784 assert_eq!(v[2], 2);
1785 assert_eq!(v[3], 2);
1786 assert_eq!(v[4], 2);
1793 v.grow_fn(3u, square);
1794 let v = v.as_slice();
1795 assert_eq!(v.len(), 3u);
1796 assert_eq!(v[0], 0u);
1797 assert_eq!(v[1], 1u);
1798 assert_eq!(v[2], 4u);
1802 fn test_truncate() {
1803 let mut v = vec![box 6i,box 5,box 4];
1805 let v = v.as_slice();
1806 assert_eq!(v.len(), 1);
1807 assert_eq!(*(v[0]), 6);
1808 // If the unsafe block didn't drop things properly, we blow up here.
1813 let mut v = vec![box 6i,box 5,box 4];
1815 assert_eq!(v.len(), 0);
1816 // If the unsafe block didn't drop things properly, we blow up here.
1821 fn case(a: Vec<uint>, b: Vec<uint>) {
1826 case(vec![], vec![]);
1827 case(vec![1u], vec![1]);
1828 case(vec![1u,1], vec![1]);
1829 case(vec![1u,2,3], vec![1,2,3]);
1830 case(vec![1u,1,2,3], vec![1,2,3]);
1831 case(vec![1u,2,2,3], vec![1,2,3]);
1832 case(vec![1u,2,3,3], vec![1,2,3]);
1833 case(vec![1u,1,2,2,2,3,3], vec![1,2,3]);
1837 fn test_dedup_unique() {
1838 let mut v0 = vec![box 1i, box 1, box 2, box 3];
1840 let mut v1 = vec![box 1i, box 2, box 2, box 3];
1842 let mut v2 = vec![box 1i, box 2, box 3, box 3];
1845 * If the boxed pointers were leaked or otherwise misused, valgrind
1846 * and/or rt should raise errors.
1851 fn test_dedup_shared() {
1852 let mut v0 = vec![box 1i, box 1, box 2, box 3];
1854 let mut v1 = vec![box 1i, box 2, box 2, box 3];
1856 let mut v2 = vec![box 1i, box 2, box 3, box 3];
1859 * If the pointers were leaked or otherwise misused, valgrind and/or
1860 * rt should raise errors.
1866 let mut v = vec![1u, 2, 3, 4, 5];
1868 assert_eq!(v, vec![1u, 3, 5]);
1872 fn test_element_swaps() {
1873 let mut v = [1i, 2, 3];
1874 for (i, (a, b)) in ElementSwaps::new(v.len()).enumerate() {
1877 0 => assert!(v == [1, 3, 2]),
1878 1 => assert!(v == [3, 1, 2]),
1879 2 => assert!(v == [3, 2, 1]),
1880 3 => assert!(v == [2, 3, 1]),
1881 4 => assert!(v == [2, 1, 3]),
1882 5 => assert!(v == [1, 2, 3]),
1889 fn test_permutations() {
1891 let v: [int; 0] = [];
1892 let mut it = v.permutations();
1893 let (min_size, max_opt) = it.size_hint();
1894 assert_eq!(min_size, 1);
1895 assert_eq!(max_opt.unwrap(), 1);
1896 assert_eq!(it.next(), Some(v.as_slice().to_vec()));
1897 assert_eq!(it.next(), None);
1900 let v = ["Hello".to_string()];
1901 let mut it = v.permutations();
1902 let (min_size, max_opt) = it.size_hint();
1903 assert_eq!(min_size, 1);
1904 assert_eq!(max_opt.unwrap(), 1);
1905 assert_eq!(it.next(), Some(v.as_slice().to_vec()));
1906 assert_eq!(it.next(), None);
1910 let mut it = v.permutations();
1911 let (min_size, max_opt) = it.size_hint();
1912 assert_eq!(min_size, 3*2);
1913 assert_eq!(max_opt.unwrap(), 3*2);
1914 assert_eq!(it.next(), Some(vec![1,2,3]));
1915 assert_eq!(it.next(), Some(vec![1,3,2]));
1916 assert_eq!(it.next(), Some(vec![3,1,2]));
1917 let (min_size, max_opt) = it.size_hint();
1918 assert_eq!(min_size, 3);
1919 assert_eq!(max_opt.unwrap(), 3);
1920 assert_eq!(it.next(), Some(vec![3,2,1]));
1921 assert_eq!(it.next(), Some(vec![2,3,1]));
1922 assert_eq!(it.next(), Some(vec![2,1,3]));
1923 assert_eq!(it.next(), None);
1926 // check that we have N! permutations
1927 let v = ['A', 'B', 'C', 'D', 'E', 'F'];
1929 let mut it = v.permutations();
1930 let (min_size, max_opt) = it.size_hint();
1934 assert_eq!(amt, it.swaps.swaps_made);
1935 assert_eq!(amt, min_size);
1936 assert_eq!(amt, 2 * 3 * 4 * 5 * 6);
1937 assert_eq!(amt, max_opt.unwrap());
1942 fn test_lexicographic_permutations() {
1943 let v : &mut[int] = &mut[1i, 2, 3, 4, 5];
1944 assert!(v.prev_permutation() == false);
1945 assert!(v.next_permutation());
1946 let b: &mut[int] = &mut[1, 2, 3, 5, 4];
1948 assert!(v.prev_permutation());
1949 let b: &mut[int] = &mut[1, 2, 3, 4, 5];
1951 assert!(v.next_permutation());
1952 assert!(v.next_permutation());
1953 let b: &mut[int] = &mut[1, 2, 4, 3, 5];
1955 assert!(v.next_permutation());
1956 let b: &mut[int] = &mut[1, 2, 4, 5, 3];
1959 let v : &mut[int] = &mut[1i, 0, 0, 0];
1960 assert!(v.next_permutation() == false);
1961 assert!(v.prev_permutation());
1962 let b: &mut[int] = &mut[0, 1, 0, 0];
1964 assert!(v.prev_permutation());
1965 let b: &mut[int] = &mut[0, 0, 1, 0];
1967 assert!(v.prev_permutation());
1968 let b: &mut[int] = &mut[0, 0, 0, 1];
1970 assert!(v.prev_permutation() == false);
1974 fn test_lexicographic_permutations_empty_and_short() {
1975 let empty : &mut[int] = &mut[];
1976 assert!(empty.next_permutation() == false);
1977 let b: &mut[int] = &mut[];
1978 assert!(empty == b);
1979 assert!(empty.prev_permutation() == false);
1980 assert!(empty == b);
1982 let one_elem : &mut[int] = &mut[4i];
1983 assert!(one_elem.prev_permutation() == false);
1984 let b: &mut[int] = &mut[4];
1985 assert!(one_elem == b);
1986 assert!(one_elem.next_permutation() == false);
1987 assert!(one_elem == b);
1989 let two_elem : &mut[int] = &mut[1i, 2];
1990 assert!(two_elem.prev_permutation() == false);
1991 let b : &mut[int] = &mut[1, 2];
1992 let c : &mut[int] = &mut[2, 1];
1993 assert!(two_elem == b);
1994 assert!(two_elem.next_permutation());
1995 assert!(two_elem == c);
1996 assert!(two_elem.next_permutation() == false);
1997 assert!(two_elem == c);
1998 assert!(two_elem.prev_permutation());
1999 assert!(two_elem == b);
2000 assert!(two_elem.prev_permutation() == false);
2001 assert!(two_elem == b);
2005 fn test_position_elem() {
2006 assert!([].position_elem(&1i).is_none());
2008 let v1 = vec![1i, 2, 3, 3, 2, 5];
2009 assert_eq!(v1.as_slice().position_elem(&1), Some(0u));
2010 assert_eq!(v1.as_slice().position_elem(&2), Some(1u));
2011 assert_eq!(v1.as_slice().position_elem(&5), Some(5u));
2012 assert!(v1.as_slice().position_elem(&4).is_none());
2016 fn test_binary_search() {
2017 assert_eq!([1i,2,3,4,5].binary_search(&5).ok(), Some(4));
2018 assert_eq!([1i,2,3,4,5].binary_search(&4).ok(), Some(3));
2019 assert_eq!([1i,2,3,4,5].binary_search(&3).ok(), Some(2));
2020 assert_eq!([1i,2,3,4,5].binary_search(&2).ok(), Some(1));
2021 assert_eq!([1i,2,3,4,5].binary_search(&1).ok(), Some(0));
2023 assert_eq!([2i,4,6,8,10].binary_search(&1).ok(), None);
2024 assert_eq!([2i,4,6,8,10].binary_search(&5).ok(), None);
2025 assert_eq!([2i,4,6,8,10].binary_search(&4).ok(), Some(1));
2026 assert_eq!([2i,4,6,8,10].binary_search(&10).ok(), Some(4));
2028 assert_eq!([2i,4,6,8].binary_search(&1).ok(), None);
2029 assert_eq!([2i,4,6,8].binary_search(&5).ok(), None);
2030 assert_eq!([2i,4,6,8].binary_search(&4).ok(), Some(1));
2031 assert_eq!([2i,4,6,8].binary_search(&8).ok(), Some(3));
2033 assert_eq!([2i,4,6].binary_search(&1).ok(), None);
2034 assert_eq!([2i,4,6].binary_search(&5).ok(), None);
2035 assert_eq!([2i,4,6].binary_search(&4).ok(), Some(1));
2036 assert_eq!([2i,4,6].binary_search(&6).ok(), Some(2));
2038 assert_eq!([2i,4].binary_search(&1).ok(), None);
2039 assert_eq!([2i,4].binary_search(&5).ok(), None);
2040 assert_eq!([2i,4].binary_search(&2).ok(), Some(0));
2041 assert_eq!([2i,4].binary_search(&4).ok(), Some(1));
2043 assert_eq!([2i].binary_search(&1).ok(), None);
2044 assert_eq!([2i].binary_search(&5).ok(), None);
2045 assert_eq!([2i].binary_search(&2).ok(), Some(0));
2047 assert_eq!([].binary_search(&1i).ok(), None);
2048 assert_eq!([].binary_search(&5i).ok(), None);
2050 assert!([1i,1,1,1,1].binary_search(&1).ok() != None);
2051 assert!([1i,1,1,1,2].binary_search(&1).ok() != None);
2052 assert!([1i,1,1,2,2].binary_search(&1).ok() != None);
2053 assert!([1i,1,2,2,2].binary_search(&1).ok() != None);
2054 assert_eq!([1i,2,2,2,2].binary_search(&1).ok(), Some(0));
2056 assert_eq!([1i,2,3,4,5].binary_search(&6).ok(), None);
2057 assert_eq!([1i,2,3,4,5].binary_search(&0).ok(), None);
2062 let mut v: Vec<int> = vec![10i, 20];
2063 assert_eq!(v[0], 10);
2064 assert_eq!(v[1], 20);
2066 assert_eq!(v[0], 20);
2067 assert_eq!(v[1], 10);
2069 let mut v3: Vec<int> = vec![];
2071 assert!(v3.is_empty());
2076 for len in range(4u, 25) {
2077 for _ in range(0i, 100) {
2078 let mut v = thread_rng().gen_iter::<uint>().take(len)
2079 .collect::<Vec<uint>>();
2080 let mut v1 = v.clone();
2083 assert!(v.as_slice().windows(2).all(|w| w[0] <= w[1]));
2085 v1.sort_by(|a, b| a.cmp(b));
2086 assert!(v1.as_slice().windows(2).all(|w| w[0] <= w[1]));
2088 v1.sort_by(|a, b| b.cmp(a));
2089 assert!(v1.as_slice().windows(2).all(|w| w[0] >= w[1]));
2094 let mut v: [uint; 0] = [];
2097 let mut v = [0xDEADBEEFu];
2099 assert!(v == [0xDEADBEEF]);
2103 fn test_sort_stability() {
2104 for len in range(4i, 25) {
2105 for _ in range(0u, 10) {
2106 let mut counts = [0i; 10];
2108 // create a vector like [(6, 1), (5, 1), (6, 2), ...],
2109 // where the first item of each tuple is random, but
2110 // the second item represents which occurrence of that
2111 // number this element is, i.e. the second elements
2112 // will occur in sorted order.
2113 let mut v = range(0, len).map(|_| {
2114 let n = thread_rng().gen::<uint>() % 10;
2117 }).collect::<Vec<(uint, int)>>();
2119 // only sort on the first element, so an unstable sort
2120 // may mix up the counts.
2121 v.sort_by(|&(a,_), &(b,_)| a.cmp(&b));
2123 // this comparison includes the count (the second item
2124 // of the tuple), so elements with equal first items
2125 // will need to be ordered with increasing
2126 // counts... i.e. exactly asserting that this sort is
2128 assert!(v.as_slice().windows(2).all(|w| w[0] <= w[1]));
2134 fn test_partition() {
2135 assert_eq!((vec![]).partition(|x: &int| *x < 3), (vec![], vec![]));
2136 assert_eq!((vec![1i, 2, 3]).partition(|x: &int| *x < 4), (vec![1, 2, 3], vec![]));
2137 assert_eq!((vec![1i, 2, 3]).partition(|x: &int| *x < 2), (vec![1], vec![2, 3]));
2138 assert_eq!((vec![1i, 2, 3]).partition(|x: &int| *x < 0), (vec![], vec![1, 2, 3]));
2142 fn test_partitioned() {
2143 assert_eq!(([]).partitioned(|x: &int| *x < 3), (vec![], vec![]));
2144 assert_eq!(([1i, 2, 3]).partitioned(|x: &int| *x < 4), (vec![1, 2, 3], vec![]));
2145 assert_eq!(([1i, 2, 3]).partitioned(|x: &int| *x < 2), (vec![1], vec![2, 3]));
2146 assert_eq!(([1i, 2, 3]).partitioned(|x: &int| *x < 0), (vec![], vec![1, 2, 3]));
2151 let v: [Vec<int>; 0] = [];
2152 let c: Vec<int> = v.concat();
2154 let d: Vec<int> = [vec![1i], vec![2i,3i]].concat();
2155 assert_eq!(d, vec![1i, 2, 3]);
2157 let v: [&[int]; 2] = [&[1], &[2, 3]];
2158 assert_eq!(v.connect(&0), vec![1i, 0, 2, 3]);
2159 let v: [&[int]; 3] = [&[1i], &[2], &[3]];
2160 assert_eq!(v.connect(&0), vec![1i, 0, 2, 0, 3]);
2165 let v: [Vec<int>; 0] = [];
2166 assert_eq!(v.connect_vec(&0), vec![]);
2167 assert_eq!([vec![1i], vec![2i, 3]].connect_vec(&0), vec![1, 0, 2, 3]);
2168 assert_eq!([vec![1i], vec![2i], vec![3i]].connect_vec(&0), vec![1, 0, 2, 0, 3]);
2170 let v: [&[int]; 2] = [&[1], &[2, 3]];
2171 assert_eq!(v.connect_vec(&0), vec![1, 0, 2, 3]);
2172 let v: [&[int]; 3] = [&[1], &[2], &[3]];
2173 assert_eq!(v.connect_vec(&0), vec![1, 0, 2, 0, 3]);
2178 let mut a = vec![1i, 2, 4];
2180 assert_eq!(a, vec![1, 2, 3, 4]);
2182 let mut a = vec![1i, 2, 3];
2184 assert_eq!(a, vec![0, 1, 2, 3]);
2186 let mut a = vec![1i, 2, 3];
2188 assert_eq!(a, vec![1, 2, 3, 4]);
2192 assert_eq!(a, vec![1]);
2197 fn test_insert_oob() {
2198 let mut a = vec![1i, 2, 3];
2204 let mut a = vec![1i,2,3,4];
2206 assert_eq!(a.remove(2), 3);
2207 assert_eq!(a, vec![1i,2,4]);
2209 assert_eq!(a.remove(2), 4);
2210 assert_eq!(a, vec![1i,2]);
2212 assert_eq!(a.remove(0), 1);
2213 assert_eq!(a, vec![2i]);
2215 assert_eq!(a.remove(0), 2);
2216 assert_eq!(a, vec![]);
2221 fn test_remove_fail() {
2222 let mut a = vec![1i];
2223 let _ = a.remove(0);
2224 let _ = a.remove(0);
2228 fn test_capacity() {
2229 let mut v = vec![0u64];
2230 v.reserve_exact(10u);
2231 assert!(v.capacity() >= 11u);
2232 let mut v = vec![0u32];
2233 v.reserve_exact(10u);
2234 assert!(v.capacity() >= 11u);
2239 let v = vec![1i, 2, 3, 4, 5];
2240 let v = v.slice(1u, 3u);
2241 assert_eq!(v.len(), 2u);
2242 assert_eq!(v[0], 2);
2243 assert_eq!(v[1], 3);
2249 fn test_from_fn_fail() {
2250 Vec::from_fn(100, |v| {
2251 if v == 50 { panic!() }
2258 fn test_from_elem_fail() {
2262 boxes: (Box<int>, Rc<int>)
2266 fn clone(&self) -> S {
2267 self.f.set(self.f.get() + 1);
2268 if self.f.get() == 10 { panic!() }
2271 boxes: self.boxes.clone(),
2278 boxes: (box 0, Rc::new(0)),
2280 let _ = Vec::from_elem(100, s);
2285 fn test_grow_fn_fail() {
2287 v.grow_fn(100, |i| {
2291 (box 0i, Rc::new(0i))
2297 fn test_permute_fail() {
2298 let v = [(box 0i, Rc::new(0i)), (box 0i, Rc::new(0i)),
2299 (box 0i, Rc::new(0i)), (box 0i, Rc::new(0i))];
2301 for _ in v.permutations() {
2310 fn test_total_ord() {
2311 let c: &[int] = &[1, 2, 3];
2312 [1, 2, 3, 4][].cmp(c) == Greater;
2313 let c: &[int] = &[1, 2, 3, 4];
2314 [1, 2, 3][].cmp(c) == Less;
2315 let c: &[int] = &[1, 2, 3, 6];
2316 [1, 2, 3, 4][].cmp(c) == Equal;
2317 let c: &[int] = &[1, 2, 3, 4, 5, 6];
2318 [1, 2, 3, 4, 5, 5, 5, 5][].cmp(c) == Less;
2319 let c: &[int] = &[1, 2, 3, 4];
2320 [2, 2][].cmp(c) == Greater;
2324 fn test_iterator() {
2325 let xs = [1i, 2, 5, 10, 11];
2326 let mut it = xs.iter();
2327 assert_eq!(it.size_hint(), (5, Some(5)));
2328 assert_eq!(it.next().unwrap(), &1);
2329 assert_eq!(it.size_hint(), (4, Some(4)));
2330 assert_eq!(it.next().unwrap(), &2);
2331 assert_eq!(it.size_hint(), (3, Some(3)));
2332 assert_eq!(it.next().unwrap(), &5);
2333 assert_eq!(it.size_hint(), (2, Some(2)));
2334 assert_eq!(it.next().unwrap(), &10);
2335 assert_eq!(it.size_hint(), (1, Some(1)));
2336 assert_eq!(it.next().unwrap(), &11);
2337 assert_eq!(it.size_hint(), (0, Some(0)));
2338 assert!(it.next().is_none());
2342 fn test_random_access_iterator() {
2343 let xs = [1i, 2, 5, 10, 11];
2344 let mut it = xs.iter();
2346 assert_eq!(it.indexable(), 5);
2347 assert_eq!(it.idx(0).unwrap(), &1);
2348 assert_eq!(it.idx(2).unwrap(), &5);
2349 assert_eq!(it.idx(4).unwrap(), &11);
2350 assert!(it.idx(5).is_none());
2352 assert_eq!(it.next().unwrap(), &1);
2353 assert_eq!(it.indexable(), 4);
2354 assert_eq!(it.idx(0).unwrap(), &2);
2355 assert_eq!(it.idx(3).unwrap(), &11);
2356 assert!(it.idx(4).is_none());
2358 assert_eq!(it.next().unwrap(), &2);
2359 assert_eq!(it.indexable(), 3);
2360 assert_eq!(it.idx(1).unwrap(), &10);
2361 assert!(it.idx(3).is_none());
2363 assert_eq!(it.next().unwrap(), &5);
2364 assert_eq!(it.indexable(), 2);
2365 assert_eq!(it.idx(1).unwrap(), &11);
2367 assert_eq!(it.next().unwrap(), &10);
2368 assert_eq!(it.indexable(), 1);
2369 assert_eq!(it.idx(0).unwrap(), &11);
2370 assert!(it.idx(1).is_none());
2372 assert_eq!(it.next().unwrap(), &11);
2373 assert_eq!(it.indexable(), 0);
2374 assert!(it.idx(0).is_none());
2376 assert!(it.next().is_none());
2380 fn test_iter_size_hints() {
2381 let mut xs = [1i, 2, 5, 10, 11];
2382 assert_eq!(xs.iter().size_hint(), (5, Some(5)));
2383 assert_eq!(xs.iter_mut().size_hint(), (5, Some(5)));
2387 fn test_iter_clone() {
2388 let xs = [1i, 2, 5];
2389 let mut it = xs.iter();
2391 let mut jt = it.clone();
2392 assert_eq!(it.next(), jt.next());
2393 assert_eq!(it.next(), jt.next());
2394 assert_eq!(it.next(), jt.next());
2398 fn test_mut_iterator() {
2399 let mut xs = [1i, 2, 3, 4, 5];
2400 for x in xs.iter_mut() {
2403 assert!(xs == [2, 3, 4, 5, 6])
2407 fn test_rev_iterator() {
2409 let xs = [1i, 2, 5, 10, 11];
2410 let ys = [11, 10, 5, 2, 1];
2412 for &x in xs.iter().rev() {
2413 assert_eq!(x, ys[i]);
2420 fn test_mut_rev_iterator() {
2421 let mut xs = [1u, 2, 3, 4, 5];
2422 for (i,x) in xs.iter_mut().rev().enumerate() {
2425 assert!(xs == [5, 5, 5, 5, 5])
2429 fn test_move_iterator() {
2430 let xs = vec![1u,2,3,4,5];
2431 assert_eq!(xs.into_iter().fold(0, |a: uint, b: uint| 10*a + b), 12345);
2435 fn test_move_rev_iterator() {
2436 let xs = vec![1u,2,3,4,5];
2437 assert_eq!(xs.into_iter().rev().fold(0, |a: uint, b: uint| 10*a + b), 54321);
2441 fn test_splitator() {
2442 let xs = &[1i,2,3,4,5];
2444 let splits: &[&[int]] = &[&[1], &[3], &[5]];
2445 assert_eq!(xs.split(|x| *x % 2 == 0).collect::<Vec<&[int]>>(),
2447 let splits: &[&[int]] = &[&[], &[2,3,4,5]];
2448 assert_eq!(xs.split(|x| *x == 1).collect::<Vec<&[int]>>(),
2450 let splits: &[&[int]] = &[&[1,2,3,4], &[]];
2451 assert_eq!(xs.split(|x| *x == 5).collect::<Vec<&[int]>>(),
2453 let splits: &[&[int]] = &[&[1,2,3,4,5]];
2454 assert_eq!(xs.split(|x| *x == 10).collect::<Vec<&[int]>>(),
2456 let splits: &[&[int]] = &[&[], &[], &[], &[], &[], &[]];
2457 assert_eq!(xs.split(|_| true).collect::<Vec<&[int]>>(),
2460 let xs: &[int] = &[];
2461 let splits: &[&[int]] = &[&[]];
2462 assert_eq!(xs.split(|x| *x == 5).collect::<Vec<&[int]>>(), splits);
2466 fn test_splitnator() {
2467 let xs = &[1i,2,3,4,5];
2469 let splits: &[&[int]] = &[&[1,2,3,4,5]];
2470 assert_eq!(xs.splitn(0, |x| *x % 2 == 0).collect::<Vec<&[int]>>(),
2472 let splits: &[&[int]] = &[&[1], &[3,4,5]];
2473 assert_eq!(xs.splitn(1, |x| *x % 2 == 0).collect::<Vec<&[int]>>(),
2475 let splits: &[&[int]] = &[&[], &[], &[], &[4,5]];
2476 assert_eq!(xs.splitn(3, |_| true).collect::<Vec<&[int]>>(),
2479 let xs: &[int] = &[];
2480 let splits: &[&[int]] = &[&[]];
2481 assert_eq!(xs.splitn(1, |x| *x == 5).collect::<Vec<&[int]>>(), splits);
2485 fn test_splitnator_mut() {
2486 let xs = &mut [1i,2,3,4,5];
2488 let splits: &[&mut [int]] = &[&mut [1,2,3,4,5]];
2489 assert_eq!(xs.splitn_mut(0, |x| *x % 2 == 0).collect::<Vec<&mut [int]>>(),
2491 let splits: &[&mut [int]] = &[&mut [1], &mut [3,4,5]];
2492 assert_eq!(xs.splitn_mut(1, |x| *x % 2 == 0).collect::<Vec<&mut [int]>>(),
2494 let splits: &[&mut [int]] = &[&mut [], &mut [], &mut [], &mut [4,5]];
2495 assert_eq!(xs.splitn_mut(3, |_| true).collect::<Vec<&mut [int]>>(),
2498 let xs: &mut [int] = &mut [];
2499 let splits: &[&mut [int]] = &[&mut []];
2500 assert_eq!(xs.splitn_mut(1, |x| *x == 5).collect::<Vec<&mut [int]>>(),
2505 fn test_rsplitator() {
2506 let xs = &[1i,2,3,4,5];
2508 let splits: &[&[int]] = &[&[5], &[3], &[1]];
2509 assert_eq!(xs.split(|x| *x % 2 == 0).rev().collect::<Vec<&[int]>>(),
2511 let splits: &[&[int]] = &[&[2,3,4,5], &[]];
2512 assert_eq!(xs.split(|x| *x == 1).rev().collect::<Vec<&[int]>>(),
2514 let splits: &[&[int]] = &[&[], &[1,2,3,4]];
2515 assert_eq!(xs.split(|x| *x == 5).rev().collect::<Vec<&[int]>>(),
2517 let splits: &[&[int]] = &[&[1,2,3,4,5]];
2518 assert_eq!(xs.split(|x| *x == 10).rev().collect::<Vec<&[int]>>(),
2521 let xs: &[int] = &[];
2522 let splits: &[&[int]] = &[&[]];
2523 assert_eq!(xs.split(|x| *x == 5).rev().collect::<Vec<&[int]>>(), splits);
2527 fn test_rsplitnator() {
2528 let xs = &[1,2,3,4,5];
2530 let splits: &[&[int]] = &[&[1,2,3,4,5]];
2531 assert_eq!(xs.rsplitn(0, |x| *x % 2 == 0).collect::<Vec<&[int]>>(),
2533 let splits: &[&[int]] = &[&[5], &[1,2,3]];
2534 assert_eq!(xs.rsplitn(1, |x| *x % 2 == 0).collect::<Vec<&[int]>>(),
2536 let splits: &[&[int]] = &[&[], &[], &[], &[1,2]];
2537 assert_eq!(xs.rsplitn(3, |_| true).collect::<Vec<&[int]>>(),
2540 let xs: &[int] = &[];
2541 let splits: &[&[int]] = &[&[]];
2542 assert_eq!(xs.rsplitn(1, |x| *x == 5).collect::<Vec<&[int]>>(), splits);
2546 fn test_windowsator() {
2547 let v = &[1i,2,3,4];
2549 let wins: &[&[int]] = &[&[1,2], &[2,3], &[3,4]];
2550 assert_eq!(v.windows(2).collect::<Vec<&[int]>>(), wins);
2551 let wins: &[&[int]] = &[&[1i,2,3], &[2,3,4]];
2552 assert_eq!(v.windows(3).collect::<Vec<&[int]>>(), wins);
2553 assert!(v.windows(6).next().is_none());
2558 fn test_windowsator_0() {
2559 let v = &[1i,2,3,4];
2560 let _it = v.windows(0);
2564 fn test_chunksator() {
2565 let v = &[1i,2,3,4,5];
2567 let chunks: &[&[int]] = &[&[1i,2], &[3,4], &[5]];
2568 assert_eq!(v.chunks(2).collect::<Vec<&[int]>>(), chunks);
2569 let chunks: &[&[int]] = &[&[1i,2,3], &[4,5]];
2570 assert_eq!(v.chunks(3).collect::<Vec<&[int]>>(), chunks);
2571 let chunks: &[&[int]] = &[&[1i,2,3,4,5]];
2572 assert_eq!(v.chunks(6).collect::<Vec<&[int]>>(), chunks);
2574 let chunks: &[&[int]] = &[&[5i], &[3,4], &[1,2]];
2575 assert_eq!(v.chunks(2).rev().collect::<Vec<&[int]>>(), chunks);
2576 let mut it = v.chunks(2);
2577 assert_eq!(it.indexable(), 3);
2578 let chunk: &[int] = &[1,2];
2579 assert_eq!(it.idx(0).unwrap(), chunk);
2580 let chunk: &[int] = &[3,4];
2581 assert_eq!(it.idx(1).unwrap(), chunk);
2582 let chunk: &[int] = &[5];
2583 assert_eq!(it.idx(2).unwrap(), chunk);
2584 assert_eq!(it.idx(3), None);
2589 fn test_chunksator_0() {
2590 let v = &[1i,2,3,4];
2591 let _it = v.chunks(0);
2595 fn test_move_from() {
2596 let mut a = [1i,2,3,4,5];
2597 let b = vec![6i,7,8];
2598 assert_eq!(a.move_from(b, 0, 3), 3);
2599 assert!(a == [6i,7,8,4,5]);
2600 let mut a = [7i,2,8,1];
2601 let b = vec![3i,1,4,1,5,9];
2602 assert_eq!(a.move_from(b, 0, 6), 4);
2603 assert!(a == [3i,1,4,1]);
2604 let mut a = [1i,2,3,4];
2605 let b = vec![5i,6,7,8,9,0];
2606 assert_eq!(a.move_from(b, 2, 3), 1);
2607 assert!(a == [7i,2,3,4]);
2608 let mut a = [1i,2,3,4,5];
2609 let b = vec![5i,6,7,8,9,0];
2610 assert_eq!(a.slice_mut(2, 4).move_from(b,1,6), 2);
2611 assert!(a == [1i,2,6,7,5]);
2615 fn test_reverse_part() {
2616 let mut values = [1i,2,3,4,5];
2617 values.slice_mut(1, 4).reverse();
2618 assert!(values == [1,4,3,2,5]);
2623 macro_rules! test_show_vec(
2624 ($x:expr, $x_str:expr) => ({
2625 let (x, x_str) = ($x, $x_str);
2626 assert_eq!(format!("{}", x), x_str);
2627 assert_eq!(format!("{}", x.as_slice()), x_str);
2630 let empty: Vec<int> = vec![];
2631 test_show_vec!(empty, "[]");
2632 test_show_vec!(vec![1i], "[1]");
2633 test_show_vec!(vec![1i, 2, 3], "[1, 2, 3]");
2634 test_show_vec!(vec![vec![], vec![1u], vec![1u, 1u]],
2635 "[[], [1], [1, 1]]");
2637 let empty_mut: &mut [int] = &mut[];
2638 test_show_vec!(empty_mut, "[]");
2639 let v: &mut[int] = &mut[1];
2640 test_show_vec!(v, "[1]");
2641 let v: &mut[int] = &mut[1, 2, 3];
2642 test_show_vec!(v, "[1, 2, 3]");
2643 let v: &mut [&mut[uint]] = &mut[&mut[], &mut[1u], &mut[1u, 1u]];
2644 test_show_vec!(v, "[[], [1], [1, 1]]");
2648 fn test_vec_default() {
2651 let v: $ty = Default::default();
2652 assert!(v.is_empty());
2661 fn test_bytes_set_memory() {
2662 use slice::bytes::MutableByteVector;
2663 let mut values = [1u8,2,3,4,5];
2664 values.slice_mut(0, 5).set_memory(0xAB);
2665 assert!(values == [0xAB, 0xAB, 0xAB, 0xAB, 0xAB]);
2666 values.slice_mut(2, 4).set_memory(0xFF);
2667 assert!(values == [0xAB, 0xAB, 0xFF, 0xFF, 0xAB]);
2672 fn test_overflow_does_not_cause_segfault() {
2674 v.reserve_exact(-1);
2681 fn test_overflow_does_not_cause_segfault_managed() {
2682 let mut v = vec![Rc::new(1i)];
2683 v.reserve_exact(-1);
2684 v.push(Rc::new(2i));
2688 fn test_mut_split_at() {
2689 let mut values = [1u8,2,3,4,5];
2691 let (left, right) = values.split_at_mut(2);
2693 let left: &[_] = left;
2694 assert!(left[0..left.len()] == [1, 2][]);
2696 for p in left.iter_mut() {
2701 let right: &[_] = right;
2702 assert!(right[0..right.len()] == [3, 4, 5][]);
2704 for p in right.iter_mut() {
2709 assert!(values == [2, 3, 5, 6, 7]);
2712 #[deriving(Clone, PartialEq)]
2716 fn test_iter_zero_sized() {
2717 let mut v = vec![Foo, Foo, Foo];
2718 assert_eq!(v.len(), 3);
2727 for f in v[1..3].iter() {
2733 for f in v.iter_mut() {
2739 for f in v.into_iter() {
2743 assert_eq!(cnt, 11);
2745 let xs: [Foo; 3] = [Foo, Foo, Foo];
2747 for f in xs.iter() {
2755 fn test_shrink_to_fit() {
2756 let mut xs = vec![0, 1, 2, 3];
2757 for i in range(4i, 100) {
2760 assert_eq!(xs.capacity(), 128);
2762 assert_eq!(xs.capacity(), 100);
2763 assert_eq!(xs, range(0i, 100i).collect::<Vec<_>>());
2767 fn test_starts_with() {
2768 assert!(b"foobar".starts_with(b"foo"));
2769 assert!(!b"foobar".starts_with(b"oob"));
2770 assert!(!b"foobar".starts_with(b"bar"));
2771 assert!(!b"foo".starts_with(b"foobar"));
2772 assert!(!b"bar".starts_with(b"foobar"));
2773 assert!(b"foobar".starts_with(b"foobar"));
2774 let empty: &[u8] = &[];
2775 assert!(empty.starts_with(empty));
2776 assert!(!empty.starts_with(b"foo"));
2777 assert!(b"foobar".starts_with(empty));
2781 fn test_ends_with() {
2782 assert!(b"foobar".ends_with(b"bar"));
2783 assert!(!b"foobar".ends_with(b"oba"));
2784 assert!(!b"foobar".ends_with(b"foo"));
2785 assert!(!b"foo".ends_with(b"foobar"));
2786 assert!(!b"bar".ends_with(b"foobar"));
2787 assert!(b"foobar".ends_with(b"foobar"));
2788 let empty: &[u8] = &[];
2789 assert!(empty.ends_with(empty));
2790 assert!(!empty.ends_with(b"foo"));
2791 assert!(b"foobar".ends_with(empty));
2795 fn test_mut_splitator() {
2796 let mut xs = [0i,1,0,2,3,0,0,4,5,0];
2797 assert_eq!(xs.split_mut(|x| *x == 0).count(), 6);
2798 for slice in xs.split_mut(|x| *x == 0) {
2801 assert!(xs == [0,1,0,3,2,0,0,5,4,0]);
2803 let mut xs = [0i,1,0,2,3,0,0,4,5,0,6,7];
2804 for slice in xs.split_mut(|x| *x == 0).take(5) {
2807 assert!(xs == [0,1,0,3,2,0,0,5,4,0,6,7]);
2811 fn test_mut_splitator_rev() {
2812 let mut xs = [1i,2,0,3,4,0,0,5,6,0];
2813 for slice in xs.split_mut(|x| *x == 0).rev().take(4) {
2816 assert!(xs == [1,2,0,4,3,0,0,6,5,0]);
2821 let mut v = [0i,1,2];
2822 assert_eq!(v.get_mut(3), None);
2823 v.get_mut(1).map(|e| *e = 7);
2824 assert_eq!(v[1], 7);
2826 assert_eq!(v.get_mut(2), Some(&mut x));
2830 fn test_mut_chunks() {
2831 let mut v = [0u8, 1, 2, 3, 4, 5, 6];
2832 for (i, chunk) in v.chunks_mut(3).enumerate() {
2833 for x in chunk.iter_mut() {
2837 let result = [0u8, 0, 0, 1, 1, 1, 2];
2838 assert!(v == result);
2842 fn test_mut_chunks_rev() {
2843 let mut v = [0u8, 1, 2, 3, 4, 5, 6];
2844 for (i, chunk) in v.chunks_mut(3).rev().enumerate() {
2845 for x in chunk.iter_mut() {
2849 let result = [2u8, 2, 2, 1, 1, 1, 0];
2850 assert!(v == result);
2855 fn test_mut_chunks_0() {
2856 let mut v = [1i, 2, 3, 4];
2857 let _it = v.chunks_mut(0);
2861 fn test_mut_last() {
2862 let mut x = [1i, 2, 3, 4, 5];
2863 let h = x.last_mut();
2864 assert_eq!(*h.unwrap(), 5);
2866 let y: &mut [int] = &mut [];
2867 assert!(y.last_mut().is_none());
2872 let xs = box [1u, 2, 3];
2873 let ys = xs.to_vec();
2874 assert_eq!(ys, [1u, 2, 3]);
2883 use std::rand::{weak_rng, Rng};
2884 use test::{Bencher, black_box};
2887 fn iterator(b: &mut Bencher) {
2888 // peculiar numbers to stop LLVM from optimising the summation
2890 let v = Vec::from_fn(100, |i| i ^ (i << 1) ^ (i >> 1));
2897 // sum == 11806, to stop dead code elimination.
2898 if sum == 0 {panic!()}
2903 fn mut_iterator(b: &mut Bencher) {
2904 let mut v = Vec::from_elem(100, 0i);
2908 for x in v.iter_mut() {
2916 fn concat(b: &mut Bencher) {
2917 let xss: Vec<Vec<uint>> =
2918 Vec::from_fn(100, |i| range(0u, i).collect());
2920 xss.as_slice().concat();
2925 fn connect(b: &mut Bencher) {
2926 let xss: Vec<Vec<uint>> =
2927 Vec::from_fn(100, |i| range(0u, i).collect());
2929 xss.as_slice().connect_vec(&0)
2934 fn push(b: &mut Bencher) {
2935 let mut vec: Vec<uint> = vec![];
2943 fn starts_with_same_vector(b: &mut Bencher) {
2944 let vec: Vec<uint> = Vec::from_fn(100, |i| i);
2946 vec.as_slice().starts_with(vec.as_slice())
2951 fn starts_with_single_element(b: &mut Bencher) {
2952 let vec: Vec<uint> = vec![0];
2954 vec.as_slice().starts_with(vec.as_slice())
2959 fn starts_with_diff_one_element_at_end(b: &mut Bencher) {
2960 let vec: Vec<uint> = Vec::from_fn(100, |i| i);
2961 let mut match_vec: Vec<uint> = Vec::from_fn(99, |i| i);
2964 vec.as_slice().starts_with(match_vec.as_slice())
2969 fn ends_with_same_vector(b: &mut Bencher) {
2970 let vec: Vec<uint> = Vec::from_fn(100, |i| i);
2972 vec.as_slice().ends_with(vec.as_slice())
2977 fn ends_with_single_element(b: &mut Bencher) {
2978 let vec: Vec<uint> = vec![0];
2980 vec.as_slice().ends_with(vec.as_slice())
2985 fn ends_with_diff_one_element_at_beginning(b: &mut Bencher) {
2986 let vec: Vec<uint> = Vec::from_fn(100, |i| i);
2987 let mut match_vec: Vec<uint> = Vec::from_fn(100, |i| i);
2988 match_vec.as_mut_slice()[0] = 200;
2990 vec.as_slice().starts_with(match_vec.as_slice())
2995 fn contains_last_element(b: &mut Bencher) {
2996 let vec: Vec<uint> = Vec::from_fn(100, |i| i);
3003 fn zero_1kb_from_elem(b: &mut Bencher) {
3005 Vec::from_elem(1024, 0u8)
3010 fn zero_1kb_set_memory(b: &mut Bencher) {
3012 let mut v: Vec<uint> = Vec::with_capacity(1024);
3014 let vp = v.as_mut_ptr();
3015 ptr::set_memory(vp, 0, 1024);
3023 fn zero_1kb_loop_set(b: &mut Bencher) {
3025 let mut v: Vec<uint> = Vec::with_capacity(1024);
3029 for i in range(0u, 1024) {
3036 fn zero_1kb_mut_iter(b: &mut Bencher) {
3038 let mut v = Vec::with_capacity(1024);
3042 for x in v.iter_mut() {
3050 fn random_inserts(b: &mut Bencher) {
3051 let mut rng = weak_rng();
3053 let mut v = Vec::from_elem(30, (0u, 0u));
3054 for _ in range(0u, 100) {
3056 v.insert(rng.gen::<uint>() % (l + 1),
3062 fn random_removes(b: &mut Bencher) {
3063 let mut rng = weak_rng();
3065 let mut v = Vec::from_elem(130, (0u, 0u));
3066 for _ in range(0u, 100) {
3068 v.remove(rng.gen::<uint>() % l);
3074 fn sort_random_small(b: &mut Bencher) {
3075 let mut rng = weak_rng();
3077 let mut v = rng.gen_iter::<u64>().take(5).collect::<Vec<u64>>();
3078 v.as_mut_slice().sort();
3080 b.bytes = 5 * mem::size_of::<u64>() as u64;
3084 fn sort_random_medium(b: &mut Bencher) {
3085 let mut rng = weak_rng();
3087 let mut v = rng.gen_iter::<u64>().take(100).collect::<Vec<u64>>();
3088 v.as_mut_slice().sort();
3090 b.bytes = 100 * mem::size_of::<u64>() as u64;
3094 fn sort_random_large(b: &mut Bencher) {
3095 let mut rng = weak_rng();
3097 let mut v = rng.gen_iter::<u64>().take(10000).collect::<Vec<u64>>();
3098 v.as_mut_slice().sort();
3100 b.bytes = 10000 * mem::size_of::<u64>() as u64;
3104 fn sort_sorted(b: &mut Bencher) {
3105 let mut v = Vec::from_fn(10000, |i| i);
3109 b.bytes = (v.len() * mem::size_of_val(&v[0])) as u64;
3112 type BigSortable = (u64,u64,u64,u64);
3115 fn sort_big_random_small(b: &mut Bencher) {
3116 let mut rng = weak_rng();
3118 let mut v = rng.gen_iter::<BigSortable>().take(5)
3119 .collect::<Vec<BigSortable>>();
3122 b.bytes = 5 * mem::size_of::<BigSortable>() as u64;
3126 fn sort_big_random_medium(b: &mut Bencher) {
3127 let mut rng = weak_rng();
3129 let mut v = rng.gen_iter::<BigSortable>().take(100)
3130 .collect::<Vec<BigSortable>>();
3133 b.bytes = 100 * mem::size_of::<BigSortable>() as u64;
3137 fn sort_big_random_large(b: &mut Bencher) {
3138 let mut rng = weak_rng();
3140 let mut v = rng.gen_iter::<BigSortable>().take(10000)
3141 .collect::<Vec<BigSortable>>();
3144 b.bytes = 10000 * mem::size_of::<BigSortable>() as u64;
3148 fn sort_big_sorted(b: &mut Bencher) {
3149 let mut v = Vec::from_fn(10000u, |i| (i, i, i, i));
3153 b.bytes = (v.len() * mem::size_of_val(&v[0])) as u64;