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rust/src/libcollections/slice.rs
Aaron Turon d2ea0315e0 Revert "Use slice syntax instead of slice_to, etc." 
This reverts commit 40b9f5ded5.
2014-10-02 11:48:07 -07:00

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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Utilities for slice manipulation
//!
//! The `slice` module contains useful code to help work with slice values.
//! Slices are a view into a block of memory represented as a pointer and a length.
//!
//! ```rust
//! // slicing a Vec
//! let vec = vec!(1i, 2, 3);
//! let int_slice = vec.as_slice();
//! // coercing an array to a slice
//! let str_slice: &[&str] = ["one", "two", "three"];
//! ```
//!
//! Slices are either mutable or shared. The shared slice type is `&[T]`,
//! while the mutable slice type is `&mut[T]`. For example, you can mutate the
//! block of memory that a mutable slice points to:
//!
//! ```rust
//! let x: &mut[int] = [1i, 2, 3];
//! x[1] = 7;
//! assert_eq!(x[0], 1);
//! assert_eq!(x[1], 7);
//! assert_eq!(x[2], 3);
//! ```
//!
//! Here are some of the things this module contains:
//!
//! ## Structs
//!
//! There are several structs that are useful for slices, such as `Items`, which
//! represents iteration over a slice.
//!
//! ## Traits
//!
//! A number of traits add methods that allow you to accomplish tasks with slices.
//! These traits include `ImmutableSlice`, which is defined for `&[T]` types,
//! and `MutableSlice`, defined for `&mut [T]` types.
//!
//! An example is the method `.slice(a, b)` that returns an immutable "view" into
//! a `Vec` or another slice from the index interval `[a, b)`:
//!
//! ```rust
//! let numbers = [0i, 1i, 2i];
//! let last_numbers = numbers.slice(1, 3);
//! // last_numbers is now &[1i, 2i]
//! ```
//!
//! ## Implementations of other traits
//!
//! There are several implementations of common traits for slices. Some examples
//! include:
//!
//! * `Clone`
//! * `Eq`, `Ord` - for immutable slices whose element type are `Eq` or `Ord`.
//! * `Hash` - for slices whose element type is `Hash`
//!
//! ## Iteration
//!
//! The method `iter()` returns an iteration value for a slice. The iterator
//! yields references to the slice's elements, so if the element
//! type of the slice is `int`, the element type of the iterator is `&int`.
//!
//! ```rust
//! let numbers = [0i, 1i, 2i];
//! for &x in numbers.iter() {
//! println!("{} is a number!", x);
//! }
//! ```
//!
//! * `.iter_mut()` returns an iterator that allows modifying each value.
//! * Further iterators exist that split, chunk or permute the slice.
#![doc(primitive = "slice")]
use core::cmp;
use core::mem::size_of;
use core::mem;
use core::prelude::{Clone, Collection, Greater, Iterator, Less, None, Option};
use core::prelude::{Ord, Ordering, RawPtr, Some, range};
use core::ptr;
use core::iter::{range_step, MultiplicativeIterator};
use MutableSeq;
use vec::Vec;
pub use core::slice::{Chunks, Slice, ImmutableSlice, ImmutablePartialEqSlice};
pub use core::slice::{ImmutableOrdSlice, MutableSlice, Items, MutItems};
pub use core::slice::{MutSplits, MutChunks, Splits};
pub use core::slice::{bytes, mut_ref_slice, ref_slice, MutableCloneableSlice};
pub use core::slice::{Found, NotFound};
// Functional utilities
#[allow(missing_doc)]
pub trait VectorVector<T> {
// FIXME #5898: calling these .concat and .connect conflicts with
// StrVector::con{cat,nect}, since they have generic contents.
/// Flattens a vector of vectors of `T` into a single `Vec<T>`.
fn concat_vec(&self) -> Vec<T>;
/// Concatenate a vector of vectors, placing a given separator between each.
fn connect_vec(&self, sep: &T) -> Vec<T>;
}
impl<'a, T: Clone, V: Slice<T>> VectorVector<T> for &'a [V] {
fn concat_vec(&self) -> Vec<T> {
let size = self.iter().fold(0u, |acc, v| acc + v.as_slice().len());
let mut result = Vec::with_capacity(size);
for v in self.iter() {
result.push_all(v.as_slice())
}
result
}
fn connect_vec(&self, sep: &T) -> Vec<T> {
let size = self.iter().fold(0u, |acc, v| acc + v.as_slice().len());
let mut result = Vec::with_capacity(size + self.len());
let mut first = true;
for v in self.iter() {
if first { first = false } else { result.push(sep.clone()) }
result.push_all(v.as_slice())
}
result
}
}
/// An iterator that yields the element swaps needed to produce
/// a sequence of all possible permutations for an indexed sequence of
/// elements. Each permutation is only a single swap apart.
///
/// The Steinhaus-Johnson-Trotter algorithm is used.
///
/// Generates even and odd permutations alternately.
///
/// The last generated swap is always (0, 1), and it returns the
/// sequence to its initial order.
pub struct ElementSwaps {
sdir: Vec<SizeDirection>,
/// If `true`, emit the last swap that returns the sequence to initial
/// state.
emit_reset: bool,
swaps_made : uint,
}
impl ElementSwaps {
/// Creates an `ElementSwaps` iterator for a sequence of `length` elements.
pub fn new(length: uint) -> ElementSwaps {
// Initialize `sdir` with a direction that position should move in
// (all negative at the beginning) and the `size` of the
// element (equal to the original index).
ElementSwaps{
emit_reset: true,
sdir: range(0, length).map(|i| SizeDirection{ size: i, dir: Neg }).collect(),
swaps_made: 0
}
}
}
enum Direction { Pos, Neg }
/// An `Index` and `Direction` together.
struct SizeDirection {
size: uint,
dir: Direction,
}
impl Iterator<(uint, uint)> for ElementSwaps {
#[inline]
fn next(&mut self) -> Option<(uint, uint)> {
fn new_pos(i: uint, s: Direction) -> uint {
i + match s { Pos => 1, Neg => -1 }
}
// Find the index of the largest mobile element:
// The direction should point into the vector, and the
// swap should be with a smaller `size` element.
let max = self.sdir.iter().map(|&x| x).enumerate()
.filter(|&(i, sd)|
new_pos(i, sd.dir) < self.sdir.len() &&
self.sdir[new_pos(i, sd.dir)].size < sd.size)
.max_by(|&(_, sd)| sd.size);
match max {
Some((i, sd)) => {
let j = new_pos(i, sd.dir);
self.sdir.as_mut_slice().swap(i, j);
// Swap the direction of each larger SizeDirection
for x in self.sdir.iter_mut() {
if x.size > sd.size {
x.dir = match x.dir { Pos => Neg, Neg => Pos };
}
}
self.swaps_made += 1;
Some((i, j))
},
None => if self.emit_reset {
self.emit_reset = false;
if self.sdir.len() > 1 {
// The last swap
self.swaps_made += 1;
Some((0, 1))
} else {
// Vector is of the form [] or [x], and the only permutation is itself
self.swaps_made += 1;
Some((0,0))
}
} else { None }
}
}
#[inline]
fn size_hint(&self) -> (uint, Option<uint>) {
// For a vector of size n, there are exactly n! permutations.
let n = range(2, self.sdir.len() + 1).product();
(n - self.swaps_made, Some(n - self.swaps_made))
}
}
/// An iterator that uses `ElementSwaps` to iterate through
/// all possible permutations of a vector.
///
/// The first iteration yields a clone of the vector as it is,
/// then each successive element is the vector with one
/// swap applied.
///
/// Generates even and odd permutations alternately.
pub struct Permutations<T> {
swaps: ElementSwaps,
v: Vec<T>,
}
impl<T: Clone> Iterator<Vec<T>> for Permutations<T> {
#[inline]
fn next(&mut self) -> Option<Vec<T>> {
match self.swaps.next() {
None => None,
Some((0,0)) => Some(self.v.clone()),
Some((a, b)) => {
let elt = self.v.clone();
self.v.as_mut_slice().swap(a, b);
Some(elt)
}
}
}
#[inline]
fn size_hint(&self) -> (uint, Option<uint>) {
self.swaps.size_hint()
}
}
/// Extension methods for vector slices with cloneable elements
pub trait CloneableVector<T> {
/// Copies `self` into a new `Vec`.
fn to_vec(&self) -> Vec<T>;
/// Deprecated. Use `to_vec`.
#[deprecated = "Replaced by `to_vec`"]
fn to_owned(&self) -> Vec<T> {
self.to_vec()
}
/// Converts `self` into an owned vector, not making a copy if possible.
fn into_vec(self) -> Vec<T>;
/// Deprecated. Use `into_vec`
#[deprecated = "Replaced by `into_vec`"]
fn into_owned(self) -> Vec<T> {
self.into_vec()
}
}
impl<'a, T: Clone> CloneableVector<T> for &'a [T] {
/// Returns a copy of `v`.
#[inline]
fn to_vec(&self) -> Vec<T> {
let mut vector = Vec::with_capacity(self.len());
vector.push_all(*self);
vector
}
#[inline(always)]
fn into_vec(self) -> Vec<T> { self.to_vec() }
}
/// Extension methods for vectors containing `Clone` elements.
pub trait ImmutableCloneableVector<T> {
/// Partitions the vector into two vectors `(a, b)`, where all
/// elements of `a` satisfy `f` and all elements of `b` do not.
fn partitioned(&self, f: |&T| -> bool) -> (Vec<T>, Vec<T>);
/// Creates an iterator that yields every possible permutation of the
/// vector in succession.
///
/// # Example
///
/// ```rust
/// let v = [1i, 2, 3];
/// let mut perms = v.permutations();
///
/// for p in perms {
/// println!("{}", p);
/// }
/// ```
///
/// # Example 2: iterating through permutations one by one.
///
/// ```rust
/// let v = [1i, 2, 3];
/// let mut perms = v.permutations();
///
/// assert_eq!(Some(vec![1i, 2, 3]), perms.next());
/// assert_eq!(Some(vec![1i, 3, 2]), perms.next());
/// assert_eq!(Some(vec![3i, 1, 2]), perms.next());
/// ```
fn permutations(self) -> Permutations<T>;
}
impl<'a,T:Clone> ImmutableCloneableVector<T> for &'a [T] {
#[inline]
fn partitioned(&self, f: |&T| -> bool) -> (Vec<T>, Vec<T>) {
let mut lefts = Vec::new();
let mut rights = Vec::new();
for elt in self.iter() {
if f(elt) {
lefts.push((*elt).clone());
} else {
rights.push((*elt).clone());
}
}
(lefts, rights)
}
/// Returns an iterator over all permutations of a vector.
fn permutations(self) -> Permutations<T> {
Permutations{
swaps: ElementSwaps::new(self.len()),
v: self.to_vec(),
}
}
}
fn insertion_sort<T>(v: &mut [T], compare: |&T, &T| -> Ordering) {
let len = v.len() as int;
let buf_v = v.as_mut_ptr();
// 1 <= i < len;
for i in range(1, len) {
// j satisfies: 0 <= j <= i;
let mut j = i;
unsafe {
// `i` is in bounds.
let read_ptr = buf_v.offset(i) as *const T;
// find where to insert, we need to do strict <,
// rather than <=, to maintain stability.
// 0 <= j - 1 < len, so .offset(j - 1) is in bounds.
while j > 0 &&
compare(&*read_ptr, &*buf_v.offset(j - 1)) == Less {
j -= 1;
}
// shift everything to the right, to make space to
// insert this value.
// j + 1 could be `len` (for the last `i`), but in
// that case, `i == j` so we don't copy. The
// `.offset(j)` is always in bounds.
if i != j {
let tmp = ptr::read(read_ptr);
ptr::copy_memory(buf_v.offset(j + 1),
&*buf_v.offset(j),
(i - j) as uint);
ptr::copy_nonoverlapping_memory(buf_v.offset(j),
&tmp as *const T,
1);
mem::forget(tmp);
}
}
}
}
fn merge_sort<T>(v: &mut [T], compare: |&T, &T| -> Ordering) {
// warning: this wildly uses unsafe.
static BASE_INSERTION: uint = 32;
static LARGE_INSERTION: uint = 16;
// FIXME #12092: smaller insertion runs seems to make sorting
// vectors of large elements a little faster on some platforms,
// but hasn't been tested/tuned extensively
let insertion = if size_of::<T>() <= 16 {
BASE_INSERTION
} else {
LARGE_INSERTION
};
let len = v.len();
// short vectors get sorted in-place via insertion sort to avoid allocations
if len <= insertion {
insertion_sort(v, compare);
return;
}
// allocate some memory to use as scratch memory, we keep the
// length 0 so we can keep shallow copies of the contents of `v`
// without risking the dtors running on an object twice if
// `compare` fails.
let mut working_space = Vec::with_capacity(2 * len);
// these both are buffers of length `len`.
let mut buf_dat = working_space.as_mut_ptr();
let mut buf_tmp = unsafe {buf_dat.offset(len as int)};
// length `len`.
let buf_v = v.as_ptr();
// step 1. sort short runs with insertion sort. This takes the
// values from `v` and sorts them into `buf_dat`, leaving that
// with sorted runs of length INSERTION.
// We could hardcode the sorting comparisons here, and we could
// manipulate/step the pointers themselves, rather than repeatedly
// .offset-ing.
for start in range_step(0, len, insertion) {
// start <= i < len;
for i in range(start, cmp::min(start + insertion, len)) {
// j satisfies: start <= j <= i;
let mut j = i as int;
unsafe {
// `i` is in bounds.
let read_ptr = buf_v.offset(i as int);
// find where to insert, we need to do strict <,
// rather than <=, to maintain stability.
// start <= j - 1 < len, so .offset(j - 1) is in
// bounds.
while j > start as int &&
compare(&*read_ptr, &*buf_dat.offset(j - 1)) == Less {
j -= 1;
}
// shift everything to the right, to make space to
// insert this value.
// j + 1 could be `len` (for the last `i`), but in
// that case, `i == j` so we don't copy. The
// `.offset(j)` is always in bounds.
ptr::copy_memory(buf_dat.offset(j + 1),
&*buf_dat.offset(j),
i - j as uint);
ptr::copy_nonoverlapping_memory(buf_dat.offset(j), read_ptr, 1);
}
}
}
// step 2. merge the sorted runs.
let mut width = insertion;
while width < len {
// merge the sorted runs of length `width` in `buf_dat` two at
// a time, placing the result in `buf_tmp`.
// 0 <= start <= len.
for start in range_step(0, len, 2 * width) {
// manipulate pointers directly for speed (rather than
// using a `for` loop with `range` and `.offset` inside
// that loop).
unsafe {
// the end of the first run & start of the
// second. Offset of `len` is defined, since this is
// precisely one byte past the end of the object.
let right_start = buf_dat.offset(cmp::min(start + width, len) as int);
// end of the second. Similar reasoning to the above re safety.
let right_end_idx = cmp::min(start + 2 * width, len);
let right_end = buf_dat.offset(right_end_idx as int);
// the pointers to the elements under consideration
// from the two runs.
// both of these are in bounds.
let mut left = buf_dat.offset(start as int);
let mut right = right_start;
// where we're putting the results, it is a run of
// length `2*width`, so we step it once for each step
// of either `left` or `right`. `buf_tmp` has length
// `len`, so these are in bounds.
let mut out = buf_tmp.offset(start as int);
let out_end = buf_tmp.offset(right_end_idx as int);
while out < out_end {
// Either the left or the right run are exhausted,
// so just copy the remainder from the other run
// and move on; this gives a huge speed-up (order
// of 25%) for mostly sorted vectors (the best
// case).
if left == right_start {
// the number remaining in this run.
let elems = (right_end as uint - right as uint) / mem::size_of::<T>();
ptr::copy_nonoverlapping_memory(out, &*right, elems);
break;
} else if right == right_end {
let elems = (right_start as uint - left as uint) / mem::size_of::<T>();
ptr::copy_nonoverlapping_memory(out, &*left, elems);
break;
}
// check which side is smaller, and that's the
// next element for the new run.
// `left < right_start` and `right < right_end`,
// so these are valid.
let to_copy = if compare(&*left, &*right) == Greater {
step(&mut right)
} else {
step(&mut left)
};
ptr::copy_nonoverlapping_memory(out, &*to_copy, 1);
step(&mut out);
}
}
}
mem::swap(&mut buf_dat, &mut buf_tmp);
width *= 2;
}
// write the result to `v` in one go, so that there are never two copies
// of the same object in `v`.
unsafe {
ptr::copy_nonoverlapping_memory(v.as_mut_ptr(), &*buf_dat, len);
}
// increment the pointer, returning the old pointer.
#[inline(always)]
unsafe fn step<T>(ptr: &mut *mut T) -> *mut T {
let old = *ptr;
*ptr = ptr.offset(1);
old
}
}
/// Extension methods for vectors such that their elements are
/// mutable.
pub trait MutableSliceAllocating<'a, T> {
/// Sorts the slice, in place, using `compare` to compare
/// elements.
///
/// This sort is `O(n log n)` worst-case and stable, but allocates
/// approximately `2 * n`, where `n` is the length of `self`.
///
/// # Example
///
/// ```rust
/// let mut v = [5i, 4, 1, 3, 2];
/// v.sort_by(|a, b| a.cmp(b));
/// assert!(v == [1, 2, 3, 4, 5]);
///
/// // reverse sorting
/// v.sort_by(|a, b| b.cmp(a));
/// assert!(v == [5, 4, 3, 2, 1]);
/// ```
fn sort_by(self, compare: |&T, &T| -> Ordering);
/// Consumes `src` and moves as many elements as it can into `self`
/// from the range [start,end).
///
/// Returns the number of elements copied (the shorter of `self.len()`
/// and `end - start`).
///
/// # Arguments
///
/// * src - A mutable vector of `T`
/// * start - The index into `src` to start copying from
/// * end - The index into `src` to stop copying from
///
/// # Example
///
/// ```rust
/// let mut a = [1i, 2, 3, 4, 5];
/// let b = vec![6i, 7, 8];
/// let num_moved = a.move_from(b, 0, 3);
/// assert_eq!(num_moved, 3);
/// assert!(a == [6i, 7, 8, 4, 5]);
/// ```
fn move_from(self, src: Vec<T>, start: uint, end: uint) -> uint;
}
impl<'a,T> MutableSliceAllocating<'a, T> for &'a mut [T] {
#[inline]
fn sort_by(self, compare: |&T, &T| -> Ordering) {
merge_sort(self, compare)
}
#[inline]
fn move_from(self, mut src: Vec<T>, start: uint, end: uint) -> uint {
for (a, b) in self.iter_mut().zip(src.slice_mut(start, end).iter_mut()) {
mem::swap(a, b);
}
cmp::min(self.len(), end-start)
}
}
/// Methods for mutable vectors with orderable elements, such as
/// in-place sorting.
pub trait MutableOrdSlice<T> {
/// Sorts the slice, in place.
///
/// This is equivalent to `self.sort_by(|a, b| a.cmp(b))`.
///
/// # Example
///
/// ```rust
/// let mut v = [-5i, 4, 1, -3, 2];
///
/// v.sort();
/// assert!(v == [-5i, -3, 1, 2, 4]);
/// ```
fn sort(self);
/// Mutates the slice to the next lexicographic permutation.
///
/// Returns `true` if successful and `false` if the slice is at the
/// last-ordered permutation.
///
/// # Example
///
/// ```rust
/// let v: &mut [_] = &mut [0i, 1, 2];
/// v.next_permutation();
/// let b: &mut [_] = &mut [0i, 2, 1];
/// assert!(v == b);
/// v.next_permutation();
/// let b: &mut [_] = &mut [1i, 0, 2];
/// assert!(v == b);
/// ```
fn next_permutation(self) -> bool;
/// Mutates the slice to the previous lexicographic permutation.
///
/// Returns `true` if successful and `false` if the slice is at the
/// first-ordered permutation.
///
/// # Example
///
/// ```rust
/// let v: &mut [_] = &mut [1i, 0, 2];
/// v.prev_permutation();
/// let b: &mut [_] = &mut [0i, 2, 1];
/// assert!(v == b);
/// v.prev_permutation();
/// let b: &mut [_] = &mut [0i, 1, 2];
/// assert!(v == b);
/// ```
fn prev_permutation(self) -> bool;
}
impl<'a, T: Ord> MutableOrdSlice<T> for &'a mut [T] {
#[inline]
fn sort(self) {
self.sort_by(|a,b| a.cmp(b))
}
fn next_permutation(self) -> bool {
// These cases only have 1 permutation each, so we can't do anything.
if self.len() < 2 { return false; }
// Step 1: Identify the longest, rightmost weakly decreasing part of the vector
let mut i = self.len() - 1;
while i > 0 && self[i-1] >= self[i] {
i -= 1;
}
// If that is the entire vector, this is the last-ordered permutation.
if i == 0 {
return false;
}
// Step 2: Find the rightmost element larger than the pivot (i-1)
let mut j = self.len() - 1;
while j >= i && self[j] <= self[i-1] {
j -= 1;
}
// Step 3: Swap that element with the pivot
self.swap(j, i-1);
// Step 4: Reverse the (previously) weakly decreasing part
self.slice_from_mut(i).reverse();
true
}
fn prev_permutation(self) -> bool {
// These cases only have 1 permutation each, so we can't do anything.
if self.len() < 2 { return false; }
// Step 1: Identify the longest, rightmost weakly increasing part of the vector
let mut i = self.len() - 1;
while i > 0 && self[i-1] <= self[i] {
i -= 1;
}
// If that is the entire vector, this is the first-ordered permutation.
if i == 0 {
return false;
}
// Step 2: Reverse the weakly increasing part
self.slice_from_mut(i).reverse();
// Step 3: Find the rightmost element equal to or bigger than the pivot (i-1)
let mut j = self.len() - 1;
while j >= i && self[j-1] < self[i-1] {
j -= 1;
}
// Step 4: Swap that element with the pivot
self.swap(i-1, j);
true
}
}
/// Unsafe operations
pub mod raw {
pub use core::slice::raw::{buf_as_slice, mut_buf_as_slice};
pub use core::slice::raw::{shift_ptr, pop_ptr};
}
#[cfg(test)]
mod tests {
use std::cell::Cell;
use std::default::Default;
use std::mem;
use std::prelude::*;
use std::rand::{Rng, task_rng};
use std::rc::Rc;
use std::rt;
use slice::*;
use {Mutable, MutableSeq};
use vec::Vec;
fn square(n: uint) -> uint { n * n }
fn is_odd(n: &uint) -> bool { *n % 2u == 1u }
#[test]
fn test_from_fn() {
// Test on-stack from_fn.
let mut v = Vec::from_fn(3u, square);
{
let v = v.as_slice();
assert_eq!(v.len(), 3u);
assert_eq!(v[0], 0u);
assert_eq!(v[1], 1u);
assert_eq!(v[2], 4u);
}
// Test on-heap from_fn.
v = Vec::from_fn(5u, square);
{
let v = v.as_slice();
assert_eq!(v.len(), 5u);
assert_eq!(v[0], 0u);
assert_eq!(v[1], 1u);
assert_eq!(v[2], 4u);
assert_eq!(v[3], 9u);
assert_eq!(v[4], 16u);
}
}
#[test]
fn test_from_elem() {
// Test on-stack from_elem.
let mut v = Vec::from_elem(2u, 10u);
{
let v = v.as_slice();
assert_eq!(v.len(), 2u);
assert_eq!(v[0], 10u);
assert_eq!(v[1], 10u);
}
// Test on-heap from_elem.
v = Vec::from_elem(6u, 20u);
{
let v = v.as_slice();
assert_eq!(v[0], 20u);
assert_eq!(v[1], 20u);
assert_eq!(v[2], 20u);
assert_eq!(v[3], 20u);
assert_eq!(v[4], 20u);
assert_eq!(v[5], 20u);
}
}
#[test]
fn test_is_empty() {
let xs: [int, ..0] = [];
assert!(xs.is_empty());
assert!(![0i].is_empty());
}
#[test]
fn test_len_divzero() {
type Z = [i8, ..0];
let v0 : &[Z] = &[];
let v1 : &[Z] = &[[]];
let v2 : &[Z] = &[[], []];
assert_eq!(mem::size_of::<Z>(), 0);
assert_eq!(v0.len(), 0);
assert_eq!(v1.len(), 1);
assert_eq!(v2.len(), 2);
}
#[test]
fn test_get() {
let mut a = vec![11i];
assert_eq!(a.as_slice().get(1), None);
a = vec![11i, 12];
assert_eq!(a.as_slice().get(1).unwrap(), &12);
a = vec![11i, 12, 13];
assert_eq!(a.as_slice().get(1).unwrap(), &12);
}
#[test]
fn test_head() {
let mut a = vec![];
assert_eq!(a.as_slice().head(), None);
a = vec![11i];
assert_eq!(a.as_slice().head().unwrap(), &11);
a = vec![11i, 12];
assert_eq!(a.as_slice().head().unwrap(), &11);
}
#[test]
fn test_head_mut() {
let mut a = vec![];
assert_eq!(a.as_mut_slice().head_mut(), None);
a = vec![11i];
assert_eq!(*a.as_mut_slice().head_mut().unwrap(), 11);
a = vec![11i, 12];
assert_eq!(*a.as_mut_slice().head_mut().unwrap(), 11);
}
#[test]
fn test_tail() {
let mut a = vec![11i];
let b: &[int] = &[];
assert_eq!(a.tail(), b);
a = vec![11i, 12];
let b: &[int] = &[12];
assert_eq!(a.tail(), b);
}
#[test]
fn test_tail_mut() {
let mut a = vec![11i];
let b: &mut [int] = &mut [];
assert!(a.as_mut_slice().tail_mut() == b);
a = vec![11i, 12];
let b: &mut [int] = &mut [12];
assert!(a.as_mut_slice().tail_mut() == b);
}
#[test]
#[should_fail]
fn test_tail_empty() {
let a: Vec<int> = vec![];
a.tail();
}
#[test]
#[should_fail]
fn test_tail_mut_empty() {
let mut a: Vec<int> = vec![];
a.as_mut_slice().tail_mut();
}
#[test]
#[allow(deprecated)]
fn test_tailn() {
let mut a = vec![11i, 12, 13];
let b: &mut [int] = &mut [11, 12, 13];
assert!(a.tailn(0) == b);
a = vec![11i, 12, 13];
let b: &mut [int] = &mut [13];
assert!(a.tailn(2) == b);
}
#[test]
#[should_fail]
#[allow(deprecated)]
fn test_tailn_empty() {
let a: Vec<int> = vec![];
a.tailn(2);
}
#[test]
fn test_init() {
let mut a = vec![11i];
let b: &[int] = &[];
assert_eq!(a.init(), b);
a = vec![11i, 12];
let b: &[int] = &[11];
assert_eq!(a.init(), b);
}
#[test]
fn test_init_mut() {
let mut a = vec![11i];
let b: &mut [int] = &mut [];
assert!(a.as_mut_slice().init_mut() == b);
a = vec![11i, 12];
let b: &mut [int] = &mut [11];
assert!(a.as_mut_slice().init_mut() == b);
}
#[test]
#[should_fail]
fn test_init_empty() {
let a: Vec<int> = vec![];
a.init();
}
#[test]
#[should_fail]
fn test_init_mut_empty() {
let mut a: Vec<int> = vec![];
a.as_mut_slice().init_mut();
}
#[test]
#[allow(deprecated)]
fn test_initn() {
let mut a = vec![11i, 12, 13];
let b: &[int] = &[11, 12, 13];
assert_eq!(a.as_slice().initn(0), b);
a = vec![11i, 12, 13];
let b: &[int] = &[11];
assert_eq!(a.as_slice().initn(2), b);
}
#[test]
#[should_fail]
#[allow(deprecated)]
fn test_initn_empty() {
let a: Vec<int> = vec![];
a.as_slice().initn(2);
}
#[test]
fn test_last() {
let mut a = vec![];
assert_eq!(a.as_slice().last(), None);
a = vec![11i];
assert_eq!(a.as_slice().last().unwrap(), &11);
a = vec![11i, 12];
assert_eq!(a.as_slice().last().unwrap(), &12);
}
#[test]
fn test_last_mut() {
let mut a = vec![];
assert_eq!(a.as_mut_slice().last_mut(), None);
a = vec![11i];
assert_eq!(*a.as_mut_slice().last_mut().unwrap(), 11);
a = vec![11i, 12];
assert_eq!(*a.as_mut_slice().last_mut().unwrap(), 12);
}
#[test]
fn test_slice() {
// Test fixed length vector.
let vec_fixed = [1i, 2, 3, 4];
let v_a = vec_fixed.slice(1u, vec_fixed.len()).to_vec();
assert_eq!(v_a.len(), 3u);
let v_a = v_a.as_slice();
assert_eq!(v_a[0], 2);
assert_eq!(v_a[1], 3);
assert_eq!(v_a[2], 4);
// Test on stack.
let vec_stack = &[1i, 2, 3];
let v_b = vec_stack.slice(1u, 3u).to_vec();
assert_eq!(v_b.len(), 2u);
let v_b = v_b.as_slice();
assert_eq!(v_b[0], 2);
assert_eq!(v_b[1], 3);
// Test `Box<[T]>`
let vec_unique = vec![1i, 2, 3, 4, 5, 6];
let v_d = vec_unique.slice(1u, 6u).to_vec();
assert_eq!(v_d.len(), 5u);
let v_d = v_d.as_slice();
assert_eq!(v_d[0], 2);
assert_eq!(v_d[1], 3);
assert_eq!(v_d[2], 4);
assert_eq!(v_d[3], 5);
assert_eq!(v_d[4], 6);
}
#[test]
fn test_slice_from() {
let vec: &[int] = &[1, 2, 3, 4];
assert_eq!(vec.slice_from(0), vec);
let b: &[int] = &[3, 4];
assert_eq!(vec.slice_from(2), b);
let b: &[int] = &[];
assert_eq!(vec.slice_from(4), b);
}
#[test]
fn test_slice_to() {
let vec: &[int] = &[1, 2, 3, 4];
assert_eq!(vec.slice_to(4), vec);
let b: &[int] = &[1, 2];
assert_eq!(vec.slice_to(2), b);
let b: &[int] = &[];
assert_eq!(vec.slice_to(0), b);
}
#[test]
fn test_pop() {
let mut v = vec![5i];
let e = v.pop();
assert_eq!(v.len(), 0);
assert_eq!(e, Some(5));
let f = v.pop();
assert_eq!(f, None);
let g = v.pop();
assert_eq!(g, None);
}
#[test]
fn test_swap_remove() {
let mut v = vec![1i, 2, 3, 4, 5];
let mut e = v.swap_remove(0);
assert_eq!(e, Some(1));
assert_eq!(v, vec![5i, 2, 3, 4]);
e = v.swap_remove(3);
assert_eq!(e, Some(4));
assert_eq!(v, vec![5i, 2, 3]);
e = v.swap_remove(3);
assert_eq!(e, None);
assert_eq!(v, vec![5i, 2, 3]);
}
#[test]
fn test_swap_remove_noncopyable() {
// Tests that we don't accidentally run destructors twice.
let mut v = vec![rt::exclusive::Exclusive::new(()),
rt::exclusive::Exclusive::new(()),
rt::exclusive::Exclusive::new(())];
let mut _e = v.swap_remove(0);
assert_eq!(v.len(), 2);
_e = v.swap_remove(1);
assert_eq!(v.len(), 1);
_e = v.swap_remove(0);
assert_eq!(v.len(), 0);
}
#[test]
fn test_push() {
// Test on-stack push().
let mut v = vec![];
v.push(1i);
assert_eq!(v.len(), 1u);
assert_eq!(v.as_slice()[0], 1);
// Test on-heap push().
v.push(2i);
assert_eq!(v.len(), 2u);
assert_eq!(v.as_slice()[0], 1);
assert_eq!(v.as_slice()[1], 2);
}
#[test]
fn test_grow() {
// Test on-stack grow().
let mut v = vec![];
v.grow(2u, 1i);
{
let v = v.as_slice();
assert_eq!(v.len(), 2u);
assert_eq!(v[0], 1);
assert_eq!(v[1], 1);
}
// Test on-heap grow().
v.grow(3u, 2i);
{
let v = v.as_slice();
assert_eq!(v.len(), 5u);
assert_eq!(v[0], 1);
assert_eq!(v[1], 1);
assert_eq!(v[2], 2);
assert_eq!(v[3], 2);
assert_eq!(v[4], 2);
}
}
#[test]
fn test_grow_fn() {
let mut v = vec![];
v.grow_fn(3u, square);
let v = v.as_slice();
assert_eq!(v.len(), 3u);
assert_eq!(v[0], 0u);
assert_eq!(v[1], 1u);
assert_eq!(v[2], 4u);
}
#[test]
#[allow(deprecated)]
fn test_grow_set() {
let mut v = vec![1i, 2, 3];
v.grow_set(4u, &4, 5);
let v = v.as_slice();
assert_eq!(v.len(), 5u);
assert_eq!(v[0], 1);
assert_eq!(v[1], 2);
assert_eq!(v[2], 3);
assert_eq!(v[3], 4);
assert_eq!(v[4], 5);
}
#[test]
fn test_truncate() {
let mut v = vec![box 6i,box 5,box 4];
v.truncate(1);
let v = v.as_slice();
assert_eq!(v.len(), 1);
assert_eq!(*(v[0]), 6);
// If the unsafe block didn't drop things properly, we blow up here.
}
#[test]
fn test_clear() {
let mut v = vec![box 6i,box 5,box 4];
v.clear();
assert_eq!(v.len(), 0);
// If the unsafe block didn't drop things properly, we blow up here.
}
#[test]
fn test_dedup() {
fn case(a: Vec<uint>, b: Vec<uint>) {
let mut v = a;
v.dedup();
assert_eq!(v, b);
}
case(vec![], vec![]);
case(vec![1u], vec![1]);
case(vec![1u,1], vec![1]);
case(vec![1u,2,3], vec![1,2,3]);
case(vec![1u,1,2,3], vec![1,2,3]);
case(vec![1u,2,2,3], vec![1,2,3]);
case(vec![1u,2,3,3], vec![1,2,3]);
case(vec![1u,1,2,2,2,3,3], vec![1,2,3]);
}
#[test]
fn test_dedup_unique() {
let mut v0 = vec![box 1i, box 1, box 2, box 3];
v0.dedup();
let mut v1 = vec![box 1i, box 2, box 2, box 3];
v1.dedup();
let mut v2 = vec![box 1i, box 2, box 3, box 3];
v2.dedup();
/*
* If the boxed pointers were leaked or otherwise misused, valgrind
* and/or rustrt should raise errors.
*/
}
#[test]
fn test_dedup_shared() {
let mut v0 = vec![box 1i, box 1, box 2, box 3];
v0.dedup();
let mut v1 = vec![box 1i, box 2, box 2, box 3];
v1.dedup();
let mut v2 = vec![box 1i, box 2, box 3, box 3];
v2.dedup();
/*
* If the pointers were leaked or otherwise misused, valgrind and/or
* rustrt should raise errors.
*/
}
#[test]
fn test_retain() {
let mut v = vec![1u, 2, 3, 4, 5];
v.retain(is_odd);
assert_eq!(v, vec![1u, 3, 5]);
}
#[test]
fn test_element_swaps() {
let mut v = [1i, 2, 3];
for (i, (a, b)) in ElementSwaps::new(v.len()).enumerate() {
v.swap(a, b);
match i {
0 => assert!(v == [1, 3, 2]),
1 => assert!(v == [3, 1, 2]),
2 => assert!(v == [3, 2, 1]),
3 => assert!(v == [2, 3, 1]),
4 => assert!(v == [2, 1, 3]),
5 => assert!(v == [1, 2, 3]),
_ => fail!(),
}
}
}
#[test]
fn test_permutations() {
{
let v: [int, ..0] = [];
let mut it = v.permutations();
let (min_size, max_opt) = it.size_hint();
assert_eq!(min_size, 1);
assert_eq!(max_opt.unwrap(), 1);
assert_eq!(it.next(), Some(v.as_slice().to_vec()));
assert_eq!(it.next(), None);
}
{
let v = ["Hello".to_string()];
let mut it = v.permutations();
let (min_size, max_opt) = it.size_hint();
assert_eq!(min_size, 1);
assert_eq!(max_opt.unwrap(), 1);
assert_eq!(it.next(), Some(v.as_slice().to_vec()));
assert_eq!(it.next(), None);
}
{
let v = [1i, 2, 3];
let mut it = v.permutations();
let (min_size, max_opt) = it.size_hint();
assert_eq!(min_size, 3*2);
assert_eq!(max_opt.unwrap(), 3*2);
assert_eq!(it.next(), Some(vec![1,2,3]));
assert_eq!(it.next(), Some(vec![1,3,2]));
assert_eq!(it.next(), Some(vec![3,1,2]));
let (min_size, max_opt) = it.size_hint();
assert_eq!(min_size, 3);
assert_eq!(max_opt.unwrap(), 3);
assert_eq!(it.next(), Some(vec![3,2,1]));
assert_eq!(it.next(), Some(vec![2,3,1]));
assert_eq!(it.next(), Some(vec![2,1,3]));
assert_eq!(it.next(), None);
}
{
// check that we have N! permutations
let v = ['A', 'B', 'C', 'D', 'E', 'F'];
let mut amt = 0;
let mut it = v.permutations();
let (min_size, max_opt) = it.size_hint();
for _perm in it {
amt += 1;
}
assert_eq!(amt, it.swaps.swaps_made);
assert_eq!(amt, min_size);
assert_eq!(amt, 2 * 3 * 4 * 5 * 6);
assert_eq!(amt, max_opt.unwrap());
}
}
#[test]
fn test_lexicographic_permutations() {
let v : &mut[int] = &mut[1i, 2, 3, 4, 5];
assert!(v.prev_permutation() == false);
assert!(v.next_permutation());
let b: &mut[int] = &mut[1, 2, 3, 5, 4];
assert!(v == b);
assert!(v.prev_permutation());
let b: &mut[int] = &mut[1, 2, 3, 4, 5];
assert!(v == b);
assert!(v.next_permutation());
assert!(v.next_permutation());
let b: &mut[int] = &mut[1, 2, 4, 3, 5];
assert!(v == b);
assert!(v.next_permutation());
let b: &mut[int] = &mut[1, 2, 4, 5, 3];
assert!(v == b);
let v : &mut[int] = &mut[1i, 0, 0, 0];
assert!(v.next_permutation() == false);
assert!(v.prev_permutation());
let b: &mut[int] = &mut[0, 1, 0, 0];
assert!(v == b);
assert!(v.prev_permutation());
let b: &mut[int] = &mut[0, 0, 1, 0];
assert!(v == b);
assert!(v.prev_permutation());
let b: &mut[int] = &mut[0, 0, 0, 1];
assert!(v == b);
assert!(v.prev_permutation() == false);
}
#[test]
fn test_lexicographic_permutations_empty_and_short() {
let empty : &mut[int] = &mut[];
assert!(empty.next_permutation() == false);
let b: &mut[int] = &mut[];
assert!(empty == b);
assert!(empty.prev_permutation() == false);
assert!(empty == b);
let one_elem : &mut[int] = &mut[4i];
assert!(one_elem.prev_permutation() == false);
let b: &mut[int] = &mut[4];
assert!(one_elem == b);
assert!(one_elem.next_permutation() == false);
assert!(one_elem == b);
let two_elem : &mut[int] = &mut[1i, 2];
assert!(two_elem.prev_permutation() == false);
let b : &mut[int] = &mut[1, 2];
let c : &mut[int] = &mut[2, 1];
assert!(two_elem == b);
assert!(two_elem.next_permutation());
assert!(two_elem == c);
assert!(two_elem.next_permutation() == false);
assert!(two_elem == c);
assert!(two_elem.prev_permutation());
assert!(two_elem == b);
assert!(two_elem.prev_permutation() == false);
assert!(two_elem == b);
}
#[test]
fn test_position_elem() {
assert!([].position_elem(&1i).is_none());
let v1 = vec![1i, 2, 3, 3, 2, 5];
assert_eq!(v1.as_slice().position_elem(&1), Some(0u));
assert_eq!(v1.as_slice().position_elem(&2), Some(1u));
assert_eq!(v1.as_slice().position_elem(&5), Some(5u));
assert!(v1.as_slice().position_elem(&4).is_none());
}
#[test]
#[allow(deprecated)]
fn test_bsearch_elem() {
assert_eq!([1i,2,3,4,5].bsearch_elem(&5), Some(4));
assert_eq!([1i,2,3,4,5].bsearch_elem(&4), Some(3));
assert_eq!([1i,2,3,4,5].bsearch_elem(&3), Some(2));
assert_eq!([1i,2,3,4,5].bsearch_elem(&2), Some(1));
assert_eq!([1i,2,3,4,5].bsearch_elem(&1), Some(0));
assert_eq!([2i,4,6,8,10].bsearch_elem(&1), None);
assert_eq!([2i,4,6,8,10].bsearch_elem(&5), None);
assert_eq!([2i,4,6,8,10].bsearch_elem(&4), Some(1));
assert_eq!([2i,4,6,8,10].bsearch_elem(&10), Some(4));
assert_eq!([2i,4,6,8].bsearch_elem(&1), None);
assert_eq!([2i,4,6,8].bsearch_elem(&5), None);
assert_eq!([2i,4,6,8].bsearch_elem(&4), Some(1));
assert_eq!([2i,4,6,8].bsearch_elem(&8), Some(3));
assert_eq!([2i,4,6].bsearch_elem(&1), None);
assert_eq!([2i,4,6].bsearch_elem(&5), None);
assert_eq!([2i,4,6].bsearch_elem(&4), Some(1));
assert_eq!([2i,4,6].bsearch_elem(&6), Some(2));
assert_eq!([2i,4].bsearch_elem(&1), None);
assert_eq!([2i,4].bsearch_elem(&5), None);
assert_eq!([2i,4].bsearch_elem(&2), Some(0));
assert_eq!([2i,4].bsearch_elem(&4), Some(1));
assert_eq!([2i].bsearch_elem(&1), None);
assert_eq!([2i].bsearch_elem(&5), None);
assert_eq!([2i].bsearch_elem(&2), Some(0));
assert_eq!([].bsearch_elem(&1i), None);
assert_eq!([].bsearch_elem(&5i), None);
assert!([1i,1,1,1,1].bsearch_elem(&1) != None);
assert!([1i,1,1,1,2].bsearch_elem(&1) != None);
assert!([1i,1,1,2,2].bsearch_elem(&1) != None);
assert!([1i,1,2,2,2].bsearch_elem(&1) != None);
assert_eq!([1i,2,2,2,2].bsearch_elem(&1), Some(0));
assert_eq!([1i,2,3,4,5].bsearch_elem(&6), None);
assert_eq!([1i,2,3,4,5].bsearch_elem(&0), None);
}
#[test]
fn test_reverse() {
let mut v: Vec<int> = vec![10i, 20];
assert_eq!(v[0], 10);
assert_eq!(v[1], 20);
v.reverse();
assert_eq!(v[0], 20);
assert_eq!(v[1], 10);
let mut v3: Vec<int> = vec![];
v3.reverse();
assert!(v3.is_empty());
}
#[test]
fn test_sort() {
for len in range(4u, 25) {
for _ in range(0i, 100) {
let mut v = task_rng().gen_iter::<uint>().take(len)
.collect::<Vec<uint>>();
let mut v1 = v.clone();
v.as_mut_slice().sort();
assert!(v.as_slice().windows(2).all(|w| w[0] <= w[1]));
v1.as_mut_slice().sort_by(|a, b| a.cmp(b));
assert!(v1.as_slice().windows(2).all(|w| w[0] <= w[1]));
v1.as_mut_slice().sort_by(|a, b| b.cmp(a));
assert!(v1.as_slice().windows(2).all(|w| w[0] >= w[1]));
}
}
// shouldn't fail/crash
let mut v: [uint, .. 0] = [];
v.sort();
let mut v = [0xDEADBEEFu];
v.sort();
assert!(v == [0xDEADBEEF]);
}
#[test]
fn test_sort_stability() {
for len in range(4i, 25) {
for _ in range(0u, 10) {
let mut counts = [0i, .. 10];
// create a vector like [(6, 1), (5, 1), (6, 2), ...],
// where the first item of each tuple is random, but
// the second item represents which occurrence of that
// number this element is, i.e. the second elements
// will occur in sorted order.
let mut v = range(0, len).map(|_| {
let n = task_rng().gen::<uint>() % 10;
counts[n] += 1;
(n, counts[n])
}).collect::<Vec<(uint, int)>>();
// only sort on the first element, so an unstable sort
// may mix up the counts.
v.sort_by(|&(a,_), &(b,_)| a.cmp(&b));
// this comparison includes the count (the second item
// of the tuple), so elements with equal first items
// will need to be ordered with increasing
// counts... i.e. exactly asserting that this sort is
// stable.
assert!(v.as_slice().windows(2).all(|w| w[0] <= w[1]));
}
}
}
#[test]
fn test_partition() {
assert_eq!((vec![]).partition(|x: &int| *x < 3), (vec![], vec![]));
assert_eq!((vec![1i, 2, 3]).partition(|x: &int| *x < 4), (vec![1, 2, 3], vec![]));
assert_eq!((vec![1i, 2, 3]).partition(|x: &int| *x < 2), (vec![1], vec![2, 3]));
assert_eq!((vec![1i, 2, 3]).partition(|x: &int| *x < 0), (vec![], vec![1, 2, 3]));
}
#[test]
fn test_partitioned() {
assert_eq!(([]).partitioned(|x: &int| *x < 3), (vec![], vec![]));
assert_eq!(([1i, 2, 3]).partitioned(|x: &int| *x < 4), (vec![1, 2, 3], vec![]));
assert_eq!(([1i, 2, 3]).partitioned(|x: &int| *x < 2), (vec![1], vec![2, 3]));
assert_eq!(([1i, 2, 3]).partitioned(|x: &int| *x < 0), (vec![], vec![1, 2, 3]));
}
#[test]
fn test_concat() {
let v: [Vec<int>, ..0] = [];
assert_eq!(v.concat_vec(), vec![]);
assert_eq!([vec![1i], vec![2i,3i]].concat_vec(), vec![1, 2, 3]);
let v: [&[int], ..2] = [&[1], &[2, 3]];
assert_eq!(v.connect_vec(&0), vec![1, 0, 2, 3]);
let v: [&[int], ..3] = [&[1], &[2], &[3]];
assert_eq!(v.connect_vec(&0), vec![1, 0, 2, 0, 3]);
}
#[test]
fn test_connect() {
let v: [Vec<int>, ..0] = [];
assert_eq!(v.connect_vec(&0), vec![]);
assert_eq!([vec![1i], vec![2i, 3]].connect_vec(&0), vec![1, 0, 2, 3]);
assert_eq!([vec![1i], vec![2i], vec![3i]].connect_vec(&0), vec![1, 0, 2, 0, 3]);
let v: [&[int], ..2] = [&[1], &[2, 3]];
assert_eq!(v.connect_vec(&0), vec![1, 0, 2, 3]);
let v: [&[int], ..3] = [&[1], &[2], &[3]];
assert_eq!(v.connect_vec(&0), vec![1, 0, 2, 0, 3]);
}
#[test]
#[allow(deprecated)]
fn test_shift() {
let mut x = vec![1i, 2, 3];
assert_eq!(x.shift(), Some(1));
assert_eq!(&x, &vec![2i, 3]);
assert_eq!(x.shift(), Some(2));
assert_eq!(x.shift(), Some(3));
assert_eq!(x.shift(), None);
assert_eq!(x.len(), 0);
}
#[test]
#[allow(deprecated)]
fn test_unshift() {
let mut x = vec![1i, 2, 3];
x.unshift(0);
assert_eq!(x, vec![0, 1, 2, 3]);
}
#[test]
fn test_insert() {
let mut a = vec![1i, 2, 4];
a.insert(2, 3);
assert_eq!(a, vec![1, 2, 3, 4]);
let mut a = vec![1i, 2, 3];
a.insert(0, 0);
assert_eq!(a, vec![0, 1, 2, 3]);
let mut a = vec![1i, 2, 3];
a.insert(3, 4);
assert_eq!(a, vec![1, 2, 3, 4]);
let mut a = vec![];
a.insert(0, 1i);
assert_eq!(a, vec![1]);
}
#[test]
#[should_fail]
fn test_insert_oob() {
let mut a = vec![1i, 2, 3];
a.insert(4, 5);
}
#[test]
fn test_remove() {
let mut a = vec![1i,2,3,4];
assert_eq!(a.remove(2), Some(3));
assert_eq!(a, vec![1i,2,4]);
assert_eq!(a.remove(2), Some(4));
assert_eq!(a, vec![1i,2]);
assert_eq!(a.remove(2), None);
assert_eq!(a, vec![1i,2]);
assert_eq!(a.remove(0), Some(1));
assert_eq!(a, vec![2i]);
assert_eq!(a.remove(0), Some(2));
assert_eq!(a, vec![]);
assert_eq!(a.remove(0), None);
assert_eq!(a.remove(10), None);
}
#[test]
fn test_capacity() {
let mut v = vec![0u64];
v.reserve_exact(10u);
assert_eq!(v.capacity(), 10u);
let mut v = vec![0u32];
v.reserve_exact(10u);
assert_eq!(v.capacity(), 10u);
}
#[test]
fn test_slice_2() {
let v = vec![1i, 2, 3, 4, 5];
let v = v.slice(1u, 3u);
assert_eq!(v.len(), 2u);
assert_eq!(v[0], 2);
assert_eq!(v[1], 3);
}
#[test]
#[should_fail]
fn test_from_fn_fail() {
Vec::from_fn(100, |v| {
if v == 50 { fail!() }
box 0i
});
}
#[test]
#[should_fail]
fn test_from_elem_fail() {
struct S {
f: Cell<int>,
boxes: (Box<int>, Rc<int>)
}
impl Clone for S {
fn clone(&self) -> S {
self.f.set(self.f.get() + 1);
if self.f.get() == 10 { fail!() }
S { f: self.f, boxes: self.boxes.clone() }
}
}
let s = S { f: Cell::new(0), boxes: (box 0, Rc::new(0)) };
let _ = Vec::from_elem(100, s);
}
#[test]
#[should_fail]
fn test_grow_fn_fail() {
let mut v = vec![];
v.grow_fn(100, |i| {
if i == 50 {
fail!()
}
(box 0i, Rc::new(0i))
})
}
#[test]
#[should_fail]
fn test_permute_fail() {
let v = [(box 0i, Rc::new(0i)), (box 0i, Rc::new(0i)),
(box 0i, Rc::new(0i)), (box 0i, Rc::new(0i))];
let mut i = 0u;
for _ in v.permutations() {
if i == 2 {
fail!()
}
i += 1;
}
}
#[test]
#[should_fail]
#[allow(deprecated)]
fn test_copy_memory_oob() {
unsafe {
let mut a = [1i, 2, 3, 4];
let b = [1i, 2, 3, 4, 5];
a.copy_memory(b);
}
}
#[test]
fn test_total_ord() {
let c: &[int] = &[1, 2, 3];
[1, 2, 3, 4].cmp(& c) == Greater;
let c: &[int] = &[1, 2, 3, 4];
[1, 2, 3].cmp(& c) == Less;
let c: &[int] = &[1, 2, 3, 6];
[1, 2, 3, 4].cmp(& c) == Equal;
let c: &[int] = &[1, 2, 3, 4, 5, 6];
[1, 2, 3, 4, 5, 5, 5, 5].cmp(& c) == Less;
let c: &[int] = &[1, 2, 3, 4];
[2, 2].cmp(& c) == Greater;
}
#[test]
fn test_iterator() {
let xs = [1i, 2, 5, 10, 11];
let mut it = xs.iter();
assert_eq!(it.size_hint(), (5, Some(5)));
assert_eq!(it.next().unwrap(), &1);
assert_eq!(it.size_hint(), (4, Some(4)));
assert_eq!(it.next().unwrap(), &2);
assert_eq!(it.size_hint(), (3, Some(3)));
assert_eq!(it.next().unwrap(), &5);
assert_eq!(it.size_hint(), (2, Some(2)));
assert_eq!(it.next().unwrap(), &10);
assert_eq!(it.size_hint(), (1, Some(1)));
assert_eq!(it.next().unwrap(), &11);
assert_eq!(it.size_hint(), (0, Some(0)));
assert!(it.next().is_none());
}
#[test]
fn test_random_access_iterator() {
let xs = [1i, 2, 5, 10, 11];
let mut it = xs.iter();
assert_eq!(it.indexable(), 5);
assert_eq!(it.idx(0).unwrap(), &1);
assert_eq!(it.idx(2).unwrap(), &5);
assert_eq!(it.idx(4).unwrap(), &11);
assert!(it.idx(5).is_none());
assert_eq!(it.next().unwrap(), &1);
assert_eq!(it.indexable(), 4);
assert_eq!(it.idx(0).unwrap(), &2);
assert_eq!(it.idx(3).unwrap(), &11);
assert!(it.idx(4).is_none());
assert_eq!(it.next().unwrap(), &2);
assert_eq!(it.indexable(), 3);
assert_eq!(it.idx(1).unwrap(), &10);
assert!(it.idx(3).is_none());
assert_eq!(it.next().unwrap(), &5);
assert_eq!(it.indexable(), 2);
assert_eq!(it.idx(1).unwrap(), &11);
assert_eq!(it.next().unwrap(), &10);
assert_eq!(it.indexable(), 1);
assert_eq!(it.idx(0).unwrap(), &11);
assert!(it.idx(1).is_none());
assert_eq!(it.next().unwrap(), &11);
assert_eq!(it.indexable(), 0);
assert!(it.idx(0).is_none());
assert!(it.next().is_none());
}
#[test]
fn test_iter_size_hints() {
let mut xs = [1i, 2, 5, 10, 11];
assert_eq!(xs.iter().size_hint(), (5, Some(5)));
assert_eq!(xs.iter_mut().size_hint(), (5, Some(5)));
}
#[test]
fn test_iter_clone() {
let xs = [1i, 2, 5];
let mut it = xs.iter();
it.next();
let mut jt = it.clone();
assert_eq!(it.next(), jt.next());
assert_eq!(it.next(), jt.next());
assert_eq!(it.next(), jt.next());
}
#[test]
fn test_mut_iterator() {
let mut xs = [1i, 2, 3, 4, 5];
for x in xs.iter_mut() {
*x += 1;
}
assert!(xs == [2, 3, 4, 5, 6])
}
#[test]
fn test_rev_iterator() {
let xs = [1i, 2, 5, 10, 11];
let ys = [11, 10, 5, 2, 1];
let mut i = 0;
for &x in xs.iter().rev() {
assert_eq!(x, ys[i]);
i += 1;
}
assert_eq!(i, 5);
}
#[test]
fn test_mut_rev_iterator() {
let mut xs = [1u, 2, 3, 4, 5];
for (i,x) in xs.iter_mut().rev().enumerate() {
*x += i;
}
assert!(xs == [5, 5, 5, 5, 5])
}
#[test]
fn test_move_iterator() {
let xs = vec![1u,2,3,4,5];
assert_eq!(xs.into_iter().fold(0, |a: uint, b: uint| 10*a + b), 12345);
}
#[test]
fn test_move_rev_iterator() {
let xs = vec![1u,2,3,4,5];
assert_eq!(xs.into_iter().rev().fold(0, |a: uint, b: uint| 10*a + b), 54321);
}
#[test]
fn test_splitator() {
let xs = &[1i,2,3,4,5];
let splits: &[&[int]] = &[&[1], &[3], &[5]];
assert_eq!(xs.split(|x| *x % 2 == 0).collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[], &[2,3,4,5]];
assert_eq!(xs.split(|x| *x == 1).collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[1,2,3,4], &[]];
assert_eq!(xs.split(|x| *x == 5).collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[1,2,3,4,5]];
assert_eq!(xs.split(|x| *x == 10).collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[], &[], &[], &[], &[], &[]];
assert_eq!(xs.split(|_| true).collect::<Vec<&[int]>>().as_slice(),
splits);
let xs: &[int] = &[];
let splits: &[&[int]] = &[&[]];
assert_eq!(xs.split(|x| *x == 5).collect::<Vec<&[int]>>().as_slice(), splits);
}
#[test]
fn test_splitnator() {
let xs = &[1i,2,3,4,5];
let splits: &[&[int]] = &[&[1,2,3,4,5]];
assert_eq!(xs.splitn(0, |x| *x % 2 == 0).collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[1], &[3,4,5]];
assert_eq!(xs.splitn(1, |x| *x % 2 == 0).collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[], &[], &[], &[4,5]];
assert_eq!(xs.splitn(3, |_| true).collect::<Vec<&[int]>>().as_slice(),
splits);
let xs: &[int] = &[];
let splits: &[&[int]] = &[&[]];
assert_eq!(xs.splitn(1, |x| *x == 5).collect::<Vec<&[int]>>().as_slice(), splits);
}
#[test]
fn test_splitnator_mut() {
let xs = &mut [1i,2,3,4,5];
let splits: &[&mut [int]] = &[&mut [1,2,3,4,5]];
assert_eq!(xs.splitn_mut(0, |x| *x % 2 == 0).collect::<Vec<&mut [int]>>().as_slice(),
splits);
let splits: &[&mut [int]] = &[&mut [1], &mut [3,4,5]];
assert_eq!(xs.splitn_mut(1, |x| *x % 2 == 0).collect::<Vec<&mut [int]>>().as_slice(),
splits);
let splits: &[&mut [int]] = &[&mut [], &mut [], &mut [], &mut [4,5]];
assert_eq!(xs.splitn_mut(3, |_| true).collect::<Vec<&mut [int]>>().as_slice(),
splits);
let xs: &mut [int] = &mut [];
let splits: &[&mut [int]] = &[&mut []];
assert_eq!(xs.splitn_mut(1, |x| *x == 5).collect::<Vec<&mut [int]>>().as_slice(),
splits);
}
#[test]
fn test_rsplitator() {
let xs = &[1i,2,3,4,5];
let splits: &[&[int]] = &[&[5], &[3], &[1]];
assert_eq!(xs.split(|x| *x % 2 == 0).rev().collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[2,3,4,5], &[]];
assert_eq!(xs.split(|x| *x == 1).rev().collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[], &[1,2,3,4]];
assert_eq!(xs.split(|x| *x == 5).rev().collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[1,2,3,4,5]];
assert_eq!(xs.split(|x| *x == 10).rev().collect::<Vec<&[int]>>().as_slice(),
splits);
let xs: &[int] = &[];
let splits: &[&[int]] = &[&[]];
assert_eq!(xs.split(|x| *x == 5).rev().collect::<Vec<&[int]>>().as_slice(), splits);
}
#[test]
fn test_rsplitnator() {
let xs = &[1,2,3,4,5];
let splits: &[&[int]] = &[&[1,2,3,4,5]];
assert_eq!(xs.rsplitn(0, |x| *x % 2 == 0).collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[5], &[1,2,3]];
assert_eq!(xs.rsplitn(1, |x| *x % 2 == 0).collect::<Vec<&[int]>>().as_slice(),
splits);
let splits: &[&[int]] = &[&[], &[], &[], &[1,2]];
assert_eq!(xs.rsplitn(3, |_| true).collect::<Vec<&[int]>>().as_slice(),
splits);
let xs: &[int] = &[];
let splits: &[&[int]] = &[&[]];
assert_eq!(xs.rsplitn(1, |x| *x == 5).collect::<Vec<&[int]>>().as_slice(), splits);
}
#[test]
fn test_windowsator() {
let v = &[1i,2,3,4];
let wins: &[&[int]] = &[&[1,2], &[2,3], &[3,4]];
assert_eq!(v.windows(2).collect::<Vec<&[int]>>().as_slice(), wins);
let wins: &[&[int]] = &[&[1i,2,3], &[2,3,4]];
assert_eq!(v.windows(3).collect::<Vec<&[int]>>().as_slice(), wins);
assert!(v.windows(6).next().is_none());
}
#[test]
#[should_fail]
fn test_windowsator_0() {
let v = &[1i,2,3,4];
let _it = v.windows(0);
}
#[test]
fn test_chunksator() {
let v = &[1i,2,3,4,5];
let chunks: &[&[int]] = &[&[1i,2], &[3,4], &[5]];
assert_eq!(v.chunks(2).collect::<Vec<&[int]>>().as_slice(), chunks);
let chunks: &[&[int]] = &[&[1i,2,3], &[4,5]];
assert_eq!(v.chunks(3).collect::<Vec<&[int]>>().as_slice(), chunks);
let chunks: &[&[int]] = &[&[1i,2,3,4,5]];
assert_eq!(v.chunks(6).collect::<Vec<&[int]>>().as_slice(), chunks);
let chunks: &[&[int]] = &[&[5i], &[3,4], &[1,2]];
assert_eq!(v.chunks(2).rev().collect::<Vec<&[int]>>().as_slice(), chunks);
let mut it = v.chunks(2);
assert_eq!(it.indexable(), 3);
let chunk: &[int] = &[1,2];
assert_eq!(it.idx(0).unwrap(), chunk);
let chunk: &[int] = &[3,4];
assert_eq!(it.idx(1).unwrap(), chunk);
let chunk: &[int] = &[5];
assert_eq!(it.idx(2).unwrap(), chunk);
assert_eq!(it.idx(3), None);
}
#[test]
#[should_fail]
fn test_chunksator_0() {
let v = &[1i,2,3,4];
let _it = v.chunks(0);
}
#[test]
fn test_move_from() {
let mut a = [1i,2,3,4,5];
let b = vec![6i,7,8];
assert_eq!(a.move_from(b, 0, 3), 3);
assert!(a == [6i,7,8,4,5]);
let mut a = [7i,2,8,1];
let b = vec![3i,1,4,1,5,9];
assert_eq!(a.move_from(b, 0, 6), 4);
assert!(a == [3i,1,4,1]);
let mut a = [1i,2,3,4];
let b = vec![5i,6,7,8,9,0];
assert_eq!(a.move_from(b, 2, 3), 1);
assert!(a == [7i,2,3,4]);
let mut a = [1i,2,3,4,5];
let b = vec![5i,6,7,8,9,0];
assert_eq!(a.slice_mut(2,4).move_from(b,1,6), 2);
assert!(a == [1i,2,6,7,5]);
}
#[test]
#[allow(deprecated)]
fn test_copy_from() {
let mut a = [1i,2,3,4,5];
let b = [6i,7,8];
assert_eq!(a.copy_from(b), 3);
assert!(a == [6i,7,8,4,5]);
let mut c = [7i,2,8,1];
let d = [3i,1,4,1,5,9];
assert_eq!(c.copy_from(d), 4);
assert!(c == [3i,1,4,1]);
}
#[test]
fn test_reverse_part() {
let mut values = [1i,2,3,4,5];
values.slice_mut(1, 4).reverse();
assert!(values == [1,4,3,2,5]);
}
#[test]
fn test_show() {
macro_rules! test_show_vec(
($x:expr, $x_str:expr) => ({
let (x, x_str) = ($x, $x_str);
assert_eq!(format!("{}", x), x_str);
assert_eq!(format!("{}", x.as_slice()), x_str);
})
)
let empty: Vec<int> = vec![];
test_show_vec!(empty, "[]".to_string());
test_show_vec!(vec![1i], "[1]".to_string());
test_show_vec!(vec![1i, 2, 3], "[1, 2, 3]".to_string());
test_show_vec!(vec![vec![], vec![1u], vec![1u, 1u]],
"[[], [1], [1, 1]]".to_string());
let empty_mut: &mut [int] = &mut[];
test_show_vec!(empty_mut, "[]".to_string());
let v: &mut[int] = &mut[1];
test_show_vec!(v, "[1]".to_string());
let v: &mut[int] = &mut[1, 2, 3];
test_show_vec!(v, "[1, 2, 3]".to_string());
let v: &mut [&mut[uint]] = &mut[&mut[], &mut[1u], &mut[1u, 1u]];
test_show_vec!(v, "[[], [1], [1, 1]]".to_string());
}
#[test]
fn test_vec_default() {
macro_rules! t (
($ty:ty) => {{
let v: $ty = Default::default();
assert!(v.is_empty());
}}
);
t!(&[int]);
t!(Vec<int>);
}
#[test]
fn test_bytes_set_memory() {
use slice::bytes::MutableByteVector;
let mut values = [1u8,2,3,4,5];
values.slice_mut(0,5).set_memory(0xAB);
assert!(values == [0xAB, 0xAB, 0xAB, 0xAB, 0xAB]);
values.slice_mut(2,4).set_memory(0xFF);
assert!(values == [0xAB, 0xAB, 0xFF, 0xFF, 0xAB]);
}
#[test]
#[should_fail]
fn test_overflow_does_not_cause_segfault() {
let mut v = vec![];
v.reserve_exact(-1);
v.push(1i);
v.push(2);
}
#[test]
#[should_fail]
fn test_overflow_does_not_cause_segfault_managed() {
let mut v = vec![Rc::new(1i)];
v.reserve_exact(-1);
v.push(Rc::new(2i));
}
#[test]
fn test_mut_split_at() {
let mut values = [1u8,2,3,4,5];
{
let (left, right) = values.split_at_mut(2);
assert!(left.slice(0, left.len()) == [1, 2]);
for p in left.iter_mut() {
*p += 1;
}
assert!(right.slice(0, right.len()) == [3, 4, 5]);
for p in right.iter_mut() {
*p += 2;
}
}
assert!(values == [2, 3, 5, 6, 7]);
}
#[deriving(Clone, PartialEq)]
struct Foo;
#[test]
fn test_iter_zero_sized() {
let mut v = vec![Foo, Foo, Foo];
assert_eq!(v.len(), 3);
let mut cnt = 0u;
for f in v.iter() {
assert!(*f == Foo);
cnt += 1;
}
assert_eq!(cnt, 3);
for f in v.slice(1, 3).iter() {
assert!(*f == Foo);
cnt += 1;
}
assert_eq!(cnt, 5);
for f in v.iter_mut() {
assert!(*f == Foo);
cnt += 1;
}
assert_eq!(cnt, 8);
for f in v.into_iter() {
assert!(f == Foo);
cnt += 1;
}
assert_eq!(cnt, 11);
let xs: [Foo, ..3] = [Foo, Foo, Foo];
cnt = 0;
for f in xs.iter() {
assert!(*f == Foo);
cnt += 1;
}
assert!(cnt == 3);
}
#[test]
fn test_shrink_to_fit() {
let mut xs = vec![0, 1, 2, 3];
for i in range(4i, 100) {
xs.push(i)
}
assert_eq!(xs.capacity(), 128);
xs.shrink_to_fit();
assert_eq!(xs.capacity(), 100);
assert_eq!(xs, range(0i, 100i).collect::<Vec<_>>());
}
#[test]
fn test_starts_with() {
assert!(b"foobar".starts_with(b"foo"));
assert!(!b"foobar".starts_with(b"oob"));
assert!(!b"foobar".starts_with(b"bar"));
assert!(!b"foo".starts_with(b"foobar"));
assert!(!b"bar".starts_with(b"foobar"));
assert!(b"foobar".starts_with(b"foobar"));
let empty: &[u8] = [];
assert!(empty.starts_with(empty));
assert!(!empty.starts_with(b"foo"));
assert!(b"foobar".starts_with(empty));
}
#[test]
fn test_ends_with() {
assert!(b"foobar".ends_with(b"bar"));
assert!(!b"foobar".ends_with(b"oba"));
assert!(!b"foobar".ends_with(b"foo"));
assert!(!b"foo".ends_with(b"foobar"));
assert!(!b"bar".ends_with(b"foobar"));
assert!(b"foobar".ends_with(b"foobar"));
let empty: &[u8] = [];
assert!(empty.ends_with(empty));
assert!(!empty.ends_with(b"foo"));
assert!(b"foobar".ends_with(empty));
}
#[test]
#[allow(deprecated)]
fn test_shift_ref() {
let mut x: &[int] = [1, 2, 3, 4, 5];
let h = x.shift_ref();
assert_eq!(*h.unwrap(), 1);
assert_eq!(x.len(), 4);
assert_eq!(x[0], 2);
assert_eq!(x[3], 5);
let mut y: &[int] = [];
assert_eq!(y.shift_ref(), None);
}
#[test]
#[allow(deprecated)]
fn test_pop_ref() {
let mut x: &[int] = [1, 2, 3, 4, 5];
let h = x.pop_ref();
assert_eq!(*h.unwrap(), 5);
assert_eq!(x.len(), 4);
assert_eq!(x[0], 1);
assert_eq!(x[3], 4);
let mut y: &[int] = [];
assert!(y.pop_ref().is_none());
}
#[test]
fn test_mut_splitator() {
let mut xs = [0i,1,0,2,3,0,0,4,5,0];
assert_eq!(xs.split_mut(|x| *x == 0).count(), 6);
for slice in xs.split_mut(|x| *x == 0) {
slice.reverse();
}
assert!(xs == [0,1,0,3,2,0,0,5,4,0]);
let mut xs = [0i,1,0,2,3,0,0,4,5,0,6,7];
for slice in xs.split_mut(|x| *x == 0).take(5) {
slice.reverse();
}
assert!(xs == [0,1,0,3,2,0,0,5,4,0,6,7]);
}
#[test]
fn test_mut_splitator_rev() {
let mut xs = [1i,2,0,3,4,0,0,5,6,0];
for slice in xs.split_mut(|x| *x == 0).rev().take(4) {
slice.reverse();
}
assert!(xs == [1,2,0,4,3,0,0,6,5,0]);
}
#[test]
fn test_get_mut() {
let mut v = [0i,1,2];
assert_eq!(v.get_mut(3), None);
v.get_mut(1).map(|e| *e = 7);
assert_eq!(v[1], 7);
let mut x = 2;
assert_eq!(v.get_mut(2), Some(&mut x));
}
#[test]
fn test_mut_chunks() {
let mut v = [0u8, 1, 2, 3, 4, 5, 6];
for (i, chunk) in v.chunks_mut(3).enumerate() {
for x in chunk.iter_mut() {
*x = i as u8;
}
}
let result = [0u8, 0, 0, 1, 1, 1, 2];
assert!(v == result);
}
#[test]
fn test_mut_chunks_rev() {
let mut v = [0u8, 1, 2, 3, 4, 5, 6];
for (i, chunk) in v.chunks_mut(3).rev().enumerate() {
for x in chunk.iter_mut() {
*x = i as u8;
}
}
let result = [2u8, 2, 2, 1, 1, 1, 0];
assert!(v == result);
}
#[test]
#[should_fail]
fn test_mut_chunks_0() {
let mut v = [1i, 2, 3, 4];
let _it = v.chunks_mut(0);
}
#[test]
#[allow(deprecated)]
fn test_mut_shift_ref() {
let mut x: &mut [int] = [1, 2, 3, 4, 5];
let h = x.mut_shift_ref();
assert_eq!(*h.unwrap(), 1);
assert_eq!(x.len(), 4);
assert_eq!(x[0], 2);
assert_eq!(x[3], 5);
let mut y: &mut [int] = [];
assert!(y.mut_shift_ref().is_none());
}
#[test]
#[allow(deprecated)]
fn test_mut_pop_ref() {
let mut x: &mut [int] = [1, 2, 3, 4, 5];
let h = x.mut_pop_ref();
assert_eq!(*h.unwrap(), 5);
assert_eq!(x.len(), 4);
assert_eq!(x[0], 1);
assert_eq!(x[3], 4);
let mut y: &mut [int] = [];
assert!(y.mut_pop_ref().is_none());
}
#[test]
fn test_mut_last() {
let mut x = [1i, 2, 3, 4, 5];
let h = x.last_mut();
assert_eq!(*h.unwrap(), 5);
let y: &mut [int] = [];
assert!(y.last_mut().is_none());
}
}
#[cfg(test)]
mod bench {
use std::prelude::*;
use std::rand::{weak_rng, Rng};
use std::mem;
use std::ptr;
use test::Bencher;
use vec::Vec;
use MutableSeq;
#[bench]
fn iterator(b: &mut Bencher) {
// peculiar numbers to stop LLVM from optimising the summation
// out.
let v = Vec::from_fn(100, |i| i ^ (i << 1) ^ (i >> 1));
b.iter(|| {
let mut sum = 0;
for x in v.iter() {
sum += *x;
}
// sum == 11806, to stop dead code elimination.
if sum == 0 {fail!()}
})
}
#[bench]
fn mut_iterator(b: &mut Bencher) {
let mut v = Vec::from_elem(100, 0i);
b.iter(|| {
let mut i = 0i;
for x in v.iter_mut() {
*x = i;
i += 1;
}
})
}
#[bench]
fn concat(b: &mut Bencher) {
let xss: Vec<Vec<uint>> =
Vec::from_fn(100, |i| range(0u, i).collect());
b.iter(|| {
xss.as_slice().concat_vec()
});
}
#[bench]
fn connect(b: &mut Bencher) {
let xss: Vec<Vec<uint>> =
Vec::from_fn(100, |i| range(0u, i).collect());
b.iter(|| {
xss.as_slice().connect_vec(&0)
});
}
#[bench]
fn push(b: &mut Bencher) {
let mut vec: Vec<uint> = vec![];
b.iter(|| {
vec.push(0);
&vec
})
}
#[bench]
fn starts_with_same_vector(b: &mut Bencher) {
let vec: Vec<uint> = Vec::from_fn(100, |i| i);
b.iter(|| {
vec.as_slice().starts_with(vec.as_slice())
})
}
#[bench]
fn starts_with_single_element(b: &mut Bencher) {
let vec: Vec<uint> = vec![0];
b.iter(|| {
vec.as_slice().starts_with(vec.as_slice())
})
}
#[bench]
fn starts_with_diff_one_element_at_end(b: &mut Bencher) {
let vec: Vec<uint> = Vec::from_fn(100, |i| i);
let mut match_vec: Vec<uint> = Vec::from_fn(99, |i| i);
match_vec.push(0);
b.iter(|| {
vec.as_slice().starts_with(match_vec.as_slice())
})
}
#[bench]
fn ends_with_same_vector(b: &mut Bencher) {
let vec: Vec<uint> = Vec::from_fn(100, |i| i);
b.iter(|| {
vec.as_slice().ends_with(vec.as_slice())
})
}
#[bench]
fn ends_with_single_element(b: &mut Bencher) {
let vec: Vec<uint> = vec![0];
b.iter(|| {
vec.as_slice().ends_with(vec.as_slice())
})
}
#[bench]
fn ends_with_diff_one_element_at_beginning(b: &mut Bencher) {
let vec: Vec<uint> = Vec::from_fn(100, |i| i);
let mut match_vec: Vec<uint> = Vec::from_fn(100, |i| i);
match_vec.as_mut_slice()[0] = 200;
b.iter(|| {
vec.as_slice().starts_with(match_vec.as_slice())
})
}
#[bench]
fn contains_last_element(b: &mut Bencher) {
let vec: Vec<uint> = Vec::from_fn(100, |i| i);
b.iter(|| {
vec.contains(&99u)
})
}
#[bench]
fn zero_1kb_from_elem(b: &mut Bencher) {
b.iter(|| {
Vec::from_elem(1024, 0u8)
});
}
#[bench]
fn zero_1kb_set_memory(b: &mut Bencher) {
b.iter(|| {
let mut v: Vec<uint> = Vec::with_capacity(1024);
unsafe {
let vp = v.as_mut_ptr();
ptr::set_memory(vp, 0, 1024);
v.set_len(1024);
}
v
});
}
#[bench]
fn zero_1kb_loop_set(b: &mut Bencher) {
b.iter(|| {
let mut v: Vec<uint> = Vec::with_capacity(1024);
unsafe {
v.set_len(1024);
}
for i in range(0u, 1024) {
*v.get_mut(i) = 0;
}
});
}
#[bench]
fn zero_1kb_mut_iter(b: &mut Bencher) {
b.iter(|| {
let mut v = Vec::with_capacity(1024);
unsafe {
v.set_len(1024);
}
for x in v.iter_mut() {
*x = 0i;
}
v
});
}
#[bench]
fn random_inserts(b: &mut Bencher) {
let mut rng = weak_rng();
b.iter(|| {
let mut v = Vec::from_elem(30, (0u, 0u));
for _ in range(0u, 100) {
let l = v.len();
v.insert(rng.gen::<uint>() % (l + 1),
(1, 1));
}
})
}
#[bench]
fn random_removes(b: &mut Bencher) {
let mut rng = weak_rng();
b.iter(|| {
let mut v = Vec::from_elem(130, (0u, 0u));
for _ in range(0u, 100) {
let l = v.len();
v.remove(rng.gen::<uint>() % l);
}
})
}
#[bench]
fn sort_random_small(b: &mut Bencher) {
let mut rng = weak_rng();
b.iter(|| {
let mut v = rng.gen_iter::<u64>().take(5).collect::<Vec<u64>>();
v.as_mut_slice().sort();
});
b.bytes = 5 * mem::size_of::<u64>() as u64;
}
#[bench]
fn sort_random_medium(b: &mut Bencher) {
let mut rng = weak_rng();
b.iter(|| {
let mut v = rng.gen_iter::<u64>().take(100).collect::<Vec<u64>>();
v.as_mut_slice().sort();
});
b.bytes = 100 * mem::size_of::<u64>() as u64;
}
#[bench]
fn sort_random_large(b: &mut Bencher) {
let mut rng = weak_rng();
b.iter(|| {
let mut v = rng.gen_iter::<u64>().take(10000).collect::<Vec<u64>>();
v.as_mut_slice().sort();
});
b.bytes = 10000 * mem::size_of::<u64>() as u64;
}
#[bench]
fn sort_sorted(b: &mut Bencher) {
let mut v = Vec::from_fn(10000, |i| i);
b.iter(|| {
v.sort();
});
b.bytes = (v.len() * mem::size_of_val(&v[0])) as u64;
}
type BigSortable = (u64,u64,u64,u64);
#[bench]
fn sort_big_random_small(b: &mut Bencher) {
let mut rng = weak_rng();
b.iter(|| {
let mut v = rng.gen_iter::<BigSortable>().take(5)
.collect::<Vec<BigSortable>>();
v.sort();
});
b.bytes = 5 * mem::size_of::<BigSortable>() as u64;
}
#[bench]
fn sort_big_random_medium(b: &mut Bencher) {
let mut rng = weak_rng();
b.iter(|| {
let mut v = rng.gen_iter::<BigSortable>().take(100)
.collect::<Vec<BigSortable>>();
v.sort();
});
b.bytes = 100 * mem::size_of::<BigSortable>() as u64;
}
#[bench]
fn sort_big_random_large(b: &mut Bencher) {
let mut rng = weak_rng();
b.iter(|| {
let mut v = rng.gen_iter::<BigSortable>().take(10000)
.collect::<Vec<BigSortable>>();
v.sort();
});
b.bytes = 10000 * mem::size_of::<BigSortable>() as u64;
}
#[bench]
fn sort_big_sorted(b: &mut Bencher) {
let mut v = Vec::from_fn(10000u, |i| (i, i, i, i));
b.iter(|| {
v.sort();
});
b.bytes = (v.len() * mem::size_of_val(&v[0])) as u64;
}
}
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