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<main>
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<h1 id="final-code"><a class="header" href="#final-code">Final Code</a></h1>
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<p>我真不敢相信，我居然让你坐在那里，听我从头开始重新实现 std::collections::LinkedList，一路上我犯了很多繁琐的小错误。</p>
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<p>我做到了，书写完了，我终于可以休息了。</p>
|
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<p>好了，下面是我们完整重写的 1200 行代码的全部内容。这应该与 <a href="https://github.com/contain-rs/linked-list/commit/5b69cc29454595172a5167a09277660342b78092">this commit</a> 的文本相同。</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
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</span><span class="boring">fn main() {
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</span>use std::cmp::Ordering;
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use std::fmt::{self, Debug};
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use std::hash::{Hash, Hasher};
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use std::iter::FromIterator;
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use std::marker::PhantomData;
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use std::ptr::NonNull;
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pub struct LinkedList<T> {
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|
front: Link<T>,
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back: Link<T>,
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len: usize,
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|
_boo: PhantomData<T>,
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}
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type Link<T> = Option<NonNull<Node<T>>>;
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struct Node<T> {
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front: Link<T>,
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back: Link<T>,
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elem: T,
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}
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|
pub struct Iter<'a, T> {
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|
front: Link<T>,
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|
back: Link<T>,
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|
|
len: usize,
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|
|
_boo: PhantomData<&'a T>,
|
|
|
}
|
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|
|
pub struct IterMut<'a, T> {
|
|
|
front: Link<T>,
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|
|
back: Link<T>,
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|
|
len: usize,
|
|
|
_boo: PhantomData<&'a mut T>,
|
|
|
}
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|
|
pub struct IntoIter<T> {
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|
list: LinkedList<T>,
|
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|
}
|
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|
|
pub struct CursorMut<'a, T> {
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|
list: &'a mut LinkedList<T>,
|
|
|
cur: Link<T>,
|
|
|
index: Option<usize>,
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|
}
|
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|
impl<T> LinkedList<T> {
|
|
|
pub fn new() -> Self {
|
|
|
Self {
|
|
|
front: None,
|
|
|
back: None,
|
|
|
len: 0,
|
|
|
_boo: PhantomData,
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn push_front(&mut self, elem: T) {
|
|
|
// SAFETY: it's a linked-list, what do you want?
|
|
|
unsafe {
|
|
|
let new = NonNull::new_unchecked(Box::into_raw(Box::new(Node {
|
|
|
front: None,
|
|
|
back: None,
|
|
|
elem,
|
|
|
})));
|
|
|
if let Some(old) = self.front {
|
|
|
// Put the new front before the old one
|
|
|
(*old.as_ptr()).front = Some(new);
|
|
|
(*new.as_ptr()).back = Some(old);
|
|
|
} else {
|
|
|
// If there's no front, then we're the empty list and need
|
|
|
// to set the back too.
|
|
|
self.back = Some(new);
|
|
|
}
|
|
|
// These things always happen!
|
|
|
self.front = Some(new);
|
|
|
self.len += 1;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn push_back(&mut self, elem: T) {
|
|
|
// SAFETY: it's a linked-list, what do you want?
|
|
|
unsafe {
|
|
|
let new = NonNull::new_unchecked(Box::into_raw(Box::new(Node {
|
|
|
back: None,
|
|
|
front: None,
|
|
|
elem,
|
|
|
})));
|
|
|
if let Some(old) = self.back {
|
|
|
// Put the new back before the old one
|
|
|
(*old.as_ptr()).back = Some(new);
|
|
|
(*new.as_ptr()).front = Some(old);
|
|
|
} else {
|
|
|
// If there's no back, then we're the empty list and need
|
|
|
// to set the front too.
|
|
|
self.front = Some(new);
|
|
|
}
|
|
|
// These things always happen!
|
|
|
self.back = Some(new);
|
|
|
self.len += 1;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn pop_front(&mut self) -> Option<T> {
|
|
|
unsafe {
|
|
|
// Only have to do stuff if there is a front node to pop.
|
|
|
self.front.map(|node| {
|
|
|
// Bring the Box back to life so we can move out its value and
|
|
|
// Drop it (Box continues to magically understand this for us).
|
|
|
let boxed_node = Box::from_raw(node.as_ptr());
|
|
|
let result = boxed_node.elem;
|
|
|
|
|
|
// Make the next node into the new front.
|
|
|
self.front = boxed_node.back;
|
|
|
if let Some(new) = self.front {
|
|
|
// Cleanup its reference to the removed node
|
|
|
(*new.as_ptr()).front = None;
|
|
|
} else {
|
|
|
// If the front is now null, then this list is now empty!
|
|
|
self.back = None;
|
|
|
}
|
|
|
|
|
|
self.len -= 1;
|
|
|
result
|
|
|
// Box gets implicitly freed here, knows there is no T.
|
|
|
})
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn pop_back(&mut self) -> Option<T> {
|
|
|
unsafe {
|
|
|
// Only have to do stuff if there is a back node to pop.
|
|
|
self.back.map(|node| {
|
|
|
// Bring the Box front to life so we can move out its value and
|
|
|
// Drop it (Box continues to magically understand this for us).
|
|
|
let boxed_node = Box::from_raw(node.as_ptr());
|
|
|
let result = boxed_node.elem;
|
|
|
|
|
|
// Make the next node into the new back.
|
|
|
self.back = boxed_node.front;
|
|
|
if let Some(new) = self.back {
|
|
|
// Cleanup its reference to the removed node
|
|
|
(*new.as_ptr()).back = None;
|
|
|
} else {
|
|
|
// If the back is now null, then this list is now empty!
|
|
|
self.front = None;
|
|
|
}
|
|
|
|
|
|
self.len -= 1;
|
|
|
result
|
|
|
// Box gets implicitly freed here, knows there is no T.
|
|
|
})
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn front(&self) -> Option<&T> {
|
|
|
unsafe { self.front.map(|node| &(*node.as_ptr()).elem) }
|
|
|
}
|
|
|
|
|
|
pub fn front_mut(&mut self) -> Option<&mut T> {
|
|
|
unsafe { self.front.map(|node| &mut (*node.as_ptr()).elem) }
|
|
|
}
|
|
|
|
|
|
pub fn back(&self) -> Option<&T> {
|
|
|
unsafe { self.back.map(|node| &(*node.as_ptr()).elem) }
|
|
|
}
|
|
|
|
|
|
pub fn back_mut(&mut self) -> Option<&mut T> {
|
|
|
unsafe { self.back.map(|node| &mut (*node.as_ptr()).elem) }
|
|
|
}
|
|
|
|
|
|
pub fn len(&self) -> usize {
|
|
|
self.len
|
|
|
}
|
|
|
|
|
|
pub fn is_empty(&self) -> bool {
|
|
|
self.len == 0
|
|
|
}
|
|
|
|
|
|
pub fn clear(&mut self) {
|
|
|
// Oh look it's drop again
|
|
|
while self.pop_front().is_some() {}
|
|
|
}
|
|
|
|
|
|
pub fn iter(&self) -> Iter<T> {
|
|
|
Iter {
|
|
|
front: self.front,
|
|
|
back: self.back,
|
|
|
len: self.len,
|
|
|
_boo: PhantomData,
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn iter_mut(&mut self) -> IterMut<T> {
|
|
|
IterMut {
|
|
|
front: self.front,
|
|
|
back: self.back,
|
|
|
len: self.len,
|
|
|
_boo: PhantomData,
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn cursor_mut(&mut self) -> CursorMut<T> {
|
|
|
CursorMut {
|
|
|
list: self,
|
|
|
cur: None,
|
|
|
index: None,
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T> Drop for LinkedList<T> {
|
|
|
fn drop(&mut self) {
|
|
|
// Pop until we have to stop
|
|
|
while self.pop_front().is_some() {}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T> Default for LinkedList<T> {
|
|
|
fn default() -> Self {
|
|
|
Self::new()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T: Clone> Clone for LinkedList<T> {
|
|
|
fn clone(&self) -> Self {
|
|
|
let mut new_list = Self::new();
|
|
|
for item in self {
|
|
|
new_list.push_back(item.clone());
|
|
|
}
|
|
|
new_list
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T> Extend<T> for LinkedList<T> {
|
|
|
fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I) {
|
|
|
for item in iter {
|
|
|
self.push_back(item);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T> FromIterator<T> for LinkedList<T> {
|
|
|
fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
|
|
|
let mut list = Self::new();
|
|
|
list.extend(iter);
|
|
|
list
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T: Debug> Debug for LinkedList<T> {
|
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
|
f.debug_list().entries(self).finish()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T: PartialEq> PartialEq for LinkedList<T> {
|
|
|
fn eq(&self, other: &Self) -> bool {
|
|
|
self.len() == other.len() && self.iter().eq(other)
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T: Eq> Eq for LinkedList<T> {}
|
|
|
|
|
|
impl<T: PartialOrd> PartialOrd for LinkedList<T> {
|
|
|
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
|
|
|
self.iter().partial_cmp(other)
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T: Ord> Ord for LinkedList<T> {
|
|
|
fn cmp(&self, other: &Self) -> Ordering {
|
|
|
self.iter().cmp(other)
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T: Hash> Hash for LinkedList<T> {
|
|
|
fn hash<H: Hasher>(&self, state: &mut H) {
|
|
|
self.len().hash(state);
|
|
|
for item in self {
|
|
|
item.hash(state);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> IntoIterator for &'a LinkedList<T> {
|
|
|
type IntoIter = Iter<'a, T>;
|
|
|
type Item = &'a T;
|
|
|
|
|
|
fn into_iter(self) -> Self::IntoIter {
|
|
|
self.iter()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> Iterator for Iter<'a, T> {
|
|
|
type Item = &'a T;
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
// While self.front == self.back is a tempting condition to check here,
|
|
|
// it won't do the right for yielding the last element! That sort of
|
|
|
// thing only works for arrays because of "one-past-the-end" pointers.
|
|
|
if self.len > 0 {
|
|
|
// We could unwrap front, but this is safer and easier
|
|
|
self.front.map(|node| unsafe {
|
|
|
self.len -= 1;
|
|
|
self.front = (*node.as_ptr()).back;
|
|
|
&(*node.as_ptr()).elem
|
|
|
})
|
|
|
} else {
|
|
|
None
|
|
|
}
|
|
|
}
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
(self.len, Some(self.len))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
|
|
|
fn next_back(&mut self) -> Option<Self::Item> {
|
|
|
if self.len > 0 {
|
|
|
self.back.map(|node| unsafe {
|
|
|
self.len -= 1;
|
|
|
self.back = (*node.as_ptr()).front;
|
|
|
&(*node.as_ptr()).elem
|
|
|
})
|
|
|
} else {
|
|
|
None
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> ExactSizeIterator for Iter<'a, T> {
|
|
|
fn len(&self) -> usize {
|
|
|
self.len
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> IntoIterator for &'a mut LinkedList<T> {
|
|
|
type IntoIter = IterMut<'a, T>;
|
|
|
type Item = &'a mut T;
|
|
|
|
|
|
fn into_iter(self) -> Self::IntoIter {
|
|
|
self.iter_mut()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> Iterator for IterMut<'a, T> {
|
|
|
type Item = &'a mut T;
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
// While self.front == self.back is a tempting condition to check here,
|
|
|
// it won't do the right for yielding the last element! That sort of
|
|
|
// thing only works for arrays because of "one-past-the-end" pointers.
|
|
|
if self.len > 0 {
|
|
|
// We could unwrap front, but this is safer and easier
|
|
|
self.front.map(|node| unsafe {
|
|
|
self.len -= 1;
|
|
|
self.front = (*node.as_ptr()).back;
|
|
|
&mut (*node.as_ptr()).elem
|
|
|
})
|
|
|
} else {
|
|
|
None
|
|
|
}
|
|
|
}
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
(self.len, Some(self.len))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> DoubleEndedIterator for IterMut<'a, T> {
|
|
|
fn next_back(&mut self) -> Option<Self::Item> {
|
|
|
if self.len > 0 {
|
|
|
self.back.map(|node| unsafe {
|
|
|
self.len -= 1;
|
|
|
self.back = (*node.as_ptr()).front;
|
|
|
&mut (*node.as_ptr()).elem
|
|
|
})
|
|
|
} else {
|
|
|
None
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> ExactSizeIterator for IterMut<'a, T> {
|
|
|
fn len(&self) -> usize {
|
|
|
self.len
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T> IntoIterator for LinkedList<T> {
|
|
|
type IntoIter = IntoIter<T>;
|
|
|
type Item = T;
|
|
|
|
|
|
fn into_iter(self) -> Self::IntoIter {
|
|
|
IntoIter { list: self }
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T> Iterator for IntoIter<T> {
|
|
|
type Item = T;
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
self.list.pop_front()
|
|
|
}
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
(self.list.len, Some(self.list.len))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T> DoubleEndedIterator for IntoIter<T> {
|
|
|
fn next_back(&mut self) -> Option<Self::Item> {
|
|
|
self.list.pop_back()
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<T> ExactSizeIterator for IntoIter<T> {
|
|
|
fn len(&self) -> usize {
|
|
|
self.list.len
|
|
|
}
|
|
|
}
|
|
|
|
|
|
impl<'a, T> CursorMut<'a, T> {
|
|
|
pub fn index(&self) -> Option<usize> {
|
|
|
self.index
|
|
|
}
|
|
|
|
|
|
pub fn move_next(&mut self) {
|
|
|
if let Some(cur) = self.cur {
|
|
|
unsafe {
|
|
|
// We're on a real element, go to its next (back)
|
|
|
self.cur = (*cur.as_ptr()).back;
|
|
|
if self.cur.is_some() {
|
|
|
*self.index.as_mut().unwrap() += 1;
|
|
|
} else {
|
|
|
// We just walked to the ghost, no more index
|
|
|
self.index = None;
|
|
|
}
|
|
|
}
|
|
|
} else if !self.list.is_empty() {
|
|
|
// We're at the ghost, and there is a real front, so move to it!
|
|
|
self.cur = self.list.front;
|
|
|
self.index = Some(0)
|
|
|
} else {
|
|
|
// We're at the ghost, but that's the only element... do nothing.
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn move_prev(&mut self) {
|
|
|
if let Some(cur) = self.cur {
|
|
|
unsafe {
|
|
|
// We're on a real element, go to its previous (front)
|
|
|
self.cur = (*cur.as_ptr()).front;
|
|
|
if self.cur.is_some() {
|
|
|
*self.index.as_mut().unwrap() -= 1;
|
|
|
} else {
|
|
|
// We just walked to the ghost, no more index
|
|
|
self.index = None;
|
|
|
}
|
|
|
}
|
|
|
} else if !self.list.is_empty() {
|
|
|
// We're at the ghost, and there is a real back, so move to it!
|
|
|
self.cur = self.list.back;
|
|
|
self.index = Some(self.list.len - 1)
|
|
|
} else {
|
|
|
// We're at the ghost, but that's the only element... do nothing.
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn current(&mut self) -> Option<&mut T> {
|
|
|
unsafe { self.cur.map(|node| &mut (*node.as_ptr()).elem) }
|
|
|
}
|
|
|
|
|
|
pub fn peek_next(&mut self) -> Option<&mut T> {
|
|
|
unsafe {
|
|
|
let next = if let Some(cur) = self.cur {
|
|
|
// Normal case, try to follow the cur node's back pointer
|
|
|
(*cur.as_ptr()).back
|
|
|
} else {
|
|
|
// Ghost case, try to use the list's front pointer
|
|
|
self.list.front
|
|
|
};
|
|
|
|
|
|
// Yield the element if the next node exists
|
|
|
next.map(|node| &mut (*node.as_ptr()).elem)
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn peek_prev(&mut self) -> Option<&mut T> {
|
|
|
unsafe {
|
|
|
let prev = if let Some(cur) = self.cur {
|
|
|
// Normal case, try to follow the cur node's front pointer
|
|
|
(*cur.as_ptr()).front
|
|
|
} else {
|
|
|
// Ghost case, try to use the list's back pointer
|
|
|
self.list.back
|
|
|
};
|
|
|
|
|
|
// Yield the element if the prev node exists
|
|
|
prev.map(|node| &mut (*node.as_ptr()).elem)
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn split_before(&mut self) -> LinkedList<T> {
|
|
|
// We have this:
|
|
|
//
|
|
|
// list.front -> A <-> B <-> C <-> D <- list.back
|
|
|
// ^
|
|
|
// cur
|
|
|
//
|
|
|
//
|
|
|
// And we want to produce this:
|
|
|
//
|
|
|
// list.front -> C <-> D <- list.back
|
|
|
// ^
|
|
|
// cur
|
|
|
//
|
|
|
//
|
|
|
// return.front -> A <-> B <- return.back
|
|
|
//
|
|
|
if let Some(cur) = self.cur {
|
|
|
// We are pointing at a real element, so the list is non-empty.
|
|
|
unsafe {
|
|
|
// Current state
|
|
|
let old_len = self.list.len;
|
|
|
let old_idx = self.index.unwrap();
|
|
|
let prev = (*cur.as_ptr()).front;
|
|
|
|
|
|
// What self will become
|
|
|
let new_len = old_len - old_idx;
|
|
|
let new_front = self.cur;
|
|
|
let new_back = self.list.back;
|
|
|
let new_idx = Some(0);
|
|
|
|
|
|
// What the output will become
|
|
|
let output_len = old_len - new_len;
|
|
|
let output_front = self.list.front;
|
|
|
let output_back = prev;
|
|
|
|
|
|
// Break the links between cur and prev
|
|
|
if let Some(prev) = prev {
|
|
|
(*cur.as_ptr()).front = None;
|
|
|
(*prev.as_ptr()).back = None;
|
|
|
}
|
|
|
|
|
|
// Produce the result:
|
|
|
self.list.len = new_len;
|
|
|
self.list.front = new_front;
|
|
|
self.list.back = new_back;
|
|
|
self.index = new_idx;
|
|
|
|
|
|
LinkedList {
|
|
|
front: output_front,
|
|
|
back: output_back,
|
|
|
len: output_len,
|
|
|
_boo: PhantomData,
|
|
|
}
|
|
|
}
|
|
|
} else {
|
|
|
// We're at the ghost, just replace our list with an empty one.
|
|
|
// No other state needs to be changed.
|
|
|
std::mem::replace(self.list, LinkedList::new())
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn split_after(&mut self) -> LinkedList<T> {
|
|
|
// We have this:
|
|
|
//
|
|
|
// list.front -> A <-> B <-> C <-> D <- list.back
|
|
|
// ^
|
|
|
// cur
|
|
|
//
|
|
|
//
|
|
|
// And we want to produce this:
|
|
|
//
|
|
|
// list.front -> A <-> B <- list.back
|
|
|
// ^
|
|
|
// cur
|
|
|
//
|
|
|
//
|
|
|
// return.front -> C <-> D <- return.back
|
|
|
//
|
|
|
if let Some(cur) = self.cur {
|
|
|
// We are pointing at a real element, so the list is non-empty.
|
|
|
unsafe {
|
|
|
// Current state
|
|
|
let old_len = self.list.len;
|
|
|
let old_idx = self.index.unwrap();
|
|
|
let next = (*cur.as_ptr()).back;
|
|
|
|
|
|
// What self will become
|
|
|
let new_len = old_idx + 1;
|
|
|
let new_back = self.cur;
|
|
|
let new_front = self.list.front;
|
|
|
let new_idx = Some(old_idx);
|
|
|
|
|
|
// What the output will become
|
|
|
let output_len = old_len - new_len;
|
|
|
let output_front = next;
|
|
|
let output_back = self.list.back;
|
|
|
|
|
|
// Break the links between cur and next
|
|
|
if let Some(next) = next {
|
|
|
(*cur.as_ptr()).back = None;
|
|
|
(*next.as_ptr()).front = None;
|
|
|
}
|
|
|
|
|
|
// Produce the result:
|
|
|
self.list.len = new_len;
|
|
|
self.list.front = new_front;
|
|
|
self.list.back = new_back;
|
|
|
self.index = new_idx;
|
|
|
|
|
|
LinkedList {
|
|
|
front: output_front,
|
|
|
back: output_back,
|
|
|
len: output_len,
|
|
|
_boo: PhantomData,
|
|
|
}
|
|
|
}
|
|
|
} else {
|
|
|
// We're at the ghost, just replace our list with an empty one.
|
|
|
// No other state needs to be changed.
|
|
|
std::mem::replace(self.list, LinkedList::new())
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn splice_before(&mut self, mut input: LinkedList<T>) {
|
|
|
// We have this:
|
|
|
//
|
|
|
// input.front -> 1 <-> 2 <- input.back
|
|
|
//
|
|
|
// list.front -> A <-> B <-> C <- list.back
|
|
|
// ^
|
|
|
// cur
|
|
|
//
|
|
|
//
|
|
|
// Becoming this:
|
|
|
//
|
|
|
// list.front -> A <-> 1 <-> 2 <-> B <-> C <- list.back
|
|
|
// ^
|
|
|
// cur
|
|
|
//
|
|
|
unsafe {
|
|
|
// We can either `take` the input's pointers or `mem::forget`
|
|
|
// it. Using `take` is more responsible in case we ever do custom
|
|
|
// allocators or something that also needs to be cleaned up!
|
|
|
if input.is_empty() {
|
|
|
// Input is empty, do nothing.
|
|
|
} else if let Some(cur) = self.cur {
|
|
|
// Both lists are non-empty
|
|
|
let in_front = input.front.take().unwrap();
|
|
|
let in_back = input.back.take().unwrap();
|
|
|
|
|
|
if let Some(prev) = (*cur.as_ptr()).front {
|
|
|
// General Case, no boundaries, just internal fixups
|
|
|
(*prev.as_ptr()).back = Some(in_front);
|
|
|
(*in_front.as_ptr()).front = Some(prev);
|
|
|
(*cur.as_ptr()).front = Some(in_back);
|
|
|
(*in_back.as_ptr()).back = Some(cur);
|
|
|
} else {
|
|
|
// No prev, we're appending to the front
|
|
|
(*cur.as_ptr()).front = Some(in_back);
|
|
|
(*in_back.as_ptr()).back = Some(cur);
|
|
|
self.list.front = Some(in_front);
|
|
|
}
|
|
|
// Index moves forward by input length
|
|
|
*self.index.as_mut().unwrap() += input.len;
|
|
|
} else if let Some(back) = self.list.back {
|
|
|
// We're on the ghost but non-empty, append to the back
|
|
|
let in_front = input.front.take().unwrap();
|
|
|
let in_back = input.back.take().unwrap();
|
|
|
|
|
|
(*back.as_ptr()).back = Some(in_front);
|
|
|
(*in_front.as_ptr()).front = Some(back);
|
|
|
self.list.back = Some(in_back);
|
|
|
} else {
|
|
|
// We're empty, become the input, remain on the ghost
|
|
|
std::mem::swap(self.list, &mut input);
|
|
|
}
|
|
|
|
|
|
self.list.len += input.len;
|
|
|
// Not necessary but Polite To Do
|
|
|
input.len = 0;
|
|
|
|
|
|
// Input dropped here
|
|
|
}
|
|
|
}
|
|
|
|
|
|
pub fn splice_after(&mut self, mut input: LinkedList<T>) {
|
|
|
// We have this:
|
|
|
//
|
|
|
// input.front -> 1 <-> 2 <- input.back
|
|
|
//
|
|
|
// list.front -> A <-> B <-> C <- list.back
|
|
|
// ^
|
|
|
// cur
|
|
|
//
|
|
|
//
|
|
|
// Becoming this:
|
|
|
//
|
|
|
// list.front -> A <-> B <-> 1 <-> 2 <-> C <- list.back
|
|
|
// ^
|
|
|
// cur
|
|
|
//
|
|
|
unsafe {
|
|
|
// We can either `take` the input's pointers or `mem::forget`
|
|
|
// it. Using `take` is more responsible in case we ever do custom
|
|
|
// allocators or something that also needs to be cleaned up!
|
|
|
if input.is_empty() {
|
|
|
// Input is empty, do nothing.
|
|
|
} else if let Some(cur) = self.cur {
|
|
|
// Both lists are non-empty
|
|
|
let in_front = input.front.take().unwrap();
|
|
|
let in_back = input.back.take().unwrap();
|
|
|
|
|
|
if let Some(next) = (*cur.as_ptr()).back {
|
|
|
// General Case, no boundaries, just internal fixups
|
|
|
(*next.as_ptr()).front = Some(in_back);
|
|
|
(*in_back.as_ptr()).back = Some(next);
|
|
|
(*cur.as_ptr()).back = Some(in_front);
|
|
|
(*in_front.as_ptr()).front = Some(cur);
|
|
|
} else {
|
|
|
// No next, we're appending to the back
|
|
|
(*cur.as_ptr()).back = Some(in_front);
|
|
|
(*in_front.as_ptr()).front = Some(cur);
|
|
|
self.list.back = Some(in_back);
|
|
|
}
|
|
|
// Index doesn't change
|
|
|
} else if let Some(front) = self.list.front {
|
|
|
// We're on the ghost but non-empty, append to the front
|
|
|
let in_front = input.front.take().unwrap();
|
|
|
let in_back = input.back.take().unwrap();
|
|
|
|
|
|
(*front.as_ptr()).front = Some(in_back);
|
|
|
(*in_back.as_ptr()).back = Some(front);
|
|
|
self.list.front = Some(in_front);
|
|
|
} else {
|
|
|
// We're empty, become the input, remain on the ghost
|
|
|
std::mem::swap(self.list, &mut input);
|
|
|
}
|
|
|
|
|
|
self.list.len += input.len;
|
|
|
// Not necessary but Polite To Do
|
|
|
input.len = 0;
|
|
|
|
|
|
// Input dropped here
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
unsafe impl<T: Send> Send for LinkedList<T> {}
|
|
|
unsafe impl<T: Sync> Sync for LinkedList<T> {}
|
|
|
|
|
|
unsafe impl<'a, T: Send> Send for Iter<'a, T> {}
|
|
|
unsafe impl<'a, T: Sync> Sync for Iter<'a, T> {}
|
|
|
|
|
|
unsafe impl<'a, T: Send> Send for IterMut<'a, T> {}
|
|
|
unsafe impl<'a, T: Sync> Sync for IterMut<'a, T> {}
|
|
|
|
|
|
#[allow(dead_code)]
|
|
|
fn assert_properties() {
|
|
|
fn is_send<T: Send>() {}
|
|
|
fn is_sync<T: Sync>() {}
|
|
|
|
|
|
is_send::<LinkedList<i32>>();
|
|
|
is_sync::<LinkedList<i32>>();
|
|
|
|
|
|
is_send::<IntoIter<i32>>();
|
|
|
is_sync::<IntoIter<i32>>();
|
|
|
|
|
|
is_send::<Iter<i32>>();
|
|
|
is_sync::<Iter<i32>>();
|
|
|
|
|
|
is_send::<IterMut<i32>>();
|
|
|
is_sync::<IterMut<i32>>();
|
|
|
|
|
|
fn linked_list_covariant<'a, T>(x: LinkedList<&'static T>) -> LinkedList<&'a T> {
|
|
|
x
|
|
|
}
|
|
|
fn iter_covariant<'i, 'a, T>(x: Iter<'i, &'static T>) -> Iter<'i, &'a T> {
|
|
|
x
|
|
|
}
|
|
|
fn into_iter_covariant<'a, T>(x: IntoIter<&'static T>) -> IntoIter<&'a T> {
|
|
|
x
|
|
|
}
|
|
|
|
|
|
/// ```compile_fail,E0308
|
|
|
/// use linked_list::IterMut;
|
|
|
///
|
|
|
/// fn iter_mut_covariant<'i, 'a, T>(x: IterMut<'i, &'static T>) -> IterMut<'i, &'a T> { x }
|
|
|
/// ```
|
|
|
fn iter_mut_invariant() {}
|
|
|
}
|
|
|
|
|
|
#[cfg(test)]
|
|
|
mod test {
|
|
|
use super::LinkedList;
|
|
|
|
|
|
fn generate_test() -> LinkedList<i32> {
|
|
|
list_from(&[0, 1, 2, 3, 4, 5, 6])
|
|
|
}
|
|
|
|
|
|
fn list_from<T: Clone>(v: &[T]) -> LinkedList<T> {
|
|
|
v.iter().map(|x| (*x).clone()).collect()
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_basic_front() {
|
|
|
let mut list = LinkedList::new();
|
|
|
|
|
|
// Try to break an empty list
|
|
|
assert_eq!(list.len(), 0);
|
|
|
assert_eq!(list.pop_front(), None);
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
// Try to break a one item list
|
|
|
list.push_front(10);
|
|
|
assert_eq!(list.len(), 1);
|
|
|
assert_eq!(list.pop_front(), Some(10));
|
|
|
assert_eq!(list.len(), 0);
|
|
|
assert_eq!(list.pop_front(), None);
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
// Mess around
|
|
|
list.push_front(10);
|
|
|
assert_eq!(list.len(), 1);
|
|
|
list.push_front(20);
|
|
|
assert_eq!(list.len(), 2);
|
|
|
list.push_front(30);
|
|
|
assert_eq!(list.len(), 3);
|
|
|
assert_eq!(list.pop_front(), Some(30));
|
|
|
assert_eq!(list.len(), 2);
|
|
|
list.push_front(40);
|
|
|
assert_eq!(list.len(), 3);
|
|
|
assert_eq!(list.pop_front(), Some(40));
|
|
|
assert_eq!(list.len(), 2);
|
|
|
assert_eq!(list.pop_front(), Some(20));
|
|
|
assert_eq!(list.len(), 1);
|
|
|
assert_eq!(list.pop_front(), Some(10));
|
|
|
assert_eq!(list.len(), 0);
|
|
|
assert_eq!(list.pop_front(), None);
|
|
|
assert_eq!(list.len(), 0);
|
|
|
assert_eq!(list.pop_front(), None);
|
|
|
assert_eq!(list.len(), 0);
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_basic() {
|
|
|
let mut m = LinkedList::new();
|
|
|
assert_eq!(m.pop_front(), None);
|
|
|
assert_eq!(m.pop_back(), None);
|
|
|
assert_eq!(m.pop_front(), None);
|
|
|
m.push_front(1);
|
|
|
assert_eq!(m.pop_front(), Some(1));
|
|
|
m.push_back(2);
|
|
|
m.push_back(3);
|
|
|
assert_eq!(m.len(), 2);
|
|
|
assert_eq!(m.pop_front(), Some(2));
|
|
|
assert_eq!(m.pop_front(), Some(3));
|
|
|
assert_eq!(m.len(), 0);
|
|
|
assert_eq!(m.pop_front(), None);
|
|
|
m.push_back(1);
|
|
|
m.push_back(3);
|
|
|
m.push_back(5);
|
|
|
m.push_back(7);
|
|
|
assert_eq!(m.pop_front(), Some(1));
|
|
|
|
|
|
let mut n = LinkedList::new();
|
|
|
n.push_front(2);
|
|
|
n.push_front(3);
|
|
|
{
|
|
|
assert_eq!(n.front().unwrap(), &3);
|
|
|
let x = n.front_mut().unwrap();
|
|
|
assert_eq!(*x, 3);
|
|
|
*x = 0;
|
|
|
}
|
|
|
{
|
|
|
assert_eq!(n.back().unwrap(), &2);
|
|
|
let y = n.back_mut().unwrap();
|
|
|
assert_eq!(*y, 2);
|
|
|
*y = 1;
|
|
|
}
|
|
|
assert_eq!(n.pop_front(), Some(0));
|
|
|
assert_eq!(n.pop_front(), Some(1));
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_iterator() {
|
|
|
let m = generate_test();
|
|
|
for (i, elt) in m.iter().enumerate() {
|
|
|
assert_eq!(i as i32, *elt);
|
|
|
}
|
|
|
let mut n = LinkedList::new();
|
|
|
assert_eq!(n.iter().next(), None);
|
|
|
n.push_front(4);
|
|
|
let mut it = n.iter();
|
|
|
assert_eq!(it.size_hint(), (1, Some(1)));
|
|
|
assert_eq!(it.next().unwrap(), &4);
|
|
|
assert_eq!(it.size_hint(), (0, Some(0)));
|
|
|
assert_eq!(it.next(), None);
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_iterator_double_end() {
|
|
|
let mut n = LinkedList::new();
|
|
|
assert_eq!(n.iter().next(), None);
|
|
|
n.push_front(4);
|
|
|
n.push_front(5);
|
|
|
n.push_front(6);
|
|
|
let mut it = n.iter();
|
|
|
assert_eq!(it.size_hint(), (3, Some(3)));
|
|
|
assert_eq!(it.next().unwrap(), &6);
|
|
|
assert_eq!(it.size_hint(), (2, Some(2)));
|
|
|
assert_eq!(it.next_back().unwrap(), &4);
|
|
|
assert_eq!(it.size_hint(), (1, Some(1)));
|
|
|
assert_eq!(it.next_back().unwrap(), &5);
|
|
|
assert_eq!(it.next_back(), None);
|
|
|
assert_eq!(it.next(), None);
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_rev_iter() {
|
|
|
let m = generate_test();
|
|
|
for (i, elt) in m.iter().rev().enumerate() {
|
|
|
assert_eq!(6 - i as i32, *elt);
|
|
|
}
|
|
|
let mut n = LinkedList::new();
|
|
|
assert_eq!(n.iter().rev().next(), None);
|
|
|
n.push_front(4);
|
|
|
let mut it = n.iter().rev();
|
|
|
assert_eq!(it.size_hint(), (1, Some(1)));
|
|
|
assert_eq!(it.next().unwrap(), &4);
|
|
|
assert_eq!(it.size_hint(), (0, Some(0)));
|
|
|
assert_eq!(it.next(), None);
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_mut_iter() {
|
|
|
let mut m = generate_test();
|
|
|
let mut len = m.len();
|
|
|
for (i, elt) in m.iter_mut().enumerate() {
|
|
|
assert_eq!(i as i32, *elt);
|
|
|
len -= 1;
|
|
|
}
|
|
|
assert_eq!(len, 0);
|
|
|
let mut n = LinkedList::new();
|
|
|
assert!(n.iter_mut().next().is_none());
|
|
|
n.push_front(4);
|
|
|
n.push_back(5);
|
|
|
let mut it = n.iter_mut();
|
|
|
assert_eq!(it.size_hint(), (2, Some(2)));
|
|
|
assert!(it.next().is_some());
|
|
|
assert!(it.next().is_some());
|
|
|
assert_eq!(it.size_hint(), (0, Some(0)));
|
|
|
assert!(it.next().is_none());
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_iterator_mut_double_end() {
|
|
|
let mut n = LinkedList::new();
|
|
|
assert!(n.iter_mut().next_back().is_none());
|
|
|
n.push_front(4);
|
|
|
n.push_front(5);
|
|
|
n.push_front(6);
|
|
|
let mut it = n.iter_mut();
|
|
|
assert_eq!(it.size_hint(), (3, Some(3)));
|
|
|
assert_eq!(*it.next().unwrap(), 6);
|
|
|
assert_eq!(it.size_hint(), (2, Some(2)));
|
|
|
assert_eq!(*it.next_back().unwrap(), 4);
|
|
|
assert_eq!(it.size_hint(), (1, Some(1)));
|
|
|
assert_eq!(*it.next_back().unwrap(), 5);
|
|
|
assert!(it.next_back().is_none());
|
|
|
assert!(it.next().is_none());
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_eq() {
|
|
|
let mut n: LinkedList<u8> = list_from(&[]);
|
|
|
let mut m = list_from(&[]);
|
|
|
assert!(n == m);
|
|
|
n.push_front(1);
|
|
|
assert!(n != m);
|
|
|
m.push_back(1);
|
|
|
assert!(n == m);
|
|
|
|
|
|
let n = list_from(&[2, 3, 4]);
|
|
|
let m = list_from(&[1, 2, 3]);
|
|
|
assert!(n != m);
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_ord() {
|
|
|
let n = list_from(&[]);
|
|
|
let m = list_from(&[1, 2, 3]);
|
|
|
assert!(n < m);
|
|
|
assert!(m > n);
|
|
|
assert!(n <= n);
|
|
|
assert!(n >= n);
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_ord_nan() {
|
|
|
let nan = 0.0f64 / 0.0;
|
|
|
let n = list_from(&[nan]);
|
|
|
let m = list_from(&[nan]);
|
|
|
assert!(!(n < m));
|
|
|
assert!(!(n > m));
|
|
|
assert!(!(n <= m));
|
|
|
assert!(!(n >= m));
|
|
|
|
|
|
let n = list_from(&[nan]);
|
|
|
let one = list_from(&[1.0f64]);
|
|
|
assert!(!(n < one));
|
|
|
assert!(!(n > one));
|
|
|
assert!(!(n <= one));
|
|
|
assert!(!(n >= one));
|
|
|
|
|
|
let u = list_from(&[1.0f64, 2.0, nan]);
|
|
|
let v = list_from(&[1.0f64, 2.0, 3.0]);
|
|
|
assert!(!(u < v));
|
|
|
assert!(!(u > v));
|
|
|
assert!(!(u <= v));
|
|
|
assert!(!(u >= v));
|
|
|
|
|
|
let s = list_from(&[1.0f64, 2.0, 4.0, 2.0]);
|
|
|
let t = list_from(&[1.0f64, 2.0, 3.0, 2.0]);
|
|
|
assert!(!(s < t));
|
|
|
assert!(s > one);
|
|
|
assert!(!(s <= one));
|
|
|
assert!(s >= one);
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_debug() {
|
|
|
let list: LinkedList<i32> = (0..10).collect();
|
|
|
assert_eq!(format!("{:?}", list), "[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]");
|
|
|
|
|
|
let list: LinkedList<&str> = vec!["just", "one", "test", "more"]
|
|
|
.iter()
|
|
|
.copied()
|
|
|
.collect();
|
|
|
assert_eq!(format!("{:?}", list), r#"["just", "one", "test", "more"]"#);
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_hashmap() {
|
|
|
// Check that HashMap works with this as a key
|
|
|
|
|
|
let list1: LinkedList<i32> = (0..10).collect();
|
|
|
let list2: LinkedList<i32> = (1..11).collect();
|
|
|
let mut map = std::collections::HashMap::new();
|
|
|
|
|
|
assert_eq!(map.insert(list1.clone(), "list1"), None);
|
|
|
assert_eq!(map.insert(list2.clone(), "list2"), None);
|
|
|
|
|
|
assert_eq!(map.len(), 2);
|
|
|
|
|
|
assert_eq!(map.get(&list1), Some(&"list1"));
|
|
|
assert_eq!(map.get(&list2), Some(&"list2"));
|
|
|
|
|
|
assert_eq!(map.remove(&list1), Some("list1"));
|
|
|
assert_eq!(map.remove(&list2), Some("list2"));
|
|
|
|
|
|
assert!(map.is_empty());
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_cursor_move_peek() {
|
|
|
let mut m: LinkedList<u32> = LinkedList::new();
|
|
|
m.extend([1, 2, 3, 4, 5, 6]);
|
|
|
let mut cursor = m.cursor_mut();
|
|
|
cursor.move_next();
|
|
|
assert_eq!(cursor.current(), Some(&mut 1));
|
|
|
assert_eq!(cursor.peek_next(), Some(&mut 2));
|
|
|
assert_eq!(cursor.peek_prev(), None);
|
|
|
assert_eq!(cursor.index(), Some(0));
|
|
|
cursor.move_prev();
|
|
|
assert_eq!(cursor.current(), None);
|
|
|
assert_eq!(cursor.peek_next(), Some(&mut 1));
|
|
|
assert_eq!(cursor.peek_prev(), Some(&mut 6));
|
|
|
assert_eq!(cursor.index(), None);
|
|
|
cursor.move_next();
|
|
|
cursor.move_next();
|
|
|
assert_eq!(cursor.current(), Some(&mut 2));
|
|
|
assert_eq!(cursor.peek_next(), Some(&mut 3));
|
|
|
assert_eq!(cursor.peek_prev(), Some(&mut 1));
|
|
|
assert_eq!(cursor.index(), Some(1));
|
|
|
|
|
|
let mut cursor = m.cursor_mut();
|
|
|
cursor.move_prev();
|
|
|
assert_eq!(cursor.current(), Some(&mut 6));
|
|
|
assert_eq!(cursor.peek_next(), None);
|
|
|
assert_eq!(cursor.peek_prev(), Some(&mut 5));
|
|
|
assert_eq!(cursor.index(), Some(5));
|
|
|
cursor.move_next();
|
|
|
assert_eq!(cursor.current(), None);
|
|
|
assert_eq!(cursor.peek_next(), Some(&mut 1));
|
|
|
assert_eq!(cursor.peek_prev(), Some(&mut 6));
|
|
|
assert_eq!(cursor.index(), None);
|
|
|
cursor.move_prev();
|
|
|
cursor.move_prev();
|
|
|
assert_eq!(cursor.current(), Some(&mut 5));
|
|
|
assert_eq!(cursor.peek_next(), Some(&mut 6));
|
|
|
assert_eq!(cursor.peek_prev(), Some(&mut 4));
|
|
|
assert_eq!(cursor.index(), Some(4));
|
|
|
}
|
|
|
|
|
|
#[test]
|
|
|
fn test_cursor_mut_insert() {
|
|
|
let mut m: LinkedList<u32> = LinkedList::new();
|
|
|
m.extend([1, 2, 3, 4, 5, 6]);
|
|
|
let mut cursor = m.cursor_mut();
|
|
|
cursor.move_next();
|
|
|
cursor.splice_before(Some(7).into_iter().collect());
|
|
|
cursor.splice_after(Some(8).into_iter().collect());
|
|
|
// check_links(&m);
|
|
|
assert_eq!(
|
|
|
m.iter().cloned().collect::<Vec<_>>(),
|
|
|
&[7, 1, 8, 2, 3, 4, 5, 6]
|
|
|
);
|
|
|
let mut cursor = m.cursor_mut();
|
|
|
cursor.move_next();
|
|
|
cursor.move_prev();
|
|
|
cursor.splice_before(Some(9).into_iter().collect());
|
|
|
cursor.splice_after(Some(10).into_iter().collect());
|
|
|
check_links(&m);
|
|
|
assert_eq!(
|
|
|
m.iter().cloned().collect::<Vec<_>>(),
|
|
|
&[10, 7, 1, 8, 2, 3, 4, 5, 6, 9]
|
|
|
);
|
|
|
|
|
|
/* remove_current not impl'd
|
|
|
let mut cursor = m.cursor_mut();
|
|
|
cursor.move_next();
|
|
|
cursor.move_prev();
|
|
|
assert_eq!(cursor.remove_current(), None);
|
|
|
cursor.move_next();
|
|
|
cursor.move_next();
|
|
|
assert_eq!(cursor.remove_current(), Some(7));
|
|
|
cursor.move_prev();
|
|
|
cursor.move_prev();
|
|
|
cursor.move_prev();
|
|
|
assert_eq!(cursor.remove_current(), Some(9));
|
|
|
cursor.move_next();
|
|
|
assert_eq!(cursor.remove_current(), Some(10));
|
|
|
check_links(&m);
|
|
|
assert_eq!(m.iter().cloned().collect::<Vec<_>>(), &[1, 8, 2, 3, 4, 5, 6]);
|
|
|
*/
|
|
|
|
|
|
let mut m: LinkedList<u32> = LinkedList::new();
|
|
|
m.extend([1, 8, 2, 3, 4, 5, 6]);
|
|
|
let mut cursor = m.cursor_mut();
|
|
|
cursor.move_next();
|
|
|
let mut p: LinkedList<u32> = LinkedList::new();
|
|
|
p.extend([100, 101, 102, 103]);
|
|
|
let mut q: LinkedList<u32> = LinkedList::new();
|
|
|
q.extend([200, 201, 202, 203]);
|
|
|
cursor.splice_after(p);
|
|
|
cursor.splice_before(q);
|
|
|
check_links(&m);
|
|
|
assert_eq!(
|
|
|
m.iter().cloned().collect::<Vec<_>>(),
|
|
|
&[200, 201, 202, 203, 1, 100, 101, 102, 103, 8, 2, 3, 4, 5, 6]
|
|
|
);
|
|
|
let mut cursor = m.cursor_mut();
|
|
|
cursor.move_next();
|
|
|
cursor.move_prev();
|
|
|
let tmp = cursor.split_before();
|
|
|
assert_eq!(m.into_iter().collect::<Vec<_>>(), &[]);
|
|
|
m = tmp;
|
|
|
let mut cursor = m.cursor_mut();
|
|
|
cursor.move_next();
|
|
|
cursor.move_next();
|
|
|
cursor.move_next();
|
|
|
cursor.move_next();
|
|
|
cursor.move_next();
|
|
|
cursor.move_next();
|
|
|
cursor.move_next();
|
|
|
let tmp = cursor.split_after();
|
|
|
assert_eq!(
|
|
|
tmp.into_iter().collect::<Vec<_>>(),
|
|
|
&[102, 103, 8, 2, 3, 4, 5, 6]
|
|
|
);
|
|
|
check_links(&m);
|
|
|
assert_eq!(
|
|
|
m.iter().cloned().collect::<Vec<_>>(),
|
|
|
&[200, 201, 202, 203, 1, 100, 101]
|
|
|
);
|
|
|
}
|
|
|
|
|
|
fn check_links<T: Eq + std::fmt::Debug>(list: &LinkedList<T>) {
|
|
|
let from_front: Vec<_> = list.iter().collect();
|
|
|
let from_back: Vec<_> = list.iter().rev().collect();
|
|
|
let re_reved: Vec<_> = from_back.into_iter().rev().collect();
|
|
|
|
|
|
assert_eq!(from_front, re_reved);
|
|
|
}
|
|
|
}
|
|
|
<span class="boring">}</span></code></pre></pre>
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