Struct alloc::collections::linked_list::Cursor

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pub struct Cursor<'a, T: 'a, A: Allocator = Global> { /* private fields */ }
🔬This is a nightly-only experimental API. (linked_list_cursors #58533)
Expand description

A cursor over a LinkedList.

A Cursor is like an iterator, except that it can freely seek back-and-forth.

Cursors always rest between two elements in the list, and index in a logically circular way. To accommodate this, there is a “ghost” non-element that yields None between the head and tail of the list.

When created, cursors start at the front of the list, or the “ghost” non-element if the list is empty.

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impl<'a, T, A: Allocator> Cursor<'a, T, A>

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pub fn index(&self) -> Option<usize>

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Returns the cursor position index within the LinkedList.

This returns None if the cursor is currently pointing to the “ghost” non-element.

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pub fn move_next(&mut self)

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Moves the cursor to the next element of the LinkedList.

If the cursor is pointing to the “ghost” non-element then this will move it to the first element of the LinkedList. If it is pointing to the last element of the LinkedList then this will move it to the “ghost” non-element.

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pub fn move_prev(&mut self)

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Moves the cursor to the previous element of the LinkedList.

If the cursor is pointing to the “ghost” non-element then this will move it to the last element of the LinkedList. If it is pointing to the first element of the LinkedList then this will move it to the “ghost” non-element.

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pub fn current(&self) -> Option<&'a T>

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Returns a reference to the element that the cursor is currently pointing to.

This returns None if the cursor is currently pointing to the “ghost” non-element.

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pub fn peek_next(&self) -> Option<&'a T>

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Returns a reference to the next element.

If the cursor is pointing to the “ghost” non-element then this returns the first element of the LinkedList. If it is pointing to the last element of the LinkedList then this returns None.

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pub fn peek_prev(&self) -> Option<&'a T>

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Returns a reference to the previous element.

If the cursor is pointing to the “ghost” non-element then this returns the last element of the LinkedList. If it is pointing to the first element of the LinkedList then this returns None.

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pub fn front(&self) -> Option<&'a T>

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Provides a reference to the front element of the cursor’s parent list, or None if the list is empty.

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pub fn back(&self) -> Option<&'a T>

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Provides a reference to the back element of the cursor’s parent list, or None if the list is empty.

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pub fn as_list(&self) -> &'a LinkedList<T, A>

🔬This is a nightly-only experimental API. (linked_list_cursors #58533)

Provides a reference to the cursor’s parent list.

Trait Implementations§

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impl<T, A: Allocator> Clone for Cursor<'_, T, A>

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug, A: Allocator> Debug for Cursor<'_, T, A>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: Sync, A: Allocator + Sync> Send for Cursor<'_, T, A>

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impl<T: Sync, A: Allocator + Sync> Sync for Cursor<'_, T, A>

Auto Trait Implementations§

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impl<'a, T, A> Freeze for Cursor<'a, T, A>

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impl<'a, T, A> RefUnwindSafe for Cursor<'a, T, A>

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impl<'a, T, A> Unpin for Cursor<'a, T, A>

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impl<'a, T, A> UnwindSafe for Cursor<'a, T, A>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.