Struct ListHead

pub struct ListHead<'cx, T> { /* private fields */ }

Implementations

impl<T> ListHead<'_, T>

pub fn capacity(&self) -> usize

pub fn as_cells(&self) -> &[ListCell<T>]

Borrow the List’s slice of cells

Note that like with Vec, this slice may move after appending to the List! Due to lifetimes this isn’t a problem until unsafe Rust becomes involved, but with Postgres extensions it often does.

pub fn as_cells_ptr(&self) -> *const ListCell<T>

pub fn as_mut_cells_ptr(&mut self) -> *mut ListCell<T>

impl<T: Enlist> ListHead<'_, T>

pub fn push(&mut self, value: T) -> &mut Self

pub fn reserve(&mut self, count: usize) -> &mut Self

impl<T: Enlist> ListHead<'_, T>

pub unsafe fn downcast_ptr_in_memcx<'cx>( list: NonNull<List>, _memcx: &'cx MemCx<'_>, ) -> Option<ListHead<'cx, T>>

From a non-nullable pointer that points to a valid List, produce a ListHead of the correct type

Safety

This assumes the NodeTag is valid to read, so it is not okay to call this on pointers to deallocated or uninit data.

If it returns as Some, it also asserts the entire List is, across its length, validly initialized as T in each ListCell.

impl<T> ListHead<'_, T>

pub fn len(&self) -> usize

Trait Implementations

impl<'cx, T: Debug> Debug for ListHead<'cx, T>

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

Formats the value using the given formatter.