Struct EntityListNodeHead 

pub struct EntityListNodeHead<I: IPoliciedID> {
    pub prev: Option<I>,
    pub next: Option<I>,
}

Lightweight head metadata stored on each list node.

This small struct holds the previous and next node IDs for a node that participates in either a linked list or a ring list. It is intended to be embedded in entity storage so that list linkage does not require separate allocation.

The prev/next options are None when the node is detached. In the ring-list sentinel case both fields point to the sentinel itself.

Fields

prev: Option<I>

Previous node ID, if any.

next: Option<I>

Next node ID, if any.

Implementations

impl<I: IPoliciedID> EntityListNodeHead<I>

pub fn none() -> Self

Create a new empty (detached) node head.

pub fn new_full(prev: Option<I>, next: Option<I>) -> Self

Create a new node head with given prev/next IDs.

pub fn from_id(prev: I, next: I) -> Self

Create a new node head from given prev/next IDs (both non-None).

pub fn into_id(self) -> (Option<I>, Option<I>)

Decompose the node head into its prev/next IDs.

pub fn get_prev(&self) -> Option<I>

Get the previous node ID, if any.

pub fn get_next(&self) -> Option<I>

Get the next node ID, if any.

Trait Implementations

impl<I: Clone + IPoliciedID> Clone for EntityListNodeHead<I>

fn clone(&self) -> EntityListNodeHead<I>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<I: Debug + IPoliciedID> Debug for EntityListNodeHead<I>

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

Formats the value using the given formatter.

impl<I: PartialEq + IPoliciedID> PartialEq for EntityListNodeHead<I>

fn eq(&self, other: &EntityListNodeHead<I>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<I: Copy + IPoliciedID> Copy for EntityListNodeHead<I>

impl<I: Eq + IPoliciedID> Eq for EntityListNodeHead<I>

impl<I: IPoliciedID> StructuralPartialEq for EntityListNodeHead<I>