Struct Index 

pub struct Index<T> { /* private fields */ }

A type-safe, compact handle to an element in an ElemPool.

An Index<T> is essentially a wrapper around a u32, providing a cheap, Copy-able way to reference list elements without relying on raw pointers or garbage collection.

Rationale

Using a custom Index type instead of a raw usize or u32 provides several benefits:

• Type Safety: Index<Foo> is a different type from Index<Bar>. This prevents accidentally using an index from a pool of Foos to access a pool of Bars. The PhantomData<T> marker enforces this at compile time with zero runtime cost.
• “None” State: The maximum value of u32 is reserved for Index::NONE, creating a clear, efficient “null” or “invalid” state, similar to Option<T> but without the added size overhead.

Implementations

impl<T> Index<T>

pub const NONE: Self

pub fn is_some(&self) -> bool

pub fn is_none(&self) -> bool

Trait Implementations

impl<T> Clone for Index<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Index<T>

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

Formats the value using the given formatter.

impl<T> Default for Index<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T> Display for Index<T>

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

Formats the value using the given formatter.

impl<T> From<u32> for Index<T>

fn from(ndx: u32) -> Index<T>

Converts to this type from the input type.

impl<T> From<usize> for Index<T>

fn from(index: usize) -> Index<T>

Converts to this type from the input type.

impl<T> Hash for Index<T>

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> Ord for Index<T>

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T> PartialEq for Index<T>

fn eq(&self, other: &Self) -> 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<T> PartialOrd for Index<T>

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T> Copy for Index<T>

impl<T> Eq for Index<T>