Struct EntityId 

pub struct EntityId(pub i32);

Strongly-typed entity identifier.

Wraps the i32 identifier from JSON input files. The newtype pattern prevents accidental confusion between entity IDs and collection indices (usize), which is a common source of bugs in systems with both ID-based lookup and index-based access. EntityId is used as the key in HashMap<EntityId, usize> lookup tables and as the value in cross-reference fields (e.g., Hydro::bus_id, Line::source_bus_id).

Why i32 and not String: All JSON entity schemas use integer IDs (i32). Integer keys are cheaper to hash, compare, and copy than strings — important because EntityId appears in every lookup table and cross-reference field. If a future input format requires string IDs, the newtype boundary isolates the change to EntityId’s internal representation and its From/Into impls.

Examples

use cobre_core::EntityId;

let id: EntityId = EntityId::from(42);
assert_eq!(id.to_string(), "42");

let raw: i32 = i32::from(id);
assert_eq!(raw, 42);

Tuple Fields

0: i32

Trait Implementations

impl Clone for EntityId

fn clone(&self) -> EntityId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EntityId

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

Formats the value using the given formatter.

impl Display for EntityId

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

Formats the value using the given formatter.

impl From<EntityId> for i32

fn from(id: EntityId) -> Self

Converts to this type from the input type.

impl From<i32> for EntityId

fn from(value: i32) -> Self

Converts to this type from the input type.

impl Hash for EntityId

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 PartialEq for EntityId

fn eq(&self, other: &EntityId) -> 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 Copy for EntityId

impl Eq for EntityId

impl StructuralPartialEq for EntityId