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use std::sync::atomic::{AtomicU64, Ordering};
use linkme::distributed_slice;
use crate::World;
static NEXT_UID: AtomicU64 = AtomicU64::new(0);
/// Unique entity ID.
#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct Uid
{
inner: u64,
}
impl Uid
{
pub fn new(uid: u64) -> Self
{
debug_assert!(
uid < NEXT_UID.load(Ordering::Relaxed),
"Invalid entity UID {uid}"
);
Self { inner: uid }
}
pub fn new_unique() -> Self
{
Self {
inner: NEXT_UID.fetch_add(1, Ordering::Relaxed),
}
}
}
#[macro_export]
macro_rules! static_entity {
($visibility: vis $ident: ident, $components: expr) => {
$visibility static $ident: ::std::sync::LazyLock<$crate::entity::Uid> =
::std::sync::LazyLock::new(|| $crate::entity::Uid::new_unique());
$crate::private::paste::paste! {
mod [<__ecs_ $ident:lower _static_entity_priv>] {
use super::*;
#[$crate::private::linkme::distributed_slice(
$crate::entity::CREATE_STATIC_ENTITIES
)]
#[linkme(crate=$crate::private::linkme)]
static CREATE_STATIC_ENTITY: fn(&$crate::World) = |world| {
world.create_entity_with_uid($components, *$ident);
};
}
}
}
}
#[distributed_slice]
#[doc(hidden)]
pub static CREATE_STATIC_ENTITIES: [fn(&World)];
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