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use linkme::distributed_slice;
use crate::component::storage::archetype::{Archetype, Entity as ArchetypeEntity};
use crate::uid::Uid;
use crate::{EntityComponentRef, World};
/// A handle to a entity.
pub struct Handle<'a>
{
archetype: &'a Archetype,
entity: &'a ArchetypeEntity,
}
impl<'a> Handle<'a>
{
/// Returns the [`Uid`] of this entity.
#[inline]
#[must_use]
pub fn uid(&self) -> Uid
{
self.entity.uid()
}
#[inline]
#[must_use]
pub fn get_component(&self, component_uid: Uid) -> Option<EntityComponentRef<'a>>
{
let index = self.archetype.get_index_for_component(component_uid)?;
Some(EntityComponentRef::new(
self.entity.components().get(index).unwrap(),
))
}
pub(crate) fn new(archetype: &'a Archetype, entity: &'a ArchetypeEntity) -> Self
{
Self { archetype, entity }
}
}
#[allow(clippy::module_name_repetitions)]
#[macro_export]
macro_rules! static_entity {
($visibility: vis $ident: ident, $components: expr) => {
$visibility static $ident: ::std::sync::LazyLock<$crate::uid::Uid> =
::std::sync::LazyLock::new(|| {
$crate::uid::Uid::new_unique($crate::uid::Kind::Entity)
});
$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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