ecs/src/entity.rs


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use linkme::distributed_slice;

use crate::World;

#[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)];