lyra-engine/lyra-ecs/src/bundle.rs

use std::any::{TypeId, Any};

use crate::{archetype::ComponentColumn, component::Component};

pub trait Bundle {
    // Get a list of type ids that this bundle is storing
    fn types(&self) -> Vec<TypeId>;
    /// Take components into a list.
    /// The return value could be seen as a list of a list of components, but that inner list
    /// only contains a single value to make it easier to add it to an archetype.
    fn take_components(self) -> Vec<Box<dyn ComponentColumn>>;
}

macro_rules! impl_bundle_tuple {
    ( $(($name: ident, $index: tt))+ ) => (
        impl<$($name: Component),+> Bundle for ($($name,)+) {
            fn types(&self) -> Vec<TypeId> {
                vec![$(self.$index.type_id()),+]
            }

            fn take_components(self) -> Vec<Box<dyn ComponentColumn>> {
                vec![$(Box::new(vec![self.$index])),+]
            }
        }
    );
}

// hopefully 16 components in a bundle is enough
impl_bundle_tuple! { (C1, 0) }
impl_bundle_tuple! { (C1, 0) (C2, 1) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) (C12, 11) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) (C12, 11) (C13, 12) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) (C12, 11) (C13, 12) (C14, 13) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) (C12, 11) (C13, 12) (C14, 13) (C15, 14) }