engine-ecs/src/bundle.rs


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use seq_macro::seq;

use crate::component::{IntoParts, Parts};
use crate::util::Array;

pub trait Bundle
{
    type PartsArray: Array<Parts>;

    fn cnt(&self) -> usize;

    fn into_parts_array(self) -> Self::PartsArray;
}

macro_rules! gen_tuple_impls {
    ($c: tt) => {
        seq!(I in 0..$c {
            impl<#(IntoCompParts~I: IntoParts,)*> Bundle for (#(IntoCompParts~I,)*)
            {
                type PartsArray = [Parts; $c];

                fn cnt(&self) -> usize
                {
                    $c
                }

                fn into_parts_array(self) -> Self::PartsArray
                {
                    [#({
                        self.I.into_parts()
                    },)*]
                }
            }
        });
    };
}

seq!(C in 0..17 {
    gen_tuple_impls!(C);
});