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Infer StableInterpolate on tuples #15931

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Oct 15, 2024
Merged

Infer StableInterpolate on tuples #15931

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78 changes: 78 additions & 0 deletions crates/bevy_math/src/common_traits.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -309,3 +309,81 @@ impl StableInterpolate for Dir3A {
self.slerp(*other, t)
}
}

macro_rules! impl_stable_interpolate_tuple {
($(($T:ident, $n:tt)),*) => {
impl<$($T: StableInterpolate),*> StableInterpolate for ($($T,)*) {
fn interpolate_stable(&self, other: &Self, t: f32) -> Self {
(
$(
<$T as StableInterpolate>::interpolate_stable(&self.$n, &other.$n, t),
)*
)
}
}
};
}

// (See `macro_metavar_expr`, which might make this better.)
// This currently implements `StableInterpolate` for tuples of up to 11 elements.
impl_stable_interpolate_tuple!((T, 0));
impl_stable_interpolate_tuple!((T0, 0), (T1, 1));
impl_stable_interpolate_tuple!((T0, 0), (T1, 1), (T2, 2));
impl_stable_interpolate_tuple!((T0, 0), (T1, 1), (T2, 2), (T3, 3));
impl_stable_interpolate_tuple!((T0, 0), (T1, 1), (T2, 2), (T3, 3), (T4, 4));
impl_stable_interpolate_tuple!((T0, 0), (T1, 1), (T2, 2), (T3, 3), (T4, 4), (T5, 5));
impl_stable_interpolate_tuple!(
(T0, 0),
(T1, 1),
(T2, 2),
(T3, 3),
(T4, 4),
(T5, 5),
(T6, 6)
);
impl_stable_interpolate_tuple!(
(T0, 0),
(T1, 1),
(T2, 2),
(T3, 3),
(T4, 4),
(T5, 5),
(T6, 6),
(T7, 7)
);
impl_stable_interpolate_tuple!(
(T0, 0),
(T1, 1),
(T2, 2),
(T3, 3),
(T4, 4),
(T5, 5),
(T6, 6),
(T7, 7),
(T8, 8)
);
impl_stable_interpolate_tuple!(
(T0, 0),
(T1, 1),
(T2, 2),
(T3, 3),
(T4, 4),
(T5, 5),
(T6, 6),
(T7, 7),
(T8, 8),
(T9, 9)
);
impl_stable_interpolate_tuple!(
(T0, 0),
(T1, 1),
(T2, 2),
(T3, 3),
(T4, 4),
(T5, 5),
(T6, 6),
(T7, 7),
(T8, 8),
(T9, 9),
(T10, 10)
);