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Implement Update for Option<T>

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Jack Rickard 2024-06-21 14:37:12 +01:00
parent f706aa2d32
commit db4c0de45c
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1 changed files with 17 additions and 0 deletions
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17
src/update.rs
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@ -360,3 +360,20 @@ tuple_impl!(A, B, C, D, E, F, G, H, I; a, b, c, d, e, f, g, h, i);
tuple_impl!(A, B, C, D, E, F, G, H, I, J; a, b, c, d, e, f, g, h, i, j);
tuple_impl!(A, B, C, D, E, F, G, H, I, J, K; a, b, c, d, e, f, g, h, i, j, k);
tuple_impl!(A, B, C, D, E, F, G, H, I, J, K, L; a, b, c, d, e, f, g, h, i, j, k, l);
unsafe impl<T> Update for Option<T>
where
T: Update,
{
unsafe fn maybe_update(old_pointer: *mut Self, new_value: Self) -> bool {
let old_value = unsafe { &mut *old_pointer };
match (old_value, new_value) {
(Some(old), Some(new)) => T::maybe_update(old, new),
(None, None) => false,
(old_value, new_value) => {
*old_value = new_value;
true
}
}
}
}