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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
// In this case consistency between impls is more important
// than using pointer casts
#![allow(clippy::transmute_ptr_to_ptr)]
use crate::ZeroFrom;
macro_rules! impl_copy_type {
($ty:ident) => {
impl<'a> ZeroFrom<'a, $ty> for $ty {
#[inline]
fn zero_from(this: &'a Self) -> Self {
// Essentially only works when the struct is fully Copy
*this
}
}
};
}
impl_copy_type!(u8);
impl_copy_type!(u16);
impl_copy_type!(u32);
impl_copy_type!(u64);
impl_copy_type!(u128);
impl_copy_type!(usize);
impl_copy_type!(i8);
impl_copy_type!(i16);
impl_copy_type!(i32);
impl_copy_type!(i64);
impl_copy_type!(i128);
impl_copy_type!(isize);
impl_copy_type!(char);
impl_copy_type!(bool);
// This can be cleaned up once `[T; N]`::each_ref() is stabilized
// https://github.com/rust-lang/rust/issues/76118
macro_rules! array_zf_impl {
($n:expr; $($i:expr),+) => {
impl<'a, C, T: ZeroFrom<'a, C>> ZeroFrom<'a, [C; $n]> for [T; $n] {
fn zero_from(this: &'a [C; $n]) -> Self {
[
$(
<T as ZeroFrom<C>>::zero_from(&this[$i])
),+
]
}
}
}
}
array_zf_impl!(1; 0);
array_zf_impl!(2; 0, 1);
array_zf_impl!(3; 0, 1, 2);
array_zf_impl!(4; 0, 1, 2, 3);
array_zf_impl!(5; 0, 1, 2, 3, 4);
array_zf_impl!(6; 0, 1, 2, 3, 4, 5);
array_zf_impl!(7; 0, 1, 2, 3, 4, 5, 6);
array_zf_impl!(8; 0, 1, 2, 3, 4, 5, 6, 7);
array_zf_impl!(9; 0, 1, 2, 3, 4, 5, 6, 7, 8);
array_zf_impl!(10; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
array_zf_impl!(11; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
array_zf_impl!(12; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);
array_zf_impl!(13; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
array_zf_impl!(14; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
array_zf_impl!(15; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14);
array_zf_impl!(16; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
macro_rules! tuple_zf_impl {
($(($c:ident, $t:ident, $i:tt)),+) => {
impl<'zf, $($c, $t: ZeroFrom<'zf, $c>),+> ZeroFrom<'zf, ($($c),+)>
for ($($t),+)
{
fn zero_from(other: &'zf ($($c),+)) -> Self {
(
$(<$t as ZeroFrom<$c>>::zero_from(&other.$i)),+
)
}
}
};
}
tuple_zf_impl!((C1, T1, 0), (C2, T2, 1));
tuple_zf_impl!((C1, T1, 0), (C2, T2, 1), (C3, T3, 2));
tuple_zf_impl!((C1, T1, 0), (C2, T2, 1), (C3, T3, 2), (C4, T4, 3));
tuple_zf_impl!(
(C1, T1, 0),
(C2, T2, 1),
(C3, T3, 2),
(C4, T4, 3),
(C5, T5, 4)
);
tuple_zf_impl!(
(C1, T1, 0),
(C2, T2, 1),
(C3, T3, 2),
(C4, T4, 3),
(C5, T5, 4),
(C6, T6, 5)
);
tuple_zf_impl!(
(C1, T1, 0),
(C2, T2, 1),
(C3, T3, 2),
(C4, T4, 3),
(C5, T5, 4),
(C6, T6, 5),
(C7, T7, 6)
);
tuple_zf_impl!(
(C1, T1, 0),
(C2, T2, 1),
(C3, T3, 2),
(C4, T4, 3),
(C5, T5, 4),
(C6, T6, 5),
(C7, T7, 6),
(C8, T8, 7)
);
tuple_zf_impl!(
(C1, T1, 0),
(C2, T2, 1),
(C3, T3, 2),
(C4, T4, 3),
(C5, T5, 4),
(C6, T6, 5),
(C7, T7, 6),
(C8, T8, 7),
(C9, T9, 8)
);
tuple_zf_impl!(
(C1, T1, 0),
(C2, T2, 1),
(C3, T3, 2),
(C4, T4, 3),
(C5, T5, 4),
(C6, T6, 5),
(C7, T7, 6),
(C8, T8, 7),
(C9, T9, 8),
(C10, T10, 9)
);
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