use core::{cell::UnsafeCell, mem, sync::atomic};
pub unsafe trait ZeroInit {}
unsafe impl<T> ZeroInit for atomic::AtomicPtr<T> {}
unsafe impl<T: ZeroInit> ZeroInit for UnsafeCell<T> {}
unsafe impl<T> ZeroInit for mem::MaybeUninit<T> {}
unsafe impl<T: ZeroInit> ZeroInit for [T] {}
unsafe impl<T: ?Sized> ZeroInit for *const T {}
unsafe impl<T: ?Sized> ZeroInit for *mut T {}
unsafe impl<T: ?Sized> ZeroInit for Option<&'_ T> {}
unsafe impl<T: ?Sized> ZeroInit for Option<&'_ mut T> {}
macro_rules! impl_zero_init {
(
$(
$( #[$meta:meta] )*
$ty:ty,
)*
) => {
$(
$( #[$meta] )*
unsafe impl ZeroInit for $ty {
}
)*
};
}
impl_zero_init! {
bool,
char,
u8,
u16,
u32,
u64,
u128,
i8,
i16,
i32,
i64,
i128,
usize,
isize,
f32,
f64,
#[cfg(target_has_atomic_load_store = "8")]
atomic::AtomicBool,
#[cfg(target_has_atomic_load_store = "8")]
atomic::AtomicU8,
#[cfg(target_has_atomic_load_store = "16")]
atomic::AtomicU16,
#[cfg(target_has_atomic_load_store = "32")]
atomic::AtomicU32,
#[cfg(target_has_atomic_load_store = "64")]
atomic::AtomicU64,
#[cfg(target_has_atomic_load_store = "ptr")]
atomic::AtomicUsize,
#[cfg(target_has_atomic_load_store = "8")]
atomic::AtomicI8,
#[cfg(target_has_atomic_load_store = "16")]
atomic::AtomicI16,
#[cfg(target_has_atomic_load_store = "32")]
atomic::AtomicI32,
#[cfg(target_has_atomic_load_store = "64")]
atomic::AtomicI64,
#[cfg(target_has_atomic_load_store = "ptr")]
atomic::AtomicIsize,
(),
}
unsafe impl<T, const LEN: usize> ZeroInit for [T; LEN] where T: ZeroInit {}
macro_rules! fn_impl_zero_init {
( $h:ident, $($t:ident,)* ) => {
unsafe impl<Ret, $h, $($t,)*> ZeroInit for Option<fn($h, $($t,)*) -> Ret> {
}
fn_impl_zero_init! { $($t,)* }
};
() => {};
}
fn_impl_zero_init! {
A, B, C, D, E, F, G, H, I, J, K, L,
}