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use crate::Zeroable;
use bytemuck::Pod;
use core::{
cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd},
fmt::{self, Debug},
hash::{Hash, Hasher},
marker::PhantomData,
mem,
};
#[repr(C)]
pub struct AssertZeroable<T: ?Sized>(PhantomData<T>);
const _ZERO_SIZED: [(); 1 - core::mem::size_of::<AssertZeroable<()>>()] = [()];
impl<T> AssertZeroable<T>
where
T: Zeroable + ?Sized,
{
pub const NEW: Self = AssertZeroable(PhantomData);
}
impl<T> AssertZeroable<T> {
#[inline(always)]
pub fn zeroed(self) -> T {
unsafe { mem::zeroed() }
}
}
unsafe impl<T> Zeroable for AssertZeroable<T> where T: Zeroable {}
unsafe impl<T> Pod for AssertZeroable<T> where T: Pod {}
impl<T: ?Sized> Copy for AssertZeroable<T> {}
impl<T: ?Sized> Clone for AssertZeroable<T> {
fn clone(&self) -> Self {
*self
}
}
impl<T: ?Sized> PartialEq for AssertZeroable<T> {
#[inline]
fn eq(&self, _other: &Self) -> bool {
true
}
}
impl<T: ?Sized> Eq for AssertZeroable<T> {}
impl<T: ?Sized> PartialOrd for AssertZeroable<T> {
#[inline]
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl<T: ?Sized> Ord for AssertZeroable<T> {
#[inline]
fn cmp(&self, _other: &Self) -> Ordering {
Ordering::Equal
}
}
impl<T: ?Sized> Hash for AssertZeroable<T> {
fn hash<H>(&self, state: &mut H)
where
H: Hasher,
{
().hash(state)
}
}
impl<T: ?Sized> Debug for AssertZeroable<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut ds = f.debug_struct("AssertZeroable");
#[cfg(feature = "print_type")]
let ds = ds.field("type", &core::any::type_name::<T>());
ds.finish()
}
}