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use core::mem::ManuallyDrop;
#[derive(Copy)]
pub union MaybeUninit<T: Copy> {
uninit: (),
value: ManuallyDrop<T>,
}
impl<T: Copy> Clone for MaybeUninit<T> {
#[inline(always)]
fn clone(&self) -> Self {
*self
}
}
impl<T: Copy> MaybeUninit<T> {
#[inline(always)]
pub fn new(val: T) -> MaybeUninit<T> {
MaybeUninit {
value: ManuallyDrop::new(val),
}
}
#[inline(always)]
pub fn uninit() -> MaybeUninit<T> {
MaybeUninit { uninit: () }
}
#[inline]
pub fn zeroed() -> MaybeUninit<T> {
let mut u = MaybeUninit::<T>::uninit();
unsafe {
u.as_mut_ptr().write_bytes(0u8, 1);
}
u
}
#[inline(always)]
pub fn as_ptr(&self) -> *const T {
unsafe { &*self.value as *const T }
}
#[inline(always)]
pub fn as_mut_ptr(&mut self) -> *mut T {
unsafe { &mut *self.value as *mut T }
}
#[inline(always)]
pub unsafe fn assume_init(self) -> T {
ManuallyDrop::into_inner(self.value)
}
}
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