use fmt;
use hash;
use marker::{PhantomData, Unsize};
-use mem;
+use mem::{self, MaybeUninit};
use nonzero::NonZero;
use cmp::Ordering::{self, Less, Equal, Greater};
#[stable(feature = "rust1", since = "1.0.0")]
pub unsafe fn swap<T>(x: *mut T, y: *mut T) {
// Give ourselves some scratch space to work with
- let mut tmp: T = mem::uninitialized();
+ let mut tmp = MaybeUninit::<T>::uninitialized();
// Perform the swap
- copy_nonoverlapping(x, &mut tmp, 1);
+ copy_nonoverlapping(x, tmp.get_mut(), 1);
copy(y, x, 1); // `x` and `y` may overlap
- copy_nonoverlapping(&tmp, y, 1);
-
- // y and t now point to the same thing, but we need to completely forget `tmp`
- // because it's no longer relevant.
- mem::forget(tmp);
+ copy_nonoverlapping(tmp.get_ref(), y, 1);
}
/// Swaps a sequence of values at two mutable locations of the same type.
while i + block_size <= len {
// Create some uninitialized memory as scratch space
// Declaring `t` here avoids aligning the stack when this loop is unused
- let mut t: Block = mem::uninitialized();
- let t = &mut t as *mut _ as *mut u8;
+ let mut t = mem::MaybeUninit::<Block>::uninitialized();
+ let t = t.as_mut_ptr() as *mut u8;
let x = x.add(i);
let y = y.add(i);
if i < len {
// Swap any remaining bytes
- let mut t: UnalignedBlock = mem::uninitialized();
+ let mut t = mem::MaybeUninit::<UnalignedBlock>::uninitialized();
let rem = len - i;
- let t = &mut t as *mut _ as *mut u8;
+ let t = t.as_mut_ptr() as *mut u8;
let x = x.add(i);
let y = y.add(i);
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
pub unsafe fn read<T>(src: *const T) -> T {
- let mut tmp: T = mem::uninitialized();
- copy_nonoverlapping(src, &mut tmp, 1);
- tmp
+ let mut tmp = MaybeUninit::<T>::uninitialized();
+ copy_nonoverlapping(src, tmp.get_mut(), 1);
+ tmp.into_inner()
}
/// Reads the value from `src` without moving it. This leaves the
#[inline]
#[stable(feature = "ptr_unaligned", since = "1.17.0")]
pub unsafe fn read_unaligned<T>(src: *const T) -> T {
- let mut tmp: T = mem::uninitialized();
+ let mut tmp = MaybeUninit::<T>::uninitialized();
copy_nonoverlapping(src as *const u8,
- &mut tmp as *mut T as *mut u8,
+ tmp.as_mut_ptr() as *mut u8,
mem::size_of::<T>());
- tmp
+ tmp.into_inner()
}
/// Overwrites a memory location with the given value without reading or