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use std::mem;
use std::ptr;
use hide::hide_mem_impl;
pub trait Clear {
fn clear(&mut self);
}
impl<T: ?Sized> Clear for T
where T: InitializableFromZeroed
{
#[inline]
fn clear(&mut self) {
let size = mem::size_of_val(self);
unsafe {
let ptr = self as *mut Self;
ptr::drop_in_place(ptr);
ptr::write_bytes(ptr as *mut u8, 0, size);
hide_mem_impl::<Self>(ptr);
Self::initialize(ptr);
}
}
}
pub trait InitializableFromZeroed {
unsafe fn initialize(place: *mut Self);
}
impl<T> InitializableFromZeroed for T
where T: Default
{
#[inline]
unsafe fn initialize(place: *mut Self) {
ptr::write(place, Default::default());
}
}
impl<T> InitializableFromZeroed for [T]
where T: ZeroSafe
{
#[inline]
unsafe fn initialize(_place: *mut Self) {}
}
pub unsafe trait ZeroSafe {}
unsafe impl<T: ?Sized> ZeroSafe for *const T {}
unsafe impl<T: ?Sized> ZeroSafe for *mut T {}
unsafe impl ZeroSafe for isize {}
unsafe impl ZeroSafe for usize {}
unsafe impl ZeroSafe for i8 {}
unsafe impl ZeroSafe for u8 {}
unsafe impl ZeroSafe for i16 {}
unsafe impl ZeroSafe for u16 {}
unsafe impl ZeroSafe for i32 {}
unsafe impl ZeroSafe for u32 {}
unsafe impl ZeroSafe for i64 {}
unsafe impl ZeroSafe for u64 {}
#[cfg(feature = "nightly")]
unsafe impl ZeroSafe for i128 {}
#[cfg(feature = "nightly")]
unsafe impl ZeroSafe for u128 {}