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#![allow(dead_code)]
use core::ffi::c_void;
use core::mem::{align_of, size_of};
use core::ptr::{null, null_mut, NonNull};
/// Convert a `&T` into a `*const T` without using an `as`.
#[inline]
pub(crate) const fn as_ptr<T>(t: &T) -> *const T {
t
}
/// Convert a `&mut T` into a `*mut T` without using an `as`.
#[inline]
pub(crate) fn as_mut_ptr<T>(t: &mut T) -> *mut T {
t
}
/// Convert an `Option<&T>` into a possibly-null `*const T`.
#[inline]
pub(crate) const fn option_as_ptr<T>(t: Option<&T>) -> *const T {
match t {
Some(t) => t,
None => null(),
}
}
/// Convert an `Option<&mut T>` into a possibly-null `*mut T`.
#[inline]
pub(crate) fn option_as_mut_ptr<T>(t: Option<&mut T>) -> *mut T {
match t {
Some(t) => t,
None => null_mut(),
}
}
/// Convert a `*mut c_void` to a `*mut T`, checking that it is not null,
/// misaligned, or pointing to a region of memory that wraps around the address
/// space.
pub(crate) fn check_raw_pointer<T>(value: *mut c_void) -> Option<NonNull<T>> {
if (value as usize).checked_add(size_of::<T>()).is_none()
|| (value as usize) % align_of::<T>() != 0
{
return None;
}
NonNull::new(value.cast())
}
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