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use core::cell::UnsafeCell;
use core::{mem, ptr};
pub const fn ptr_size_bits() -> usize {
mem::size_of::<usize>() * 8
}
pub fn map_in_place_2<T, U, F: FnOnce(U, T) -> T>((k, v): (U, &mut T), f: F) {
unsafe {
let _promote_panic_to_abort = AbortOnPanic;
ptr::write(v, f(k, ptr::read(v)));
}
}
pub unsafe fn change_lifetime_const<'a, 'b, T>(x: &'a T) -> &'b T {
&*(x as *const T)
}
pub unsafe fn change_lifetime_mut<'a, 'b, T>(x: &'a mut T) -> &'b mut T {
&mut *(x as *mut T)
}
#[repr(transparent)]
pub struct SharedValue<T> {
value: UnsafeCell<T>,
}
impl<T: Clone> Clone for SharedValue<T> {
fn clone(&self) -> Self {
let inner = self.get().clone();
Self {
value: UnsafeCell::new(inner),
}
}
}
unsafe impl<T: Send> Send for SharedValue<T> {}
unsafe impl<T: Sync> Sync for SharedValue<T> {}
impl<T> SharedValue<T> {
pub const fn new(value: T) -> Self {
Self {
value: UnsafeCell::new(value),
}
}
pub fn get(&self) -> &T {
unsafe { &*self.value.get() }
}
pub fn get_mut(&mut self) -> &mut T {
unsafe { &mut *self.value.get() }
}
pub fn into_inner(self) -> T {
self.value.into_inner()
}
pub(crate) fn as_ptr(&self) -> *mut T {
self.value.get()
}
}
struct AbortOnPanic;
impl Drop for AbortOnPanic {
fn drop(&mut self) {
if std::thread::panicking() {
std::process::abort()
}
}
}