use std::mem::MaybeUninit;
#[inline(always)]
pub const fn unlikely(b: bool) -> bool {
#[allow(clippy::needless_bool, clippy::bool_to_int_with_if)]
if (1i32).checked_div(if b { 0 } else { 1 }).is_none() {
true
} else {
false
}
}
#[derive(Clone, Copy)]
pub struct DisplayHash<'a>(pub &'a [u8; 32]);
impl std::fmt::Display for DisplayHash<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let mut output = [0u8; 64];
hex::encode_to_slice(self.0, &mut output).ok();
let output = unsafe { std::str::from_utf8_unchecked(&output) };
f.write_str(output)
}
}
impl std::fmt::Debug for DisplayHash<'_> {
#[inline(always)]
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self, f)
}
}
pub struct ArrayVec<T, const N: usize> {
inner: [MaybeUninit<T>; N],
len: u8,
}
impl<T, const N: usize> ArrayVec<T, N> {
const _ASSERT_LEN: () = assert!(N <= u8::MAX as usize);
#[inline]
pub fn len(&self) -> usize {
self.len as usize
}
#[inline]
pub fn is_empty(&self) -> bool {
self.len == 0
}
#[inline]
pub unsafe fn push(&mut self, item: T) {
debug_assert!((self.len as usize) < N);
*self.inner.get_unchecked_mut(self.len as usize) = MaybeUninit::new(item);
self.len += 1;
}
#[inline]
pub unsafe fn into_inner(self) -> [MaybeUninit<T>; N] {
let this = std::mem::ManuallyDrop::new(self);
std::ptr::read(&this.inner)
}
}
impl<T, const N: usize> Default for ArrayVec<T, N> {
#[inline]
fn default() -> Self {
Self {
inner: unsafe { MaybeUninit::<[MaybeUninit<T>; N]>::uninit().assume_init() },
len: 0,
}
}
}
impl<R, const N: usize> AsRef<[R]> for ArrayVec<R, N> {
#[inline]
fn as_ref(&self) -> &[R] {
unsafe { std::slice::from_raw_parts(self.inner.as_ptr() as *const R, self.len as usize) }
}
}
impl<T: Clone, const N: usize> Clone for ArrayVec<T, N> {
fn clone(&self) -> Self {
let mut res = Self::default();
for item in self.as_ref() {
unsafe { res.push(item.clone()) };
}
res
}
}
impl<T, const N: usize> Drop for ArrayVec<T, N> {
fn drop(&mut self) {
debug_assert!(self.len as usize <= N);
let references_ptr = self.inner.as_mut_ptr() as *mut T;
for i in 0..self.len {
unsafe { std::ptr::drop_in_place(references_ptr.add(i as usize)) };
}
}
}