#![allow(unused_imports)]
#[macro_use]
#[allow(unstable_name_collisions)]
mod definitions {
#[cfg(not(all(feature = "allocator_api", feature = "new_uninit")))]
use alloc::alloc::Layout;
use alloc::boxed::Box;
use cfg_if::cfg_if;
use core::{cmp::Ordering, mem::MaybeUninit};
cfg_if! {
if #[cfg(feature = "allocator_api")] {
pub use alloc::alloc::{Allocator, Global};
} else {
use core::ptr::NonNull;
pub trait Allocator {
#[inline]
fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, ()> {
unsafe {
let len = layout.size();
let data = if len == 0 {
layout.align() as _
} else {
NonNull::new(alloc::alloc::alloc(layout)).ok_or(())?.as_ptr()
};
Ok(NonNull::new_unchecked(core::ptr::slice_from_raw_parts_mut(
data, len,
)))
}
}
#[inline]
unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
if layout.size() != 0 {
unsafe { alloc::alloc::dealloc(ptr.as_ptr(), layout) }
}
}
}
#[derive(Copy, Clone, Debug)]
pub struct Global;
impl Allocator for Global {}
}
}
cfg_if! {
if #[cfg(feature = "hasher_prefixfree_extras")] {
pub use core::hash::Hasher;
} else {
pub trait Hasher: core::hash::Hasher {
#[inline]
fn write_length_prefix(&mut self, len: usize) {
self.write_usize(len);
}
}
impl<H: core::hash::Hasher> Hasher for H {}
}
}
cfg_if! {
if #[cfg(feature = "core_intrinsics")] {
pub use core::intrinsics;
} else {
pub mod intrinsics {
pub fn abort() -> ! {
cfg_if::cfg_if! {
if #[cfg(feature = "std")] {
std::process::abort()
} else {
panic!()
}
}
}
}
}
}
cfg_if! {
if #[cfg(feature = "allocator_api")] {
macro_rules! A {
(Box<$t:ty$(, $a:ty)?>) => { Box<$t$(, $a)?> };
(Vec<$t:ty$(, $a:ty)?>) => { Vec<$t$(, $a)?> };
}
} else {
macro_rules! A {
(Box<$t:ty$(, $a:ty)?>) => { Box<$t> };
(Vec<$t:ty$(, $a:ty)?>) => { Vec<$t> };
}
}
}
pub trait NewUninit<T, A: Allocator = Global> {
type SelfWithAlloc<U: ?Sized, B: Allocator>;
#[cfg(not(feature = "allocator_api"))]
unsafe fn from_raw_in(ptr: *mut T, alloc: A) -> Self::SelfWithAlloc<T, Global>;
fn new_uninit_in(alloc: A) -> Self::SelfWithAlloc<MaybeUninit<T>, A>;
fn new_uninit() -> Self::SelfWithAlloc<MaybeUninit<T>, Global>;
}
pub trait AssumeInit<T, A: Allocator = Global>: NewUninit<MaybeUninit<T>, A> {
unsafe fn assume_init(self) -> Self::SelfWithAlloc<T, A>;
}
impl<T, A: Allocator> NewUninit<T, A> for A!(Box<T, A>) {
type SelfWithAlloc<U: ?Sized, B: Allocator> = A!(Box<U, B>);
#[cfg(not(feature = "allocator_api"))]
#[inline]
unsafe fn from_raw_in(ptr: *mut T, _: A) -> A!(Box<T, Global>) {
Self::from_raw(ptr)
}
#[inline]
fn new_uninit_in(alloc: A) -> A!(Box<MaybeUninit<T>, A>) {
cfg_if! {
if #[cfg(all(feature = "allocator_api", feature = "new_uninit"))] {
<A!(Box<_, _>)>::new_uninit_in(alloc)
} else {
unsafe {
let layout = Layout::new::<MaybeUninit<T>>();
match alloc.allocate(layout) {
Ok(ptr) => {
cfg_if! {
if #[cfg(feature = "allocator_api")] {
<A!(Box<_, _>)>::from_raw_in(ptr.cast().as_ptr(), alloc)
} else {
let _ = alloc;
<A!(Box<_, _>)>::from_raw(ptr.cast().as_ptr())
}
}
}
Err(_) => alloc::alloc::handle_alloc_error(layout),
}
}
}
}
}
#[inline]
fn new_uninit() -> A!(Box<MaybeUninit<T>>) {
cfg_if! {
if #[cfg(feature = "new_uninit")] {
<A!(Box<_>)>::new_uninit()
} else {
<A!(Box<_>)>::new_uninit_in(Global)
}
}
}
}
#[cfg(not(feature = "new_uninit"))]
cfg_if! {
if #[cfg(feature = "allocator_api")] {
impl<T, A: Allocator> AssumeInit<T, A> for A!(Box<MaybeUninit<T>, A>) {
#[inline]
unsafe fn assume_init(self) -> A!(Box<T, A>) {
let (raw, alloc) = Self::into_raw_with_allocator(self);
<A!(Box<_, _>)>::from_raw_in(raw as *mut T, alloc)
}
}
} else {
impl<T> AssumeInit<T, Global> for A!(Box<MaybeUninit<T>>) {
#[inline]
unsafe fn assume_init(self) -> A!(Box<T>) {
let raw = Self::into_raw(self);
<A!(Box<_>)>::from_raw(raw as *mut T)
}
}
}
}
pub trait MaybeUninitSlice<T> {
unsafe fn slice_assume_init_ref(slice: &[MaybeUninit<T>]) -> &[T];
}
#[cfg(not(feature = "maybe_uninit_slice"))]
impl<T> MaybeUninitSlice<T> for MaybeUninit<T> {
unsafe fn slice_assume_init_ref(slice: &[MaybeUninit<T>]) -> &[T] {
&*(slice as *const [MaybeUninit<T>] as *const [T])
}
}
pub trait SliceIndex<T: ?Sized>: core::slice::SliceIndex<T> {
unsafe fn get_unchecked(self, slice: *const T) -> *const Self::Output;
unsafe fn get_unchecked_mut(self, slice: *mut T) -> *mut Self::Output;
}
impl<T> SliceIndex<[T]> for usize {
unsafe fn get_unchecked(self, slice: *const [T]) -> *const T {
slice.as_ptr().add(self)
}
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut T {
slice.as_mut_ptr().add(self)
}
}
#[allow(clippy::wrong_self_convention)]
pub trait SlicePtrGet {
type Item;
fn as_ptr(self) -> *const Self::Item;
unsafe fn get_unchecked<I>(self, index: I) -> *const I::Output
where
I: SliceIndex<[Self::Item]>;
}
#[allow(clippy::wrong_self_convention)]
pub trait SlicePtrGetMut: SlicePtrGet {
fn as_mut_ptr(self) -> *mut Self::Item;
unsafe fn get_unchecked_mut<I>(self, index: I) -> *mut I::Output
where
I: SliceIndex<[Self::Item]>;
}
#[cfg(not(feature = "slice_ptr_get"))]
impl<T> SlicePtrGet for *const [T] {
type Item = T;
fn as_ptr(self) -> *const T {
self as *const T
}
unsafe fn get_unchecked<I>(self, index: I) -> *const I::Output
where
I: SliceIndex<[T]>,
{
index.get_unchecked(self)
}
}
#[cfg(not(feature = "slice_ptr_get"))]
impl<T> SlicePtrGet for *mut [T] {
type Item = T;
fn as_ptr(self) -> *const T {
self as *const T
}
unsafe fn get_unchecked<I>(self, index: I) -> *const I::Output
where
I: SliceIndex<[T]>,
{
index.get_unchecked(self)
}
}
#[cfg(not(feature = "slice_ptr_get"))]
impl<T> SlicePtrGetMut for *mut [T] {
fn as_mut_ptr(self) -> *mut T {
self as *mut T
}
unsafe fn get_unchecked_mut<I>(self, index: I) -> *mut I::Output
where
I: SliceIndex<[T]>,
{
index.get_unchecked_mut(self)
}
}
pub trait ExactSizeIsEmpty: ExactSizeIterator {
fn is_empty(&self) -> bool {
self.len() == 0
}
}
#[cfg(not(feature = "exact_size_is_empty"))]
impl<I: ExactSizeIterator> ExactSizeIsEmpty for I {}
macro_rules! decorate_if {
(
$(#[$attr:meta])*
if #[cfg($vis_m:meta)] { $(#[$vis_attr:meta])* $vis:vis }
if #[cfg($const:meta)] { const }
$($rest:tt)+
) => {
cfg_if::cfg_if! {
if #[cfg(all($vis_m, $const))] {
$(#[$attr])*
$(#[$vis_attr])*
#[cfg_attr(docsrs, doc(cfg($vis_m)))]
$vis const $($rest)+
} else if #[cfg($vis_m)] {
$(#[$attr])*
$(#[$vis_attr])*
#[cfg_attr(docsrs, doc(cfg($vis_m)))]
$vis $($rest)+
} else if #[cfg($const)] {
$(#[$attr])*
#[allow(dead_code)]
pub(crate) const $($rest)+
} else {
$(#[$attr])*
#[allow(dead_code)]
pub(crate) $($rest)+
}
}
};
(
$(#[$attr:meta])*
$vis:vis
if #[cfg($const:meta)] { const }
$($rest:tt)+
) => {
cfg_if::cfg_if! {
if #[cfg($const)] {
$(#[$attr])*
$vis const $($rest)+
} else {
$(#[$attr])*
$vis $($rest)+
}
}
};
(
$(#[$attr:meta])*
if #[cfg($vis_m:meta)] { $(#[$vis_attr:meta])* $vis:vis }
$($rest:tt)+
) => {
cfg_if::cfg_if! {
if #[cfg($vis_m)] {
$(#[$attr])*
$(#[$vis_attr])*
#[cfg_attr(docsrs, doc(cfg($vis_m)))]
$vis $($rest)+
} else {
$(#[$attr])*
#[allow(dead_code)]
pub(crate) $($rest)+
}
}
};
}
}
#[cfg(test)]
pub(crate) use definitions::ExactSizeIsEmpty as _;
pub(crate) use definitions::{
intrinsics, Allocator, AssumeInit as _, Global, Hasher as _, MaybeUninitSlice as _,
NewUninit as _, SlicePtrGet as _, SlicePtrGetMut as _,
};