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use std::fmt::Debug;
use std::hash::Hash;
use std::ops;
use std::slice::SliceIndex;
/// Represents some newtyped `usize` wrapper.
///
/// Purpose: avoid mixing indexes for different bitvector domains.
pub trait Idx: Copy + 'static + Eq + PartialEq + Debug + Hash {
fn new(idx: usize) -> Self;
fn index(self) -> usize;
#[inline]
fn increment_by(&mut self, amount: usize) {
*self = self.plus(amount);
}
#[inline]
#[must_use = "Use `increment_by` if you wanted to update the index in-place"]
fn plus(self, amount: usize) -> Self {
Self::new(self.index() + amount)
}
}
impl Idx for usize {
#[inline]
fn new(idx: usize) -> Self {
idx
}
#[inline]
fn index(self) -> usize {
self
}
}
impl Idx for u32 {
#[inline]
fn new(idx: usize) -> Self {
assert!(idx <= u32::MAX as usize);
idx as u32
}
#[inline]
fn index(self) -> usize {
self as usize
}
}
/// Helper trait for indexing operations with a custom index type.
pub trait IntoSliceIdx<I, T: ?Sized> {
type Output: SliceIndex<T>;
fn into_slice_idx(self) -> Self::Output;
}
impl<I: Idx, T> IntoSliceIdx<I, [T]> for I {
type Output = usize;
#[inline]
fn into_slice_idx(self) -> Self::Output {
self.index()
}
}
impl<I, T> IntoSliceIdx<I, [T]> for ops::RangeFull {
type Output = ops::RangeFull;
#[inline]
fn into_slice_idx(self) -> Self::Output {
self
}
}
impl<I: Idx, T> IntoSliceIdx<I, [T]> for ops::Range<I> {
type Output = ops::Range<usize>;
#[inline]
fn into_slice_idx(self) -> Self::Output {
ops::Range { start: self.start.index(), end: self.end.index() }
}
}
impl<I: Idx, T> IntoSliceIdx<I, [T]> for ops::RangeFrom<I> {
type Output = ops::RangeFrom<usize>;
#[inline]
fn into_slice_idx(self) -> Self::Output {
ops::RangeFrom { start: self.start.index() }
}
}
impl<I: Idx, T> IntoSliceIdx<I, [T]> for ops::RangeTo<I> {
type Output = ops::RangeTo<usize>;
#[inline]
fn into_slice_idx(self) -> Self::Output {
..self.end.index()
}
}
impl<I: Idx, T> IntoSliceIdx<I, [T]> for ops::RangeInclusive<I> {
type Output = ops::RangeInclusive<usize>;
#[inline]
fn into_slice_idx(self) -> Self::Output {
ops::RangeInclusive::new(self.start().index(), self.end().index())
}
}
impl<I: Idx, T> IntoSliceIdx<I, [T]> for ops::RangeToInclusive<I> {
type Output = ops::RangeToInclusive<usize>;
#[inline]
fn into_slice_idx(self) -> Self::Output {
..=self.end.index()
}
}
#[cfg(feature = "nightly")]
impl<I: Idx, T> IntoSliceIdx<I, [T]> for core::range::Range<I> {
type Output = core::range::Range<usize>;
#[inline]
fn into_slice_idx(self) -> Self::Output {
core::range::Range { start: self.start.index(), end: self.end.index() }
}
}
#[cfg(feature = "nightly")]
impl<I: Idx, T> IntoSliceIdx<I, [T]> for core::range::RangeFrom<I> {
type Output = core::range::RangeFrom<usize>;
#[inline]
fn into_slice_idx(self) -> Self::Output {
core::range::RangeFrom { start: self.start.index() }
}
}
#[cfg(feature = "nightly")]
impl<I: Idx, T> IntoSliceIdx<I, [T]> for core::range::RangeInclusive<I> {
type Output = core::range::RangeInclusive<usize>;
#[inline]
#[cfg(bootstrap)]
fn into_slice_idx(self) -> Self::Output {
core::range::RangeInclusive { start: self.start.index(), end: self.end.index() }
}
#[inline]
#[cfg(not(bootstrap))]
fn into_slice_idx(self) -> Self::Output {
core::range::RangeInclusive { start: self.start.index(), last: self.last.index() }
}
}
#[cfg(all(feature = "nightly", not(bootstrap)))]
impl<I: Idx, T> IntoSliceIdx<I, [T]> for core::range::RangeToInclusive<I> {
type Output = core::range::RangeToInclusive<usize>;
#[inline]
fn into_slice_idx(self) -> Self::Output {
core::range::RangeToInclusive { last: self.last.index() }
}
}
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