mv std libs to library/
This commit is contained in:
mark
236
library/core/src/array/iter.rs
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236
library/core/src/array/iter.rs
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@@ -0,0 +1,236 @@
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//! Defines the `IntoIter` owned iterator for arrays.
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use crate::{
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fmt,
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iter::{ExactSizeIterator, FusedIterator, TrustedLen},
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mem::{self, MaybeUninit},
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ops::Range,
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ptr,
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};
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/// A by-value [array] iterator.
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///
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/// [array]: ../../std/primitive.array.html
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#[unstable(feature = "array_value_iter", issue = "65798")]
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pub struct IntoIter<T, const N: usize> {
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/// This is the array we are iterating over.
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///
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/// Elements with index `i` where `alive.start <= i < alive.end` have not
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/// been yielded yet and are valid array entries. Elements with indices `i
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/// < alive.start` or `i >= alive.end` have been yielded already and must
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/// not be accessed anymore! Those dead elements might even be in a
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/// completely uninitialized state!
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///
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/// So the invariants are:
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/// - `data[alive]` is alive (i.e. contains valid elements)
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/// - `data[..alive.start]` and `data[alive.end..]` are dead (i.e. the
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/// elements were already read and must not be touched anymore!)
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data: [MaybeUninit<T>; N],
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/// The elements in `data` that have not been yielded yet.
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///
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/// Invariants:
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/// - `alive.start <= alive.end`
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/// - `alive.end <= N`
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alive: Range<usize>,
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}
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impl<T, const N: usize> IntoIter<T, N> {
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/// Creates a new iterator over the given `array`.
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///
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/// *Note*: this method might never get stabilized and/or removed in the
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/// future as there will likely be another, preferred way of obtaining this
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/// iterator (either via `IntoIterator` for arrays or via another way).
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#[unstable(feature = "array_value_iter", issue = "65798")]
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pub fn new(array: [T; N]) -> Self {
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// SAFETY: The transmute here is actually safe. The docs of `MaybeUninit`
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// promise:
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//
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// > `MaybeUninit<T>` is guaranteed to have the same size and alignment
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// > as `T`.
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//
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// The docs even show a transmute from an array of `MaybeUninit<T>` to
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// an array of `T`.
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//
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// With that, this initialization satisfies the invariants.
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// FIXME(LukasKalbertodt): actually use `mem::transmute` here, once it
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// works with const generics:
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// `mem::transmute::<[T; {N}], [MaybeUninit<T>; {N}]>(array)`
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//
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// Until then, we do it manually here. We first create a bitwise copy
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// but cast the pointer so that it is treated as a different type. Then
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// we forget `array` so that it is not dropped.
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let data = unsafe {
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let data = ptr::read(&array as *const [T; N] as *const [MaybeUninit<T>; N]);
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mem::forget(array);
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data
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};
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Self { data, alive: 0..N }
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}
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/// Returns an immutable slice of all elements that have not been yielded
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/// yet.
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fn as_slice(&self) -> &[T] {
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let slice = &self.data[self.alive.clone()];
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// SAFETY: This transmute is safe. As mentioned in `new`, `MaybeUninit` retains
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// the size and alignment of `T`. Furthermore, we know that all
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// elements within `alive` are properly initialized.
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unsafe { mem::transmute::<&[MaybeUninit<T>], &[T]>(slice) }
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}
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/// Returns a mutable slice of all elements that have not been yielded yet.
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fn as_mut_slice(&mut self) -> &mut [T] {
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// This transmute is safe, same as in `as_slice` above.
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let slice = &mut self.data[self.alive.clone()];
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// SAFETY: This transmute is safe. As mentioned in `new`, `MaybeUninit` retains
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// the size and alignment of `T`. Furthermore, we know that all
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// elements within `alive` are properly initialized.
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unsafe { mem::transmute::<&mut [MaybeUninit<T>], &mut [T]>(slice) }
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}
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}
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#[stable(feature = "array_value_iter_impls", since = "1.40.0")]
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impl<T, const N: usize> Iterator for IntoIter<T, N> {
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type Item = T;
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fn next(&mut self) -> Option<Self::Item> {
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if self.alive.start == self.alive.end {
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return None;
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}
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// Bump start index.
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//
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// From the check above we know that `alive.start != alive.end`.
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// Combine this with the invariant `alive.start <= alive.end`, we know
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// that `alive.start < alive.end`. Increasing `alive.start` by 1
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// maintains the invariant regarding `alive`. However, due to this
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// change, for a short time, the alive zone is not `data[alive]`
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// anymore, but `data[idx..alive.end]`.
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let idx = self.alive.start;
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self.alive.start += 1;
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// Read the element from the array.
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// SAFETY: This is safe: `idx` is an index
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// into the "alive" region of the array. Reading this element means
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// that `data[idx]` is regarded as dead now (i.e. do not touch). As
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// `idx` was the start of the alive-zone, the alive zone is now
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// `data[alive]` again, restoring all invariants.
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let out = unsafe { self.data.get_unchecked(idx).read() };
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Some(out)
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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let len = self.len();
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(len, Some(len))
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}
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fn count(self) -> usize {
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self.len()
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}
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fn last(mut self) -> Option<Self::Item> {
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self.next_back()
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}
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}
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#[stable(feature = "array_value_iter_impls", since = "1.40.0")]
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impl<T, const N: usize> DoubleEndedIterator for IntoIter<T, N> {
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fn next_back(&mut self) -> Option<Self::Item> {
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if self.alive.start == self.alive.end {
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return None;
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}
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// Decrease end index.
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//
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// From the check above we know that `alive.start != alive.end`.
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// Combine this with the invariant `alive.start <= alive.end`, we know
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// that `alive.start < alive.end`. As `alive.start` cannot be negative,
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// `alive.end` is at least 1, meaning that we can safely decrement it
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// by one. This also maintains the invariant `alive.start <=
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// alive.end`. However, due to this change, for a short time, the alive
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// zone is not `data[alive]` anymore, but `data[alive.start..alive.end
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// + 1]`.
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self.alive.end -= 1;
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// Read the element from the array.
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// SAFETY: This is safe: `alive.end` is an
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// index into the "alive" region of the array. Compare the previous
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// comment that states that the alive region is
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// `data[alive.start..alive.end + 1]`. Reading this element means that
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// `data[alive.end]` is regarded as dead now (i.e. do not touch). As
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// `alive.end` was the end of the alive-zone, the alive zone is now
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// `data[alive]` again, restoring all invariants.
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let out = unsafe { self.data.get_unchecked(self.alive.end).read() };
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Some(out)
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}
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}
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#[stable(feature = "array_value_iter_impls", since = "1.40.0")]
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impl<T, const N: usize> Drop for IntoIter<T, N> {
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fn drop(&mut self) {
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// SAFETY: This is safe: `as_mut_slice` returns exactly the sub-slice
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// of elements that have not been moved out yet and that remain
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// to be dropped.
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unsafe { ptr::drop_in_place(self.as_mut_slice()) }
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}
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}
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#[stable(feature = "array_value_iter_impls", since = "1.40.0")]
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impl<T, const N: usize> ExactSizeIterator for IntoIter<T, N> {
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fn len(&self) -> usize {
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// Will never underflow due to the invariant `alive.start <=
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// alive.end`.
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self.alive.end - self.alive.start
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}
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fn is_empty(&self) -> bool {
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self.alive.is_empty()
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}
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}
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#[stable(feature = "array_value_iter_impls", since = "1.40.0")]
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impl<T, const N: usize> FusedIterator for IntoIter<T, N> {}
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// The iterator indeed reports the correct length. The number of "alive"
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// elements (that will still be yielded) is the length of the range `alive`.
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// This range is decremented in length in either `next` or `next_back`. It is
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// always decremented by 1 in those methods, but only if `Some(_)` is returned.
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#[stable(feature = "array_value_iter_impls", since = "1.40.0")]
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unsafe impl<T, const N: usize> TrustedLen for IntoIter<T, N> {}
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#[stable(feature = "array_value_iter_impls", since = "1.40.0")]
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impl<T: Clone, const N: usize> Clone for IntoIter<T, N> {
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fn clone(&self) -> Self {
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// SAFETY: each point of unsafety is documented inside the unsafe block
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unsafe {
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// This creates a new uninitialized array. Note that the `assume_init`
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// refers to the array, not the individual elements. And it is Ok if
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// the array is in an uninitialized state as all elements may be
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// uninitialized (all bit patterns are valid). Compare the
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// `MaybeUninit` docs for more information.
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let mut new_data: [MaybeUninit<T>; N] = MaybeUninit::uninit().assume_init();
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// Clone all alive elements.
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for idx in self.alive.clone() {
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// The element at `idx` in the old array is alive, so we can
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// safely call `get_ref()`. We then clone it, and write the
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// clone into the new array.
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let clone = self.data.get_unchecked(idx).get_ref().clone();
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new_data.get_unchecked_mut(idx).write(clone);
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}
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Self { data: new_data, alive: self.alive.clone() }
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}
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}
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}
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#[stable(feature = "array_value_iter_impls", since = "1.40.0")]
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impl<T: fmt::Debug, const N: usize> fmt::Debug for IntoIter<T, N> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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// Only print the elements that were not yielded yet: we cannot
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// access the yielded elements anymore.
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f.debug_tuple("IntoIter").field(&self.as_slice()).finish()
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}
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}
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366
library/core/src/array/mod.rs
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366
library/core/src/array/mod.rs
Normal file
@@ -0,0 +1,366 @@
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//! Implementations of things like `Eq` for fixed-length arrays
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//! up to a certain length. Eventually, we should be able to generalize
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//! to all lengths.
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//!
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//! *[See also the array primitive type](../../std/primitive.array.html).*
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#![stable(feature = "core_array", since = "1.36.0")]
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use crate::borrow::{Borrow, BorrowMut};
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use crate::cmp::Ordering;
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use crate::convert::{Infallible, TryFrom};
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use crate::fmt;
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use crate::hash::{self, Hash};
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use crate::marker::Unsize;
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use crate::slice::{Iter, IterMut};
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mod iter;
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#[unstable(feature = "array_value_iter", issue = "65798")]
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pub use iter::IntoIter;
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/// Utility trait implemented only on arrays of fixed size
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///
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/// This trait can be used to implement other traits on fixed-size arrays
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/// without causing much metadata bloat.
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///
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/// The trait is marked unsafe in order to restrict implementors to fixed-size
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/// arrays. User of this trait can assume that implementors have the exact
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/// layout in memory of a fixed size array (for example, for unsafe
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/// initialization).
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///
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/// Note that the traits [`AsRef`] and [`AsMut`] provide similar methods for types that
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/// may not be fixed-size arrays. Implementors should prefer those traits
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/// instead.
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///
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/// [`AsRef`]: ../convert/trait.AsRef.html
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/// [`AsMut`]: ../convert/trait.AsMut.html
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#[unstable(feature = "fixed_size_array", issue = "27778")]
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pub unsafe trait FixedSizeArray<T> {
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/// Converts the array to immutable slice
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#[unstable(feature = "fixed_size_array", issue = "27778")]
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fn as_slice(&self) -> &[T];
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/// Converts the array to mutable slice
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#[unstable(feature = "fixed_size_array", issue = "27778")]
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fn as_mut_slice(&mut self) -> &mut [T];
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}
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#[unstable(feature = "fixed_size_array", issue = "27778")]
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unsafe impl<T, A: Unsize<[T]>> FixedSizeArray<T> for A {
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#[inline]
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fn as_slice(&self) -> &[T] {
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self
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}
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#[inline]
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fn as_mut_slice(&mut self) -> &mut [T] {
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self
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}
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}
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/// The error type returned when a conversion from a slice to an array fails.
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#[stable(feature = "try_from", since = "1.34.0")]
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#[derive(Debug, Copy, Clone)]
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pub struct TryFromSliceError(());
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#[stable(feature = "core_array", since = "1.36.0")]
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impl fmt::Display for TryFromSliceError {
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#[inline]
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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fmt::Display::fmt(self.__description(), f)
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}
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}
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impl TryFromSliceError {
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#[unstable(
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feature = "array_error_internals",
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reason = "available through Error trait and this method should not \
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be exposed publicly",
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issue = "none"
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)]
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#[inline]
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#[doc(hidden)]
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pub fn __description(&self) -> &str {
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"could not convert slice to array"
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}
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}
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#[stable(feature = "try_from_slice_error", since = "1.36.0")]
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impl From<Infallible> for TryFromSliceError {
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fn from(x: Infallible) -> TryFromSliceError {
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match x {}
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}
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl<T, const N: usize> AsRef<[T]> for [T; N] {
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#[inline]
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fn as_ref(&self) -> &[T] {
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&self[..]
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}
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl<T, const N: usize> AsMut<[T]> for [T; N] {
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#[inline]
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fn as_mut(&mut self) -> &mut [T] {
|
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&mut self[..]
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}
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}
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#[stable(feature = "array_borrow", since = "1.4.0")]
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impl<T, const N: usize> Borrow<[T]> for [T; N] {
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fn borrow(&self) -> &[T] {
|
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self
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||||
}
|
||||
}
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||||
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#[stable(feature = "array_borrow", since = "1.4.0")]
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impl<T, const N: usize> BorrowMut<[T]> for [T; N] {
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fn borrow_mut(&mut self) -> &mut [T] {
|
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self
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}
|
||||
}
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#[stable(feature = "try_from", since = "1.34.0")]
|
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impl<T, const N: usize> TryFrom<&[T]> for [T; N]
|
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where
|
||||
T: Copy,
|
||||
{
|
||||
type Error = TryFromSliceError;
|
||||
|
||||
fn try_from(slice: &[T]) -> Result<[T; N], TryFromSliceError> {
|
||||
<&Self>::try_from(slice).map(|r| *r)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "try_from", since = "1.34.0")]
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||||
impl<'a, T, const N: usize> TryFrom<&'a [T]> for &'a [T; N] {
|
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type Error = TryFromSliceError;
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||||
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||||
fn try_from(slice: &[T]) -> Result<&[T; N], TryFromSliceError> {
|
||||
if slice.len() == N {
|
||||
let ptr = slice.as_ptr() as *const [T; N];
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||||
// SAFETY: ok because we just checked that the length fits
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unsafe { Ok(&*ptr) }
|
||||
} else {
|
||||
Err(TryFromSliceError(()))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "try_from", since = "1.34.0")]
|
||||
impl<'a, T, const N: usize> TryFrom<&'a mut [T]> for &'a mut [T; N] {
|
||||
type Error = TryFromSliceError;
|
||||
|
||||
fn try_from(slice: &mut [T]) -> Result<&mut [T; N], TryFromSliceError> {
|
||||
if slice.len() == N {
|
||||
let ptr = slice.as_mut_ptr() as *mut [T; N];
|
||||
// SAFETY: ok because we just checked that the length fits
|
||||
unsafe { Ok(&mut *ptr) }
|
||||
} else {
|
||||
Err(TryFromSliceError(()))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: Hash, const N: usize> Hash for [T; N] {
|
||||
fn hash<H: hash::Hasher>(&self, state: &mut H) {
|
||||
Hash::hash(&self[..], state)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: fmt::Debug, const N: usize> fmt::Debug for [T; N] {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
fmt::Debug::fmt(&&self[..], f)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, T, const N: usize> IntoIterator for &'a [T; N] {
|
||||
type Item = &'a T;
|
||||
type IntoIter = Iter<'a, T>;
|
||||
|
||||
fn into_iter(self) -> Iter<'a, T> {
|
||||
self.iter()
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'a, T, const N: usize> IntoIterator for &'a mut [T; N] {
|
||||
type Item = &'a mut T;
|
||||
type IntoIter = IterMut<'a, T>;
|
||||
|
||||
fn into_iter(self) -> IterMut<'a, T> {
|
||||
self.iter_mut()
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<A, B, const N: usize> PartialEq<[B; N]> for [A; N]
|
||||
where
|
||||
A: PartialEq<B>,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[B; N]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[B; N]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<A, B, const N: usize> PartialEq<[B]> for [A; N]
|
||||
where
|
||||
A: PartialEq<B>,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[B]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[B]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<A, B, const N: usize> PartialEq<[A; N]> for [B]
|
||||
where
|
||||
B: PartialEq<A>,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[A; N]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[A; N]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'b, A, B, const N: usize> PartialEq<&'b [B]> for [A; N]
|
||||
where
|
||||
A: PartialEq<B>,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &&'b [B]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &&'b [B]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'b, A, B, const N: usize> PartialEq<[A; N]> for &'b [B]
|
||||
where
|
||||
B: PartialEq<A>,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[A; N]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[A; N]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'b, A, B, const N: usize> PartialEq<&'b mut [B]> for [A; N]
|
||||
where
|
||||
A: PartialEq<B>,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &&'b mut [B]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &&'b mut [B]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<'b, A, B, const N: usize> PartialEq<[A; N]> for &'b mut [B]
|
||||
where
|
||||
B: PartialEq<A>,
|
||||
{
|
||||
#[inline]
|
||||
fn eq(&self, other: &[A; N]) -> bool {
|
||||
self[..] == other[..]
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &[A; N]) -> bool {
|
||||
self[..] != other[..]
|
||||
}
|
||||
}
|
||||
|
||||
// NOTE: some less important impls are omitted to reduce code bloat
|
||||
// __impl_slice_eq2! { [A; $N], &'b [B; $N] }
|
||||
// __impl_slice_eq2! { [A; $N], &'b mut [B; $N] }
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: Eq, const N: usize> Eq for [T; N] {}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: PartialOrd, const N: usize> PartialOrd for [T; N] {
|
||||
#[inline]
|
||||
fn partial_cmp(&self, other: &[T; N]) -> Option<Ordering> {
|
||||
PartialOrd::partial_cmp(&&self[..], &&other[..])
|
||||
}
|
||||
#[inline]
|
||||
fn lt(&self, other: &[T; N]) -> bool {
|
||||
PartialOrd::lt(&&self[..], &&other[..])
|
||||
}
|
||||
#[inline]
|
||||
fn le(&self, other: &[T; N]) -> bool {
|
||||
PartialOrd::le(&&self[..], &&other[..])
|
||||
}
|
||||
#[inline]
|
||||
fn ge(&self, other: &[T; N]) -> bool {
|
||||
PartialOrd::ge(&&self[..], &&other[..])
|
||||
}
|
||||
#[inline]
|
||||
fn gt(&self, other: &[T; N]) -> bool {
|
||||
PartialOrd::gt(&&self[..], &&other[..])
|
||||
}
|
||||
}
|
||||
|
||||
/// Implements comparison of arrays lexicographically.
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
impl<T: Ord, const N: usize> Ord for [T; N] {
|
||||
#[inline]
|
||||
fn cmp(&self, other: &[T; N]) -> Ordering {
|
||||
Ord::cmp(&&self[..], &&other[..])
|
||||
}
|
||||
}
|
||||
|
||||
// The Default impls cannot be generated using the array_impls! macro because
|
||||
// they require array literals.
|
||||
|
||||
macro_rules! array_impl_default {
|
||||
{$n:expr, $t:ident $($ts:ident)*} => {
|
||||
#[stable(since = "1.4.0", feature = "array_default")]
|
||||
impl<T> Default for [T; $n] where T: Default {
|
||||
fn default() -> [T; $n] {
|
||||
[$t::default(), $($ts::default()),*]
|
||||
}
|
||||
}
|
||||
array_impl_default!{($n - 1), $($ts)*}
|
||||
};
|
||||
{$n:expr,} => {
|
||||
#[stable(since = "1.4.0", feature = "array_default")]
|
||||
impl<T> Default for [T; $n] {
|
||||
fn default() -> [T; $n] { [] }
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
array_impl_default! {32, T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T}
|
||||
Reference in New Issue
Block a user