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Rollup merge of #120291 - pitaj:string-sliceindex, r=Amanieu

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Have `String` use `SliceIndex` impls from `str`

This PR simplifies the implementation of `Index` and `IndexMut` on `String`, and in the process enables indexing `String` by any user types that implement `SliceIndex<str>`.

Similar to #47832

r? libs

Not sure if this warrants a crater run.
This commit is contained in:
Jacob Pratt 2024-02-29 05:25:26 -05:00 committed by GitHub
commit 6d865038a5
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2 changed files with 16 additions and 89 deletions
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1
library/alloc/src/lib.rs
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@ -152,6 +152,7 @@
#![feature(set_ptr_value)]
#![feature(sized_type_properties)]
#![feature(slice_from_ptr_range)]
#![feature(slice_index_methods)]
#![feature(slice_ptr_get)]
#![feature(slice_ptr_len)]
#![feature(slice_range)]

104
library/alloc/src/string.rs
View File

@ -54,7 +54,7 @@ use core::ops::Add;
use core::ops::AddAssign;
#[cfg(not(no_global_oom_handling))]
use core::ops::Bound::{Excluded, Included, Unbounded};
use core::ops::{self, Index, IndexMut, Range, RangeBounds};
use core::ops::{self, Range, RangeBounds};
use core::ptr;
use core::slice;
use core::str::pattern::Pattern;
@ -2433,100 +2433,26 @@ impl AddAssign<&str> for String {
}
#[stable(feature = "rust1", since = "1.0.0")]
impl ops::Index<ops::Range<usize>> for String {
type Output = str;
impl<I> ops::Index<I> for String
where
I: slice::SliceIndex<str>,
{
type Output = I::Output;
#[inline]
fn index(&self, index: ops::Range<usize>) -> &str {
&self[..][index]
fn index(&self, index: I) -> &I::Output {
index.index(self.as_str())
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl ops::Index<ops::RangeTo<usize>> for String {
type Output = str;
impl<I> ops::IndexMut<I> for String
where
I: slice::SliceIndex<str>,
{
#[inline]
fn index(&self, index: ops::RangeTo<usize>) -> &str {
&self[..][index]
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl ops::Index<ops::RangeFrom<usize>> for String {
type Output = str;
#[inline]
fn index(&self, index: ops::RangeFrom<usize>) -> &str {
&self[..][index]
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl ops::Index<ops::RangeFull> for String {
type Output = str;
#[inline]
fn index(&self, _index: ops::RangeFull) -> &str {
unsafe { str::from_utf8_unchecked(&self.vec) }
}
}
#[stable(feature = "inclusive_range", since = "1.26.0")]
impl ops::Index<ops::RangeInclusive<usize>> for String {
type Output = str;
#[inline]
fn index(&self, index: ops::RangeInclusive<usize>) -> &str {
Index::index(&**self, index)
}
}
#[stable(feature = "inclusive_range", since = "1.26.0")]
impl ops::Index<ops::RangeToInclusive<usize>> for String {
type Output = str;
#[inline]
fn index(&self, index: ops::RangeToInclusive<usize>) -> &str {
Index::index(&**self, index)
}
}
#[stable(feature = "derefmut_for_string", since = "1.3.0")]
impl ops::IndexMut<ops::Range<usize>> for String {
#[inline]
fn index_mut(&mut self, index: ops::Range<usize>) -> &mut str {
&mut self[..][index]
}
}
#[stable(feature = "derefmut_for_string", since = "1.3.0")]
impl ops::IndexMut<ops::RangeTo<usize>> for String {
#[inline]
fn index_mut(&mut self, index: ops::RangeTo<usize>) -> &mut str {
&mut self[..][index]
}
}
#[stable(feature = "derefmut_for_string", since = "1.3.0")]
impl ops::IndexMut<ops::RangeFrom<usize>> for String {
#[inline]
fn index_mut(&mut self, index: ops::RangeFrom<usize>) -> &mut str {
&mut self[..][index]
}
}
#[stable(feature = "derefmut_for_string", since = "1.3.0")]
impl ops::IndexMut<ops::RangeFull> for String {
#[inline]
fn index_mut(&mut self, _index: ops::RangeFull) -> &mut str {
unsafe { str::from_utf8_unchecked_mut(&mut *self.vec) }
}
}
#[stable(feature = "inclusive_range", since = "1.26.0")]
impl ops::IndexMut<ops::RangeInclusive<usize>> for String {
#[inline]
fn index_mut(&mut self, index: ops::RangeInclusive<usize>) -> &mut str {
IndexMut::index_mut(&mut **self, index)
}
}
#[stable(feature = "inclusive_range", since = "1.26.0")]
impl ops::IndexMut<ops::RangeToInclusive<usize>> for String {
#[inline]
fn index_mut(&mut self, index: ops::RangeToInclusive<usize>) -> &mut str {
IndexMut::index_mut(&mut **self, index)
fn index_mut(&mut self, index: I) -> &mut I::Output {
index.index_mut(self.as_mut_str())
}
}