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Rollup merge of #77097 - fusion-engineering-forks:slice-ptr-range-const-fn, r=oli-obk 

Make [].as_[mut_]ptr_range() (unstably) const.

Gated behind `const_ptr_offset`, as suggested by https://github.com/rust-lang/rust/issues/65807#issuecomment-697229404

This also marks `[].as_mut_ptr()` as const, because it's used by `as_mut_ptr_range`. I gated it behind the same feature, because I figured it's not worth adding a separate tracking issue for const `as_mut_ptr`.
This commit is contained in:
Jonas Schievink 2020-09-25 19:42:39 +02:00 committed by GitHub
parent b49990cede 631c688350
commit 1149b308cd
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1 changed files with 6 additions and 3 deletions
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9
library/core/src/slice/mod.rs
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@ -433,8 +433,9 @@ impl<T> [T] {
/// assert_eq!(x, &[3, 4, 6]);
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn as_mut_ptr(&mut self) -> *mut T {
pub const fn as_mut_ptr(&mut self) -> *mut T {
self as *mut [T] as *mut T
}
@ -469,8 +470,9 @@ impl<T> [T] {
///
/// [`as_ptr`]: #method.as_ptr
#[unstable(feature = "slice_ptr_range", issue = "65807")]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn as_ptr_range(&self) -> Range<*const T> {
pub const fn as_ptr_range(&self) -> Range<*const T> {
let start = self.as_ptr();
// SAFETY: The `add` here is safe, because:
//
@ -510,8 +512,9 @@ impl<T> [T] {
///
/// [`as_mut_ptr`]: #method.as_mut_ptr
#[unstable(feature = "slice_ptr_range", issue = "65807")]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn as_mut_ptr_range(&mut self) -> Range<*mut T> {
pub const fn as_mut_ptr_range(&mut self) -> Range<*mut T> {
let start = self.as_mut_ptr();
// SAFETY: See as_ptr_range() above for why `add` here is safe.
let end = unsafe { start.add(self.len()) };