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Make [].as_[mut_]ptr_range() (unstably) const. #77097

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Merged
merged 1 commit into from
Sep 25, 2020
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Make [].as_[mut_]ptr_range() (unstably) const. #77097

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9 changes: 6 additions & 3 deletions library/core/src/slice/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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
}

Expand Down Expand Up @@ -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:
//
Expand Down Expand Up @@ -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()) };
Expand Down