nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2025-02-25 05:14:27 +00:00
Code Issues Packages Projects Releases Wiki Activity

Added SAFETY comment as request

Browse Source
This commit is contained in:
Giacomo Stevanato 2020-11-09 22:34:31 +01:00
parent 8d1575365d
commit 387568cd56
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
library/alloc/src/collections/binary_heap.rs
View File

@ -495,6 +495,10 @@ impl<T: Ord> BinaryHeap<T> {
let mut end = self.len(); let mut end = self.len();
while end > 1 { while end > 1 {
end -= 1; end -= 1;
// SAFETY: `end` goes from `self.len() - 1` to 1 (both included),
// so it's always a valid index to access.
// It is safe to access index 0 (i.e. `ptr`), because
// 1 <= end < self.len(), which means self.len() >= 2.
unsafe { unsafe {
let ptr = self.data.as_mut_ptr(); let ptr = self.data.as_mut_ptr();
ptr::swap(ptr, ptr.add(end)); ptr::swap(ptr, ptr.add(end));