diff options
| -rw-r--r-- | library/alloc/src/collections/vec_deque/mod.rs | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/library/alloc/src/collections/vec_deque/mod.rs b/library/alloc/src/collections/vec_deque/mod.rs index de607c8fdab..00862615c3c 100644 --- a/library/alloc/src/collections/vec_deque/mod.rs +++ b/library/alloc/src/collections/vec_deque/mod.rs @@ -2179,19 +2179,21 @@ impl<T, A: Allocator> VecDeque<T, A> { } } + // Double the buffer size. This method is inline(never), so we expect it to only + // be called in cold paths. // This may panic or abort #[inline(never)] fn grow(&mut self) { - if self.is_full() { - let old_cap = self.cap(); - // Double the buffer size. - self.buf.reserve_exact(old_cap, old_cap); - assert!(self.cap() == old_cap * 2); - unsafe { - self.handle_capacity_increase(old_cap); - } - debug_assert!(!self.is_full()); + // Extend or possibly remove this assertion when valid use-cases for growing the + // buffer without it being full emerge + debug_assert!(self.is_full()); + let old_cap = self.cap(); + self.buf.reserve_exact(old_cap, old_cap); + assert!(self.cap() == old_cap * 2); + unsafe { + self.handle_capacity_increase(old_cap); } + debug_assert!(!self.is_full()); } /// Modifies the `VecDeque` in-place so that `len()` is equal to `new_len`, |