Method reserve_slow

src/fast.rs:94–106

(me: &mut FastVec<T>, additional: usize)

            #[cold]
            #[inline(never)]
            fn reserve_slow<T>(me: &mut FastVec<T>, additional: usize) {
                // Safety: `Vec::reserve` panics on OOM without freeing Vec, so Vec is unmodified.
                unsafe {
                    me.mut_vec(|v| {
                        // Optimizes out a redundant check in `Vec::reserve`.
                        // Safety: we've already ensured this condition before calling reserve_slow.
                        if additional <= v.capacity().wrapping_sub(v.len()) {
                            std::hint::unreachable_unchecked();
                        }
                        v.reserve(additional);
                    });
                }
            }
            reserve_slow(self, additional);
        }
    }