From 3378001b9bff52120725234afe2e625798871625 Mon Sep 17 00:00:00 2001
From: nogitsune-youkai <nikita.elin2011@yandex.ru>
Date: Mon, 28 Sep 2026 22:02:08 +0300
Subject: [PATCH] Fix: Add asserts to prevent undefined behavior on empty
 containers

---
 src/util/stack_vector.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/util/stack_vector.hpp b/src/util/stack_vector.hpp
index 87749396b..3c506f160 100644
--- a/src/util/stack_vector.hpp
+++ b/src/util/stack_vector.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cassert>
 #include <cstddef>
 #include <initializer_list>
 #include <stdexcept>
@@ -74,6 +75,7 @@ namespace util {
         }
 
         void pop_back() noexcept {
+            assert(!empty() && "pop_back() called on empty stack_vector");
             if (size_ > 0) {
                 data_.ptr()[size_ - 1].~T();
                 --size_;
@@ -110,18 +112,22 @@ namespace util {
         }
 
         T& front() {
+            assert(!empty() && "front() called on empty stack_vector");
             return data_.ptr()[0];
         }
 
         T& back() {
+            assert(!empty() && "back() called on empty stack_vector");
             return data_.ptr()[size_ - 1];
         }
 
         const T& front() const {
+            assert(!empty() && "front() called on empty stack_vector");
             return data_.ptr()[0];
         }
 
         const T& back() const {
+            assert(!empty() && "back() called on empty stack_vector");
             return data_.ptr()[size_ - 1];
         }