From bb7a6bd989b748a29c1a1e68807da2dd3176186a Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 23 Mar 2026 11:19:30 +0100
Subject: kstd: fix push/emplace_back bug in vector

---
 libs/kstd/include/kstd/vector | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'libs/kstd/include')

diff --git a/libs/kstd/include/kstd/vector b/libs/kstd/include/kstd/vector
index b2cce0b..1242489 100644
--- a/libs/kstd/include/kstd/vector
+++ b/libs/kstd/include/kstd/vector
@@ -594,12 +594,14 @@ namespace kstd
       {
         auto new_capacity = m_capacity == 0 ? 1 : m_capacity * 2;
         auto new_data = allocate_n(new_capacity);
+        auto old_size = size();
         std::allocator_traits<allocator_type>::construct(m_allocator, new_data + m_size, value);
         uninitialized_move_with_allocator(begin(), new_data, size());
         destroy_n(begin(), size());
         deallocate();
         m_data = new_data;
         m_capacity = new_capacity;
+        m_size = old_size;
       }
       else
       {
@@ -615,12 +617,14 @@ namespace kstd
       {
         auto new_capacity = m_capacity == 0 ? 1 : m_capacity * 2;
         auto new_data = allocate_n(new_capacity);
+        auto old_size = size();
         std::allocator_traits<allocator_type>::construct(m_allocator, new_data + m_size, std::move(value));
         uninitialized_move_with_allocator(begin(), new_data, size());
         destroy_n(begin(), size());
         deallocate();
         m_data = new_data;
         m_capacity = new_capacity;
+        m_size = old_size;
       }
       else
       {
@@ -637,12 +641,14 @@ namespace kstd
       {
         auto new_capacity = m_capacity == 0 ? 1 : m_capacity * 2;
         auto new_data = allocate_n(new_capacity);
+        auto old_size = size();
         std::allocator_traits<allocator_type>::construct(m_allocator, new_data + m_size, std::forward<Args>(args)...);
         uninitialized_move_with_allocator(begin(), new_data, size());
         destroy_n(begin(), size());
         deallocate();
         m_data = new_data;
         m_capacity = new_capacity;
+        m_size = old_size;
       }
       else
       {
-- 
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