From c65819d3eb5ac202b768ae6dcbd36539646afb46 Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Thu, 15 Jan 2026 13:42:20 -0500
Subject: [PATCH] xo-arena: memory checks in DArenaVector::push_back()

---
 include/xo/arena/DArenaVector.hpp | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/include/xo/arena/DArenaVector.hpp b/include/xo/arena/DArenaVector.hpp
index a5834ea..f8bd982 100644
--- a/include/xo/arena/DArenaVector.hpp
+++ b/include/xo/arena/DArenaVector.hpp
@@ -296,25 +296,27 @@ namespace xo {
             size_type z = size_ + 1;
             size_type req_z = z * sizeof(T);
 
-            this->store_.expand(req_z);
+            if (this->store_.expand(req_z)) {
+                T * addr = this->_address_of(size_);
 
-            T * addr = this->_address_of(size_);
+                new (addr) T{std::move(x)};
 
-            new (addr) T{std::move(x)};
-
-            this->size_ = z;
+                this->size_ = z;
+            }
         }
 
         template <typename T>
         void
         DArenaVector<T>::push_back(const T & x) {
             size_type z = size_ + 1;
-            store_.expand(z * sizeof(T));
 
-            T * addr = this->_address_of(size_);
-            new (addr) T{x};
+            if (this->store_.expand(z * sizeof(T))) {
+                T * addr = this->_address_of(size_);
 
-            size_ = z;
+                new (addr) T{x};
+
+                this->size_ = z;
+            }
         }
 
         template <typename T>