1 files changed, 20 insertions, 1 deletions
diff --git a/src/corelib/tools/qarraydataops.h b/src/corelib/tools/qarraydataops.h
index bd8ead0a80..c3e9821e81 100644
--- a/src/corelib/tools/qarraydataops.h
+++ b/src/corelib/tools/qarraydataops.h
@@ -7,6 +7,7 @@
 
 #include <QtCore/qarraydata.h>
 #include <QtCore/qcontainertools_impl.h>
+#include <QtCore/qnamespace.h>
 
 #include <memory>
 #include <new>
@@ -236,7 +237,7 @@ public:
             if (it == end)
                 return result;
 
-            QPodArrayOps<T> other{ Data::allocate(this->size), this->size };
+            QPodArrayOps<T> other(this->size);
             Q_CHECK_PTR(other.data());
             auto dest = other.begin();
             // std::uninitialized_copy will fallback to ::memcpy/memmove()
@@ -960,6 +961,24 @@ public:
         // b might be updated so use [b, n)
         this->copyAppend(b, b + n);
     }
+
+    void appendUninitialized(qsizetype newSize)
+    {
+        Q_ASSERT(this->isMutable());
+        Q_ASSERT(!this->isShared());
+        Q_ASSERT(newSize > this->size);
+        Q_ASSERT(newSize - this->size <= this->freeSpaceAtEnd());
+
+        T *const b = this->begin();
+        do {
+            auto ptr = b + this->size;
+
+            if constexpr (std::is_constructible_v<T, Qt::Initialization>)
+                new (ptr) T(Qt::Uninitialized);
+            else
+                new (ptr) T; // not T() -- default-construct
+        } while (++this->size != newSize);
+    }
 };
 
 } // namespace QtPrivate