From 507be11303c8dd9709d903f8e5ec197be66209ce Mon Sep 17 00:00:00 2001
From: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Date: Wed, 13 Oct 2021 01:34:26 +0200
Subject: [PATCH] QArrayDataOps: improve appendIteratorRange
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Handle contiguous iterators in there directly.

Change-Id: I3b6d45f993f82d0de5edbfcd75856f43a7f1263b
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
---
 src/corelib/tools/qarraydataops.h | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/src/corelib/tools/qarraydataops.h b/src/corelib/tools/qarraydataops.h
index 9a2f43cbb1..173e3cac2e 100644
--- a/src/corelib/tools/qarraydataops.h
+++ b/src/corelib/tools/qarraydataops.h
@@ -911,10 +911,20 @@ public:
         Q_ASSERT(distance >= 0 && distance <= this->allocatedCapacity() - this->size);
         Q_UNUSED(distance);
 
-        T *iter = this->end();
-        for (; b != e; ++iter, ++b) {
-            new (iter) T(*b);
-            ++this->size;
+#if __cplusplus >= 202002L
+        if constexpr (
+            std::is_convertible_v<
+                    typename std::iterator_traits<It>::iterator_category,
+                    std::contiguous_iterator_tag>) {
+            this->copyAppend(std::to_address(b), std::to_address(e));
+        } else
+#endif
+        {
+            T *iter = this->end();
+            for (; b != e; ++iter, ++b) {
+                new (iter) T(*b);
+                ++this->size;
+            }
         }
     }