From d0222d66573d6316a22b9ffce205d1f6db8046bd Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@qt.io>
Date: Fri, 16 Apr 2021 08:48:52 +0200
Subject: PySide6: Call reserve() when converting lists

If a size can be obtained, add a call to reserve()
to avoid reallocations for large lists.

Task-number: PYSIDE-1540
Task-number: PYSIDE-1503
Change-Id: I95a8a6aa02641d9f174dbc3b63740a05d1d95a45
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Christian Tismer <tismer@stackless.com>
---
 sources/pyside6/PySide6/templates/core_common.xml | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'sources')

diff --git a/sources/pyside6/PySide6/templates/core_common.xml b/sources/pyside6/PySide6/templates/core_common.xml
index b173684ba..d3bedfc9f 100644
--- a/sources/pyside6/PySide6/templates/core_common.xml
+++ b/sources/pyside6/PySide6/templates/core_common.xml
@@ -296,6 +296,12 @@
 
     <template name="pyseq_to_cpplist_conversion">
     // PYSIDE-795: Turn all sequences into iterables.
+    if (PyList_Check(%in)) {
+        const Py_ssize_t size = PySequence_Size(%in);
+        if (size &gt; 10)
+            (%out).reserve(size);
+    }
+
     Shiboken::AutoDecRef it(PyObject_GetIter(%in));
     PyObject *(*iternext)(PyObject *) = *Py_TYPE(it)->tp_iternext;
     for (;;) {
-- 
cgit v1.2.3