From 14e51127cf2ba4fdb3469da90fd2f8f26084bb4b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B8rgen=20Lind?= <jorgen.lind@digia.com>
Date: Thu, 23 Oct 2014 13:58:08 +0200
Subject: Add qobject_cast template specialisation for QWindow

greatly improving the performance of qobject_cast<QWindow *>

Change-Id: If5a1afa6e41f4676f4838ea3ff80f1d89e396dfc
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
---
 src/gui/kernel/qwindow.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/gui/kernel/qwindow.h')

diff --git a/src/gui/kernel/qwindow.h b/src/gui/kernel/qwindow.h
index 7cd25b010f..473d275b56 100644
--- a/src/gui/kernel/qwindow.h
+++ b/src/gui/kernel/qwindow.h
@@ -356,6 +356,19 @@ private:
     friend Q_GUI_EXPORT QWindowPrivate *qt_window_private(QWindow *window);
 };
 
+#ifndef Q_QDOC
+template <> inline QWindow *qobject_cast<QWindow*>(QObject *o)
+{
+    if (!o || !o->isWindowType()) return 0;
+    return static_cast<QWindow*>(o);
+}
+template <> inline const QWindow *qobject_cast<const QWindow*>(const QObject *o)
+{
+    if (!o || !o->isWindowType()) return 0;
+    return static_cast<const QWindow*>(o);
+}
+#endif // !Q_QDOC
+
 QT_END_NAMESPACE
 
 #endif // QWINDOW_H
-- 
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