From 2d9700c041b7d19f8204d96b2dc8b37859fbf4f5 Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@kdab.com>
Date: Sun, 17 Aug 2014 20:23:22 +0200
Subject: QPointer: add member-swap

Change-Id: I5704badc86f98e549c586656ec8df3915632ce15
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
---
 src/corelib/kernel/qpointer.cpp                     |  8 ++++++++
 src/corelib/kernel/qpointer.h                       |  2 ++
 tests/auto/corelib/kernel/qpointer/tst_qpointer.cpp | 17 +++++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/src/corelib/kernel/qpointer.cpp b/src/corelib/kernel/qpointer.cpp
index 2c872716d1..39cc17f7dd 100644
--- a/src/corelib/kernel/qpointer.cpp
+++ b/src/corelib/kernel/qpointer.cpp
@@ -127,6 +127,14 @@
     pointed to.
 */
 
+/*!
+    \fn void QPointer::swap(QPointer<T> &other)
+    \since 5.6
+
+    Swaps the contents of this QPointer with the contents of \a other.
+    This operation is very fast and never fails.
+*/
+
 /*!
     \fn QPointer<T> & QPointer::operator=(T* p)
 
diff --git a/src/corelib/kernel/qpointer.h b/src/corelib/kernel/qpointer.h
index 07649ce0b2..a3e922ccc9 100644
--- a/src/corelib/kernel/qpointer.h
+++ b/src/corelib/kernel/qpointer.h
@@ -66,6 +66,8 @@ public:
     // compiler-generated copy/move ctor/assignment operators are fine!
     inline ~QPointer() { }
 
+    inline void swap(QPointer &other) { wp.swap(other.wp); }
+
     inline QPointer<T> &operator=(T* p)
     { wp.assign(static_cast<QObjectType*>(p)); return *this; }
 
diff --git a/tests/auto/corelib/kernel/qpointer/tst_qpointer.cpp b/tests/auto/corelib/kernel/qpointer/tst_qpointer.cpp
index 814c4bb691..d7cce4ada4 100644
--- a/tests/auto/corelib/kernel/qpointer/tst_qpointer.cpp
+++ b/tests/auto/corelib/kernel/qpointer/tst_qpointer.cpp
@@ -50,6 +50,7 @@ private slots:
     void destructor();
     void assignment_operators();
     void equality_operators();
+    void swap();
     void isNull();
     void dereference_operators();
     void disconnect();
@@ -169,6 +170,22 @@ void tst_QPointer::equality_operators()
 #endif
 }
 
+void tst_QPointer::swap()
+{
+    QPointer<QObject> c1, c2;
+    {
+        QObject o;
+        c1 = &o;
+        QVERIFY(c2.isNull());
+        QCOMPARE(c1.data(), &o);
+        c1.swap(c2);
+        QVERIFY(c1.isNull());
+        QCOMPARE(c2.data(), &o);
+    }
+    QVERIFY(c1.isNull());
+    QVERIFY(c2.isNull());
+}
+
 void tst_QPointer::isNull()
 {
     QPointer<QObject> p1;
-- 
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