1 files changed, 5 insertions, 4 deletions
diff --git a/src/corelib/io/qdebug.h b/src/corelib/io/qdebug.h
index 889fb6b571..421c5d933b 100644
--- a/src/corelib/io/qdebug.h
+++ b/src/corelib/io/qdebug.h
@@ -65,6 +65,7 @@ QT_BEGIN_NAMESPACE
 class Q_CORE_EXPORT QDebug
 {
     friend class QMessageLogger;
+    friend class QDebugStateSaver;
     friend class QDebugStateSaverPrivate;
     struct Stream {
         enum { VerbosityShift = 29, VerbosityMask = 0x7 };
@@ -114,7 +115,10 @@ public:
     inline QDebug(QString *string) : stream(new Stream(string)) {}
     inline QDebug(QtMsgType t) : stream(new Stream(t)) {}
     inline QDebug(const QDebug &o):stream(o.stream) { ++stream->ref; }
+    QDebug(QDebug &&other) noexcept : stream{qExchange(other.stream, nullptr)} {}
     inline QDebug &operator=(const QDebug &other);
+    QDebug &operator=(QDebug &&other) noexcept
+    { QDebug{std::move(other)}.swap(*this); return *this; }
     ~QDebug();
     inline void swap(QDebug &other) noexcept { qSwap(stream, other.stream); }
 
@@ -203,10 +207,7 @@ public:
 
 inline QDebug &QDebug::operator=(const QDebug &other)
 {
-    if (this != &other) {
-        QDebug copy(other);
-        qSwap(stream, copy.stream);
-    }
+    QDebug{other}.swap(*this);
     return *this;
 }