Output registered enums in qDebug operator for QFlags.

Change-Id: Ia424df234fbd333782c10f0a4422875bb1bfc1f5
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

2 files changed, 28 insertions, 2 deletions

diff --git a/src/corelib/io/qdebug.cpp b/src/corelib/io/qdebug.cpp
index f55f68f9b3..357d63137c 100644
--- a/src/corelib/io/qdebug.cpp
+++ b/src/corelib/io/qdebug.cpp
@@ -661,6 +661,20 @@ QDebug qt_QMetaEnum_debugOperator(QDebug &dbg, int value, const QMetaObject *met
     dbg << ')';
     return dbg;
 }
-#endif
+
+QDebug qt_QMetaEnum_flagDebugOperator(QDebug &debug, quint64 value, const QMetaObject *meta, const char *name)
+{
+    QDebugStateSaver saver(debug);
+    debug.resetFormat();
+    debug.noquote();
+    debug.nospace();
+    debug << "QFlags<";
+    const QMetaEnum me = meta->enumerator(meta->indexOfEnumerator(name));
+    if (const char *scope = me.scope())
+        debug << scope << "::";
+    debug << me.name() << ">(" << me.valueToKeys(value) << ')';
+    return debug;
+}
+#endif // !QT_NO_QOBJECT
 
 QT_END_NAMESPACE
diff --git a/src/corelib/io/qdebug.h b/src/corelib/io/qdebug.h
index 435e7450c7..7f1cb82f3a 100644
--- a/src/corelib/io/qdebug.h
+++ b/src/corelib/io/qdebug.h
@@ -263,6 +263,7 @@ inline QDebug operator<<(QDebug debug, const QContiguousCache<T> &cache)
 
 #ifndef QT_NO_QOBJECT
 Q_CORE_EXPORT QDebug qt_QMetaEnum_debugOperator(QDebug&, int value, const QMetaObject *meta, const char *name);
+Q_CORE_EXPORT QDebug qt_QMetaEnum_flagDebugOperator(QDebug &dbg, quint64 value, const QMetaObject *meta, const char *name);
 
 template<typename T>
 typename QtPrivate::QEnableIf<QtPrivate::IsQEnumHelper<T>::Value, QDebug>::Type
@@ -272,10 +273,21 @@ operator<<(QDebug dbg, T value)
     const char *name = qt_getEnumName(value);
     return qt_QMetaEnum_debugOperator(dbg, typename QFlags<T>::Int(value), obj, name);
 }
-#endif
 
 template <class T>
+inline typename QtPrivate::QEnableIf<QtPrivate::IsQEnumHelper<T>::Value, QDebug>::Type operator<<(QDebug debug, const QFlags<T> &flags)
+{
+    const QMetaObject *obj = qt_getEnumMetaObject(T());
+    const char *name = qt_getEnumName(T());
+    return qt_QMetaEnum_flagDebugOperator(debug, quint64(flags), obj, name);
+}
+
+template <class T>
+inline typename QtPrivate::QEnableIf<!QtPrivate::IsQEnumHelper<T>::Value, QDebug>::Type operator<<(QDebug debug, const QFlags<T> &flags)
+#else // !QT_NO_QOBJECT
+template <class T>
 inline QDebug operator<<(QDebug debug, const QFlags<T> &flags)
+#endif
 {
     QDebugStateSaver saver(debug);
     debug.resetFormat();