Add serializer/deserializer for Enumeration

Enum class are serialized using the declared size.

[ChangeLog][QtCore][QDataStream] Enumerations can now
be serialized through QDataStream without the need of
manually defining streaming operators.

Change-Id: Iae9a63eb62b5a5615b657766a3c4c66ba4d98d0e
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Reviewed-by: Paolo Dastoli <paolo.dastoli@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/corelib/serialization/qdatastream.h b/src/corelib/serialization/qdatastream.h
index 6e358df02e..2acf7d8c4b 100644
--- a/src/corelib/serialization/qdatastream.h
+++ b/src/corelib/serialization/qdatastream.h
@@ -378,6 +378,16 @@ inline QDataStream &operator>>(QDataStream &s, QFlags<Enum> &e)
 { return s >> e.i; }
 
 template <typename T>
+typename std::enable_if<std::is_enum<T>::value, QDataStream &>::type&
+operator<<(QDataStream &s, const T &t)
+{ return s << static_cast<typename std::underlying_type<T>::type>(t); }
+
+template <typename T>
+typename std::enable_if<std::is_enum<T>::value, QDataStream &>::type&
+operator>>(QDataStream &s, T &t)
+{ return s >> reinterpret_cast<typename std::underlying_type<T>::type &>(t); }
+
+template <typename T>
 inline QDataStream &operator>>(QDataStream &s, QList<T> &l)
 {
     return QtPrivate::readArrayBasedContainer(s, l);