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  1. Qt
  2. QTBUG-86424

Can not use enum (class) as slot argument with underlying type (unsigned) long, e.g. std::uint64_t

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    • 0c010cd9c (dev)

      I've been using Qt 6 commit 174154bcac2780cb704011662f2e9c1233fec933 (from Fri Aug 21 13:01:43). Maybe the problem stated in the summary has already been fixed.

      The compile error looks like this:

      /usr/include/qt6/QtCore/qdatastream.h:421:12: error: use of overloaded operator '<<' is ambiguous (with operand types 'QDataStream' and 'typename std::underlying_type<EnumClassUsingUnsignedLong>::type' (aka 'long'))
{ return s << static_cast<typename std::underlying_type<T>::type>(t); }
 ~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/qt6/QtCore/qmetatype.h:2435:10: note: in instantiation of function template specialization 'operator<<<QtGui::EnumClassUsingUnsignedLong>' requested here
 \{ ds << *reinterpret_cast<const T *>(a); }
 ^
/usr/include/qt6/QtCore/qmetatype.h:2534:56: note: in instantiation of member function 'QtPrivate::QDataStreamOperatorForType<QtGui::EnumClassUsingUnsignedLong, true>::dataStreamOut' requested here
 /*.dataStreamOut=*/ QDataStreamOperatorForType<T>::dataStreamOut,
 ^
/usr/include/qt6/QtCore/qmetatype.h:2645:39: note: in instantiation of static data member 'QtPrivate::QMetaTypeForType<QtGui::EnumClassUsingUnsignedLong>::metaType' requested here
 return &QMetaTypeForType<Ty>::metaType;

      Code snipped to reproduce the compile error:

      enum EnumClassUsingUnsignedLong : long {
    Foo,
    Bar,
};

class Test : public QObject {
    Q_OBJECT

public Q_SLOTS:
    void foo(EnumClassUsingUnsignedLong bar);
};

      It also doesn't work with unsigned long and when using enum class.

      Likely it is just missing an overload for long and unsigned long.
       

       

       

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            thiago Thiago Macieira
            martchus martchus
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              Created:
              Updated:
              Resolved:

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