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Fix metatype trait for types that are both QObject and Q_GADGET

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Fixes ambiguous template instantiation for types that derive from both
a QObject and Q_GADGET. For such types we treat them only as QObjects
as they extend the functionality of the gadget.

Task-number: QTBUG-68803
Change-Id: Ic42766034e14e5df43c4e6f7811e2c0be1dc7e74
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
This commit is contained in:
Daniel Vrátil 2018-06-30 13:53:03 +02:00
parent 0ac09c40f2
commit 35e005bc4f
2 changed files with 13 additions and 2 deletions
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4
src/corelib/kernel/qmetatype.h
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@ -1413,8 +1413,8 @@ namespace QtPrivate
static char checkType(void (X::*)());
static void *checkType(void (T::*)());
enum {
IsRealGadget = sizeof(checkType(&T::qt_check_for_QGADGET_macro)) == sizeof(void *),
IsGadgetOrDerivedFrom = true
IsRealGadget = !IsPointerToTypeDerivedFromQObject<T*>::Value && sizeof(checkType(&T::qt_check_for_QGADGET_macro)) == sizeof(void *),
IsGadgetOrDerivedFrom = !IsPointerToTypeDerivedFromQObject<T*>::Value
};
};

11
tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
View File

@ -1696,11 +1696,21 @@ public:
Q_ENUM(MyEnum)
};
class MyQObjectFromGadget : public QObject, public MyGadget
{
Q_OBJECT
public:
MyQObjectFromGadget(QObject *parent = 0)
: QObject(parent)
{}
};
Q_DECLARE_METATYPE(MyGadget);
Q_DECLARE_METATYPE(MyGadget*);
Q_DECLARE_METATYPE(const QMetaObject *);
Q_DECLARE_METATYPE(Qt::ScrollBarPolicy);
Q_DECLARE_METATYPE(MyGadget::MyEnum);
Q_DECLARE_METATYPE(MyQObjectFromGadget*);
void tst_QMetaType::metaObject_data()
{
@ -1719,6 +1729,7 @@ void tst_QMetaType::metaObject_data()
QTest::newRow("MyGadget*") << ::qMetaTypeId<MyGadget*>() << &MyGadget::staticMetaObject << false << true << false;
QTest::newRow("MyEnum") << ::qMetaTypeId<MyGadget::MyEnum>() << &MyGadget::staticMetaObject << false << false << false;
QTest::newRow("Qt::ScrollBarPolicy") << ::qMetaTypeId<Qt::ScrollBarPolicy>() << &QObject::staticQtMetaObject << false << false << false;
QTest::newRow("MyQObjectFromGadget*") << ::qMetaTypeId<MyQObjectFromGadget*>() << &MyQObjectFromGadget::staticMetaObject << false << false << true;
QTest::newRow("GadgetDerivedAndTyped<int>") << ::qMetaTypeId<GadgetDerivedAndTyped<int>>() << &GadgetDerivedAndTyped<int>::staticMetaObject << true << false << false;
QTest::newRow("GadgetDerivedAndTyped<int>*") << ::qMetaTypeId<GadgetDerivedAndTyped<int>*>() << &GadgetDerivedAndTyped<int>::staticMetaObject << false << true << false;