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QObject: fix connection to function pointer with non-copyable references argument

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For example, QObject is non copyable (its copy constructor is deleted or
private via Q_DISABLE_COPY). It should still be allowed to pass a reference
to a QObject as an argument to as signal (or slot).
This fixes a compilation failure.

Task-number: QTBUG-36119
Change-Id: I9bcf477e347d69fdae2543c99781b6421883be78
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Olivier Goffart 2014-01-14 13:54:30 +01:00 committed by The Qt Project
parent 04b8af2739
commit e59b28e08e
2 changed files with 16 additions and 2 deletions
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4
src/corelib/kernel/qobjectdefs_impl.h
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@ -567,9 +567,9 @@ namespace QtPrivate {
Q_STATIC_ASSERT(CheckCompatibleArguments<FunctionPointer<Signal>::Arguments, FunctionPointer<Slot>::Arguments>::value)
*/
template<typename A1, typename A2> struct AreArgumentsCompatible {
static int test(A2);
static int test(const typename RemoveRef<A2>::Type&);
static char test(...);
static A1 dummy();
static const typename RemoveRef<A1>::Type &dummy();
enum { value = sizeof(test(dummy())) == sizeof(int) };
};
template<typename A1, typename A2> struct AreArgumentsCompatible<A1, A2&> { enum { value = false }; };

14
tests/auto/corelib/kernel/qobject/tst_qobject.cpp
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@ -4759,6 +4759,9 @@ class LotsOfSignalsAndSlots: public QObject
#endif*/
static void static_slot_vPFvvE(fptr) {}
void slot_vcRQObject(const QObject &) {}
void slot_vRQObject(QObject &) {}
signals:
void signal_v();
void signal_vi(int);
@ -4776,6 +4779,9 @@ class LotsOfSignalsAndSlots: public QObject
void const_signal_v() const;
void const_signal_vi(int) const;
void signal_vcRQObject(const QObject &);
void signal_vRQObject(QObject &);
void signal(short&, short, long long, short);
void otherSignal(const char *);
};
@ -4893,6 +4899,14 @@ void tst_QObject::connectCxx0xTypeMatching()
QVERIFY(QObject::connect(&obj, &Foo::const_signal_vi, &obj, &Foo::slot_vi));
QVERIFY(QObject::connect(&obj, &Foo::signal_vi, &obj, &Foo::const_slot_vi));
QVERIFY(QObject::connect(&obj, &Foo::signal_vi, &obj, &Foo::const_slot_v));
QVERIFY(QObject::connect(&obj, &Foo::signal_vcRQObject, &obj, &Foo::slot_vcRQObject));
QVERIFY(QObject::connect(&obj, &Foo::signal_vRQObject, &obj, &Foo::slot_vRQObject));
QVERIFY(QObject::connect(&obj, &Foo::signal_vRQObject, &obj, &Foo::slot_vcRQObject));
// QVERIFY(QObject::connect(&obj, &Foo::signal_vcRQObject, &obj, &Foo::slot_vRQObject)); // Should be an error (const& -> &)
QVERIFY(QObject::connect(&obj, &Foo::signal_vRi, &obj, &Foo::slot_vs));
}
class StringVariant : public QObject