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** This file is part of the QtCore module of the Qt Toolkit.
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** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
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#ifndef Q_QDOC
#ifndef QOBJECT_H
#error Do not include qobject_impl.h directly
#endif
#if 0
#pragma qt_sync_skip_header_check
#pragma qt_sync_stop_processing
#endif
QT_BEGIN_NAMESPACE
namespace QtPrivate {
/*
Logic to statically generate the array of qMetaTypeId
ConnectionTypes<FunctionPointer<Signal>::Arguments>::types() returns an array
of int that is suitable for the types arguments of the connection functions.
The array only exist of all the types are declared as a metatype
(detected using the TypesAreDeclaredMetaType helper struct)
If one of the type is not declared, the function return 0 and the signal
cannot be used in queued connection.
*/
template <typename ArgList> struct TypesAreDeclaredMetaType { enum { Value = false }; };
template <> struct TypesAreDeclaredMetaType<List<>> { enum { Value = true }; };
template <typename Arg, typename... Tail> struct TypesAreDeclaredMetaType<List<Arg, Tail...> >
{ enum { Value = QMetaTypeId2<Arg>::Defined && TypesAreDeclaredMetaType<List<Tail...>>::Value }; };
template <typename ArgList, bool Declared = TypesAreDeclaredMetaType<ArgList>::Value > struct ConnectionTypes
{ static const int *types() { return Q_NULLPTR; } };
template <> struct ConnectionTypes<List<>, true>
{ static const int *types() { return Q_NULLPTR; } };
template <typename... Args> struct ConnectionTypes<List<Args...>, true>
{ static const int *types() { static const int t[sizeof...(Args) + 1] = { (QtPrivate::QMetaTypeIdHelper<Args>::qt_metatype_id())..., 0 }; return t; } };
// internal base class (interface) containing functions required to call a slot managed by a pointer to function.
class QSlotObjectBase {
QAtomicInt m_ref;
// don't use virtual functions here; we don't want the
// compiler to create tons of per-polymorphic-class stuff that
// we'll never need. We just use one function pointer.
typedef void (*ImplFn)(int which, QSlotObjectBase* this_, QObject *receiver, void **args, bool *ret);
const ImplFn m_impl;
protected:
enum Operation {
Destroy,
Call,
Compare,
NumOperations
};
public:
explicit QSlotObjectBase(ImplFn fn) : m_ref(1), m_impl(fn) {}
inline int ref() Q_DECL_NOTHROW { return m_ref.ref(); }
inline void destroyIfLastRef() Q_DECL_NOTHROW
{ if (!m_ref.deref()) m_impl(Destroy, this, Q_NULLPTR, Q_NULLPTR, Q_NULLPTR); }
inline bool compare(void **a) { bool ret = false; m_impl(Compare, this, Q_NULLPTR, a, &ret); return ret; }
inline void call(QObject *r, void **a) { m_impl(Call, this, r, a, Q_NULLPTR); }
protected:
~QSlotObjectBase() {}
private:
Q_DISABLE_COPY(QSlotObjectBase)
};
// implementation of QSlotObjectBase for which the slot is a pointer to member function of a QObject
// Args and R are the List of arguments and the returntype of the signal to which the slot is connected.
template<typename Func, typename Args, typename R> class QSlotObject : public QSlotObjectBase
{
typedef QtPrivate::FunctionPointer<Func> FuncType;
Func function;
static void impl(int which, QSlotObjectBase *this_, QObject *r, void **a, bool *ret)
{
switch (which) {
case Destroy:
delete static_cast<QSlotObject*>(this_);
break;
case Call:
FuncType::template call<Args, R>(static_cast<QSlotObject*>(this_)->function, static_cast<typename FuncType::Object *>(r), a);
break;
case Compare:
*ret = *reinterpret_cast<Func *>(a) == static_cast<QSlotObject*>(this_)->function;
break;
case NumOperations: ;
}
}
public:
explicit QSlotObject(Func f) : QSlotObjectBase(&impl), function(f) {}
};
// implementation of QSlotObjectBase for which the slot is a static function
// Args and R are the List of arguments and the returntype of the signal to which the slot is connected.
template<typename Func, typename Args, typename R> class QStaticSlotObject : public QSlotObjectBase
{
typedef QtPrivate::FunctionPointer<Func> FuncType;
Func function;
static void impl(int which, QSlotObjectBase *this_, QObject *r, void **a, bool *ret)
{
switch (which) {
case Destroy:
delete static_cast<QStaticSlotObject*>(this_);
break;
case Call:
FuncType::template call<Args, R>(static_cast<QStaticSlotObject*>(this_)->function, r, a);
break;
case Compare: // not implemented
case NumOperations:
Q_UNUSED(ret);
}
}
public:
explicit QStaticSlotObject(Func f) : QSlotObjectBase(&impl), function(f) {}
};
// implementation of QSlotObjectBase for which the slot is a functor (or lambda)
// N is the number of arguments
// Args and R are the List of arguments and the returntype of the signal to which the slot is connected.
template<typename Func, int N, typename Args, typename R> class QFunctorSlotObject : public QSlotObjectBase
{
typedef QtPrivate::Functor<Func, N> FuncType;
Func function;
static void impl(int which, QSlotObjectBase *this_, QObject *r, void **a, bool *ret)
{
switch (which) {
case Destroy:
delete static_cast<QFunctorSlotObject*>(this_);
break;
case Call:
FuncType::template call<Args, R>(static_cast<QFunctorSlotObject*>(this_)->function, r, a);
break;
case Compare: // not implemented
case NumOperations:
Q_UNUSED(ret);
}
}
public:
explicit QFunctorSlotObject(const Func &f) : QSlotObjectBase(&impl), function(f) {}
};
}
QT_END_NAMESPACE
#endif