hyperion.ng/include/utils/WeakConnect.h

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#ifndef WEAKCONNECT_H
#define WEAKCONNECT_H
#include <type_traits>
// Qt includes
#include <QObject>
template <typename Func1, typename Func2, typename std::enable_if_t<std::is_member_pointer<Func2>::value, int> = 0>
static inline QMetaObject::Connection weakConnect(typename QtPrivate::FunctionPointer<Func1>::Object* sender,
Func1 signal,
typename QtPrivate::FunctionPointer<Func2>::Object* receiver,
Func2 slot)
{
QMetaObject::Connection conn_normal = QObject::connect(sender, signal, receiver, slot);
QMetaObject::Connection* conn_delete = new QMetaObject::Connection();
*conn_delete = QObject::connect(sender, signal, [conn_normal, conn_delete]() {
QObject::disconnect(conn_normal);
QObject::disconnect(*conn_delete);
delete conn_delete;
});
return conn_normal;
}
template <typename Func1, typename Func2, typename std::enable_if_t<!std::is_member_pointer<Func2>::value, int> = 0>
static inline QMetaObject::Connection weakConnect(typename QtPrivate::FunctionPointer<Func1>::Object* sender,
Func1 signal,
Func2 slot)
{
QMetaObject::Connection conn_normal = QObject::connect(sender, signal, slot);
QMetaObject::Connection* conn_delete = new QMetaObject::Connection();
*conn_delete = QObject::connect(sender, signal, [conn_normal, conn_delete]() {
QObject::disconnect(conn_normal);
QObject::disconnect(*conn_delete);
delete conn_delete;
});
return conn_normal;
}
template <typename Func1, typename Func2, typename std::enable_if_t<!std::is_member_pointer<Func2>::value, int> = 0>
static inline QMetaObject::Connection weakConnect(typename QtPrivate::FunctionPointer<Func1>::Object* sender,
Func1 signal,
typename QtPrivate::FunctionPointer<Func2>::Object* receiver,
Func2 slot)
{
Q_UNUSED(receiver);
QMetaObject::Connection conn_normal = QObject::connect(sender, signal, slot);
QMetaObject::Connection* conn_delete = new QMetaObject::Connection();
*conn_delete = QObject::connect(sender, signal, [conn_normal, conn_delete]() {
QObject::disconnect(conn_normal);
QObject::disconnect(*conn_delete);
delete conn_delete;
});
return conn_normal;
}
#endif // WEAKCONNECT_H