Unused parameters in slots

I have declared a slot as follows,

Code:

---

class Shell {
    Q_OBJECT
    public slots:
       void treeExpanded (const QModelIndex &index);
}

---

Now, I don't have a use for the index parameter. Gcc gives a warning in this case, saying index is unused. (I try to keep my code free of warnings :rolleyes: )

Now, if I don't want that warning I can say,

Code:

---

class Shell {
    Q_OBJECT
    public slots:
       void treeExpanded (__attribute__((unused)) const QModelIndex &index);
}

---

The warning goes off but the moc generated bad code. I get a compile error for the moc_Shell.cpp

Quote:

---

moc_Shell.cpp: In member function `virtual int
Shell::qt_metacall(QMetaObject::Call, int, void**)':
moc_Shell.cpp:78: error: parse error before `*' token

---

Is there any solution to this? Thanks...

Yes ;)

Code:

---

//// *.h
void treeExpanded (const QModelIndex &);
 
//// *.cpp
void Shell::treeExpanded (const QModelIndex &)
{
}

---

Or Q_UNUSED

Thanks, zlatko; it worked.

I ain't familiar with the quirks of C++.