QObject::connect()

Lorence

why cant i get rid of this error?

error: no matching function for call to 'MainWindow::connect(PlayList*&, const char*, __gnu_cxx::__alloc_traits<std::allocator<Track> >::value_type*, const char*)'
QObject::connect(ui->tab1List,SIGNAL(clickedToPlay()),&playList[playList.size()-1],SLOT(play()));
^
heres my code:
http://pastebin.com/4cpKTYSB

TheBadger

@Lorence
From your code class Track does not derive from QObject, thus you can not connect to it:

class Track : public QObject 
{
    Q_OBJECT
    ...
};

Edit:
Also the following looks strange:

std::vector<Track> playList;

Since you have a class called PlayList. If that is correct I suggest calling your variable trackList instead.

TheBadger

Another issue, your class Track does not have a slot called play(), there is a playSong() that I suspect you wanted to call.

If you are using Qt 5 use the new connect syntax instead and you will reduce such errors:

connect(ui->tab1List, &PlayList::clickedToPlay, &playList.back(), &Track::playSong);

PS: I replaced the playList[playList.size()-1] with the std::vector::back() function call since it should do the same but the intent is clear.

Lorence

Guys!!! sorry for the late reply, i was so busy from my school projects

heres the error:
error: use of deleted function 'Track::Track(const Track&)'
{ ::new(static_cast<void*>(__p)) _T1(std::forward<_Args>(__args)...); }
^

heres the new code:
http://pastebin.com/PgR8bUeg

mrjj

hi
you have declared your list as using non pointers.
std::vector<Track> playList;
So track must be copy able.
but since its a QObject, its not allowed.
So it must be
std::vector<Track*> playList;

Thats why you get Track(const Track&) error

[edit: fixed typo -> QObject are not copyable SGaist]

Lorence

@TheBadger
I tried to investigate the error, and i found where it is coming from
its from this line
playList.emplace_back(ui->song->text().toStdString());
which is written before the connect() in the code