Cannot understand difference in the code

Why this code works?

QSharedPointer<Client> client = QSharedPointer<Client>(new Client(socket), &QObject::deleteLater);
connect(client.data(), SIGNAL(disconnected(Client*)), this, SLOT(removeClient(Client*)));

But this does not work?

auto client = QSharedPointer<Client>(new Client(socket), &QObject::deleteLater);
connect(client.data(), SIGNAL(disconnected(Client*)), this, SLOT(removeClient(Client*)));

P.S. I'm noobie in C++ (and in English too...)