Wrong C++ syntax

[d_stranz]

Sorry, I am typing faster than I am thinking. Try this:

QObject::connect(ui->list,        //object
&QListWidget::itemClicked,      //signal
[this]( QListWidgetItem * pItem ) { this->ui->list_2->addItem( pItem ); }) ; // lambda slot

QObject::connect(ui->list,        //object
&QListWidget::itemClicked,      //signal
[this]( QListWidgetItem * pItem ) { this->ui->list_2->addItem( pItem ); }) ; // lambda slot

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There is no "receiver" pointer (the normal third argument to connect()) when using a connect() with the lambda syntax.