Function returning a QHBoxLayout

[Lykurg]

It depends on how you want use it, but normally a widget is a good choice:

QWidget* GestioneClienteDialog::creaItemCliente(Domain::Persona c)
{
  QWidget* widget = new QWidget();
  //your code like
  widget->setLayout(boxEsterno)
  return widget;

QWidget* GestioneClienteDialog::creaItemCliente(Domain::Persona c)
{
  QWidget* widget = new QWidget();
  //your code like
  widget->setLayout(boxEsterno)
  return widget;

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Make sure that the receiver sets a valid parent for the widget.