Could I manage the resource of Qt without try and catch?

[stereoMatching]

class Wizard : public QDialog
{
  Q_OBJECT
 
public:
  Wizard(QWidget *parent);
 
private slots:
  void what_ever();
 
private:
  QPushButton *what_ever;  
};
 
Wizard::Wizard( QWidget *parent ) : QDialog(parent)
{  
  QGridLayout *layout = new QGridLayout( this );
 
  QScopedPointer<QTextEdit> textEdit(new QTextEdit); 
  layout->addWidget( textEdit.take(), 0, 0, 1, 2 );
 
  what_ever = new QPushButton("whatever");
  layout->addWidget(what_ever, 0, 1, 1, 1);
 
  connect(what_ever, SIGNAL(clicked()), this, SLOT(what_ever()));
}
 
void Wizard::what_ever()
{
  //blah blah blah
}

class Wizard : public QDialog
{
  Q_OBJECT

public:
  Wizard(QWidget *parent);

private slots:
  void what_ever();
  
private:
  QPushButton *what_ever;  
};

Wizard::Wizard( QWidget *parent ) : QDialog(parent)
{  
  QGridLayout *layout = new QGridLayout( this );
    
  QScopedPointer<QTextEdit> textEdit(new QTextEdit); 
  layout->addWidget( textEdit.take(), 0, 0, 1, 2 );

  what_ever = new QPushButton("whatever");
  layout->addWidget(what_ever, 0, 1, 1, 1);

  connect(what_ever, SIGNAL(clicked()), this, SLOT(what_ever()));
}

void Wizard::what_ever()
{
  //blah blah blah
}

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I have some problems about the codes.

1 : What if textEdit throw exception?
If "textEdit" throw exception, that means the
destructor of Wizard would not be called,
What would Qt handle the resource of "layout"?

2 : Could I initialize "what_ever" like this?
layout->addWidget(what_ever = new QPushButton("whatever"), 0, 1, 1, 1);
Is this safe in Qt4(4.8)?Would it have any change to cause memory leak?

Thanks a lot