I have such a code and I wonder how should I clean up after it? Should I delete all elements one by one? Should I delete also layouts? Or can I delete just the main element - parent of every other and hope that he will clean up the rest of them?

Qt Code: 
  1. TableTab::TableTab(QWidget *parent) :
  2.     QWidget(parent)
  3. {
  4.     objectNameLabel_ = new QLabel;
  5.     personLabel_ = new QLabel;
  6.     tableWidget_ = new RequestTable(parent);
  7.     summaryBox_ = new QGroupBox;
  8.     commentaryTextEdit_ = new QPlainTextEdit;
  9.     normatywLabel_ = new QLabel;
  10.     sumLabel_ = new QLabel;
  11.     reInvoiceLabel_ = new QLabel;
  12.     QGroupBox *calculationsBox = new QGroupBox;
  13.  
  14.     objectNameLabel_->setText("OBIEKT 1");
  15.     personLabel_->setText("JOLA");
  16.     normatywLabel_->setText("666");
  17.     sumLabel_->setText("667");
  18.     reInvoiceLabel_->setText("668");
  19.  
  20.     QBoxLayout *layout = new QVBoxLayout;
  21.     layout->addWidget(normatywLabel_);
  22.     layout->addWidget(sumLabel_);
  23.     layout->addWidget(reInvoiceLabel_);
  24.     calculationsBox->setLayout(layout);
  25.  
  26.     layout = new QHBoxLayout;
  27.     layout->addWidget(commentaryTextEdit_);
  28.     layout->addWidget(calculationsBox);
  29.     summaryBox_->setLayout(layout);
  30.  
  31.     layout = new QVBoxLayout;
  32.     layout->addWidget(objectNameLabel_);
  33.     layout->addWidget(personLabel_);
  34.     layout->addWidget(tableWidget_);
  35.     layout->addWidget(summaryBox_);
  36.     setLayout(layout);
  37. }
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