1 files changed, 7 insertions, 4 deletions
diff --git a/examples/widgets/itemviews/addressbook/addresswidget.cpp b/examples/widgets/itemviews/addressbook/addresswidget.cpp
index 955a766750..5b226793e4 100644
--- a/examples/widgets/itemviews/addressbook/addresswidget.cpp
+++ b/examples/widgets/itemviews/addressbook/addresswidget.cpp
@@ -34,7 +34,10 @@ void AddressWidget::showAddEntryDialog()
 //! [3]
 void AddressWidget::addEntry(const QString &name, const QString &address)
 {
-    if (!table->getContacts().contains({ name, address })) {
+    if (!name.front().isLetter()) {
+        QMessageBox::information(this, tr("Invalid name"),
+            tr("The name must start with a letter."));
+    } else if (!table->getContacts().contains({ name, address })) {
         table->insertRows(0, 1, QModelIndex());
 
         QModelIndex index = table->index(0, 0, QModelIndex());
@@ -146,7 +149,7 @@ void AddressWidget::setupTabs()
 //! [1]
 
 //! [7]
-void AddressWidget::readFromFile(const QString &fileName)
+void AddressWidget::readFromFile()
 {
     QFile file(fileName);
 
@@ -164,14 +167,14 @@ void AddressWidget::readFromFile(const QString &fileName)
         QMessageBox::information(this, tr("No contacts in file"),
                                  tr("The file you are attempting to open contains no contacts."));
     } else {
-        for (const auto &contact: qAsConst(contacts))
+        for (const auto &contact: std::as_const(contacts))
             addEntry(contact.name, contact.address);
     }
 }
 //! [7]
 
 //! [6]
-void AddressWidget::writeToFile(const QString &fileName)
+void AddressWidget::writeToFile()
 {
     QFile file(fileName);