Polish the QML reference examples

- Use member initialization, which allows for using
  constructors from the base classes
- Use qsizetype for indexes
- Use qInfo() instead of qWarning() for printing
- Add spaces/fix formatting

Pick-to: 6.2
Change-Id: Iebce1b810ce00f29395207d93303363b3b71e52e
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 7 insertions, 5 deletions

diff --git a/examples/qml/referenceexamples/coercion/person.h b/examples/qml/referenceexamples/coercion/person.h
index 7e2828da04..1ec095e841 100644
--- a/examples/qml/referenceexamples/coercion/person.h
+++ b/examples/qml/referenceexamples/coercion/person.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2017 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -47,6 +47,7 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+
 #ifndef PERSON_H
 #define PERSON_H
 
@@ -63,16 +64,17 @@ class Person : public QObject
     QML_UNCREATABLE("Person is an abstract base class.")
     //![0]
 public:
-    Person(QObject *parent = nullptr);
+    using QObject::QObject;
 
     QString name() const;
     void setName(const QString &);
 
     int shoeSize() const;
     void setShoeSize(int);
+
 private:
     QString m_name;
-    int m_shoeSize;
+    int m_shoeSize = 0;
 };
 
 
@@ -82,7 +84,7 @@ class Boy : public Person
     Q_OBJECT
     QML_ELEMENT
 public:
-    Boy(QObject * parent = nullptr);
+    using Person::Person;
 };
 
 //! [girl class]
@@ -91,7 +93,7 @@ class Girl : public Person
     Q_OBJECT
     QML_ELEMENT
 public:
-    Girl(QObject * parent = nullptr);
+    using Person::Person;
 };
 //! [girl class]