Cleanup QtCore examples

Cleanup QtCore examples:
 - use new signal/slot syntax
 - use 0 instead nullptr
 - remove unneeded includes
 - use initializer lists
 - replace foreach with range-based-for loop

Change-Id: I5581f485fa0e9ccf3f4ce6f643908832bc6959bb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

29 files changed, 59 insertions, 77 deletions

diff --git a/examples/corelib/ipc/localfortuneclient/client.h b/examples/corelib/ipc/localfortuneclient/client.h
index 0c1ede94c9..7248428440 100644
--- a/examples/corelib/ipc/localfortuneclient/client.h
+++ b/examples/corelib/ipc/localfortuneclient/client.h
@@ -53,14 +53,12 @@
 
 #include <QDialog>
 #include <QDataStream>
-
-#include <qlocalsocket.h>
+#include <QLocalSocket>
 
 QT_BEGIN_NAMESPACE
 class QLabel;
 class QLineEdit;
 class QPushButton;
-class QLocalSocket;
 QT_END_NAMESPACE
 
 class Client : public QDialog
diff --git a/examples/corelib/ipc/localfortuneserver/main.cpp b/examples/corelib/ipc/localfortuneserver/main.cpp
index 6f8ec539fe..430005a1d3 100644
--- a/examples/corelib/ipc/localfortuneserver/main.cpp
+++ b/examples/corelib/ipc/localfortuneserver/main.cpp
@@ -49,9 +49,6 @@
 ****************************************************************************/
 
 #include <QApplication>
-#include <QtCore>
-
-#include <stdlib.h>
 
 #include "server.h"
 
diff --git a/examples/corelib/ipc/localfortuneserver/server.cpp b/examples/corelib/ipc/localfortuneserver/server.cpp
index be8d4750d6..9be5ed5051 100644
--- a/examples/corelib/ipc/localfortuneserver/server.cpp
+++ b/examples/corelib/ipc/localfortuneserver/server.cpp
@@ -48,15 +48,11 @@
 **
 ****************************************************************************/
 
+#include "server.h"
+
 #include <QtWidgets>
 #include <QtNetwork>
 
-#include <stdlib.h>
-
-#include "server.h"
-#include <qlocalserver.h>
-#include <qlocalsocket.h>
-
 Server::Server(QWidget *parent)
     : QDialog(parent)
 {
diff --git a/examples/corelib/ipc/sharedmemory/dialog.cpp b/examples/corelib/ipc/sharedmemory/dialog.cpp
index ce5a4547bb..4e999d1bcf 100644
--- a/examples/corelib/ipc/sharedmemory/dialog.cpp
+++ b/examples/corelib/ipc/sharedmemory/dialog.cpp
@@ -51,7 +51,6 @@
 #include "dialog.h"
 #include <QFileDialog>
 #include <QBuffer>
-#include <QtCore/QDebug>
 
 /*!
   \class Dialog
@@ -81,10 +80,10 @@ Dialog::Dialog(QWidget *parent)
   : QDialog(parent), sharedMemory("QSharedMemoryExample")
 {
     ui.setupUi(this);
-    connect(ui.loadFromFileButton, SIGNAL(clicked()), SLOT(loadFromFile()));
-    connect(ui.loadFromSharedMemoryButton,
-            SIGNAL(clicked()),
-            SLOT(loadFromMemory()));
+    connect(ui.loadFromFileButton, &QPushButton::clicked,
+            this, &Dialog::loadFromFile);
+    connect(ui.loadFromSharedMemoryButton, &QPushButton::clicked,
+            this, &Dialog::loadFromMemory);
     setWindowTitle(tr("SharedMemory Example"));
 }
 //! [0]
diff --git a/examples/corelib/ipc/sharedmemory/dialog.h b/examples/corelib/ipc/sharedmemory/dialog.h
index 1662654441..693333256c 100644
--- a/examples/corelib/ipc/sharedmemory/dialog.h
+++ b/examples/corelib/ipc/sharedmemory/dialog.h
@@ -51,8 +51,8 @@
 #ifndef DIALOG_H
 #define DIALOG_H
 
-#include <qdialog.h>
-#include <qsharedmemory.h>
+#include <QDialog>
+#include <QSharedMemory>
 #include "ui_dialog.h"
 
 //! [0]
@@ -61,7 +61,7 @@ class Dialog : public QDialog
     Q_OBJECT
 
   public:
-    Dialog(QWidget *parent = 0);
+    Dialog(QWidget *parent = nullptr);
 
   public slots:
     void loadFromFile();
diff --git a/examples/corelib/mimetypes/mimetypebrowser/main.cpp b/examples/corelib/mimetypes/mimetypebrowser/main.cpp
index f4462df411..cf87004a01 100644
--- a/examples/corelib/mimetypes/mimetypebrowser/main.cpp
+++ b/examples/corelib/mimetypes/mimetypebrowser/main.cpp
@@ -55,9 +55,6 @@
 
 #include <QCommandLineParser>
 #include <QCommandLineOption>
-#include <QDebug>
-#include <QMimeDatabase>
-#include <QMimeType>
 
 int main(int argc, char *argv[])
 {
diff --git a/examples/corelib/mimetypes/mimetypebrowser/mimetypemodel.cpp b/examples/corelib/mimetypes/mimetypebrowser/mimetypemodel.cpp
index ee83de092d..f755e060c6 100644
--- a/examples/corelib/mimetypes/mimetypebrowser/mimetypemodel.cpp
+++ b/examples/corelib/mimetypes/mimetypebrowser/mimetypemodel.cpp
@@ -50,9 +50,8 @@
 
 #include "mimetypemodel.h"
 
-#include <QIcon>
-
 #include <QDebug>
+#include <QIcon>
 #include <QMimeDatabase>
 #include <QTextStream>
 #include <QVariant>
diff --git a/examples/corelib/serialization/convert/cborconverter.cpp b/examples/corelib/serialization/convert/cborconverter.cpp
index f906c81062..ad69983eb1 100644
--- a/examples/corelib/serialization/convert/cborconverter.cpp
+++ b/examples/corelib/serialization/convert/cborconverter.cpp
@@ -56,7 +56,6 @@
 #include <QCborArray>
 #include <QCborValue>
 #include <QDataStream>
-#include <QDebug>
 #include <QFloat16>
 #include <QFile>
 #include <QMetaType>
diff --git a/examples/corelib/serialization/savegame/game.cpp b/examples/corelib/serialization/savegame/game.cpp
index 226f6fda11..c39362bc68 100644
--- a/examples/corelib/serialization/savegame/game.cpp
+++ b/examples/corelib/serialization/savegame/game.cpp
@@ -185,7 +185,7 @@ void Game::write(QJsonObject &json) const
     json["player"] = playerObject;
 
     QJsonArray levelArray;
-    for (const Level level : mLevels) {
+    for (const Level &level : mLevels) {
         QJsonObject levelObject;
         level.write(levelObject);
         levelArray.append(levelObject);
diff --git a/examples/corelib/serialization/savegame/level.cpp b/examples/corelib/serialization/savegame/level.cpp
index c7adc6c8ff..6fe46e8938 100644
--- a/examples/corelib/serialization/savegame/level.cpp
+++ b/examples/corelib/serialization/savegame/level.cpp
@@ -97,7 +97,7 @@ void Level::write(QJsonObject &json) const
 {
     json["name"] = mName;
     QJsonArray npcArray;
-    for (const Character npc : mNpcs) {
+    for (const Character &npc : mNpcs) {
         QJsonObject npcObject;
         npc.write(npcObject);
         npcArray.append(npcObject);
diff --git a/examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp b/examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp
index b3e4af5dc8..2603f041b2 100644
--- a/examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp
+++ b/examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp
@@ -48,14 +48,13 @@
 **
 ****************************************************************************/
 
+#include "mandelbrotwidget.h"
+
 #include <QPainter>
 #include <QKeyEvent>
 
 #include <math.h>
 
-#include "mandelbrotwidget.h"
-
-
 //! [0]
 const double DefaultCenterX = -0.637011f;
 const double DefaultCenterY = -0.0395159f;
@@ -75,7 +74,8 @@ MandelbrotWidget::MandelbrotWidget(QWidget *parent)
     pixmapScale = DefaultScale;
     curScale = DefaultScale;
 
-    connect(&thread, SIGNAL(renderedImage(QImage,double)), this, SLOT(updatePixmap(QImage,double)));
+    connect(&thread, &RenderThread::renderedImage,
+            this, &MandelbrotWidget::updatePixmap);
 
     setWindowTitle(tr("Mandelbrot"));
 #ifndef QT_NO_CURSOR
diff --git a/examples/corelib/threads/mandelbrot/mandelbrotwidget.h b/examples/corelib/threads/mandelbrot/mandelbrotwidget.h
index a04bfa6e81..cb40962535 100644
--- a/examples/corelib/threads/mandelbrot/mandelbrotwidget.h
+++ b/examples/corelib/threads/mandelbrot/mandelbrotwidget.h
@@ -62,7 +62,7 @@ class MandelbrotWidget : public QWidget
     Q_OBJECT
 
 public:
-    MandelbrotWidget(QWidget *parent = 0);
+    MandelbrotWidget(QWidget *parent = nullptr);
 
 protected:
     void paintEvent(QPaintEvent *event) override;
diff --git a/examples/corelib/threads/mandelbrot/renderthread.cpp b/examples/corelib/threads/mandelbrot/renderthread.cpp
index c57b696e25..eee44c7242 100644
--- a/examples/corelib/threads/mandelbrot/renderthread.cpp
+++ b/examples/corelib/threads/mandelbrot/renderthread.cpp
@@ -50,7 +50,7 @@
 
 #include "renderthread.h"
 
-#include <QtWidgets>
+#include <QImage>
 #include <cmath>
 
 //! [0]
diff --git a/examples/corelib/threads/mandelbrot/renderthread.h b/examples/corelib/threads/mandelbrot/renderthread.h
index b5e9226fb8..4f0394d554 100644
--- a/examples/corelib/threads/mandelbrot/renderthread.h
+++ b/examples/corelib/threads/mandelbrot/renderthread.h
@@ -66,7 +66,7 @@ class RenderThread : public QThread
     Q_OBJECT
 
 public:
-    RenderThread(QObject *parent = 0);
+    RenderThread(QObject *parent = nullptr);
     ~RenderThread();
 
     void render(double centerX, double centerY, double scaleFactor, QSize resultSize);
diff --git a/examples/corelib/threads/queuedcustomtype/block.cpp b/examples/corelib/threads/queuedcustomtype/block.cpp
index a5058cc5ae..9cfad8673c 100644
--- a/examples/corelib/threads/queuedcustomtype/block.cpp
+++ b/examples/corelib/threads/queuedcustomtype/block.cpp
@@ -48,8 +48,6 @@
 **
 ****************************************************************************/
 
-#include <QColor>
-#include <QRect>
 #include "block.h"
 
 Block::Block()
@@ -57,9 +55,8 @@ Block::Block()
 }
 
 Block::Block(const Block &other)
+    : m_rect(other.m_rect), m_color(other.m_color)
 {
-    m_rect = other.m_rect;
-    m_color = other.m_color;
 }
 
 Block::~Block()
@@ -67,9 +64,8 @@ Block::~Block()
 }
 
 Block::Block(const QRect &rect, const QColor &color)
+    : m_rect(rect), m_color(color)
 {
-    m_rect = rect;
-    m_color = color;
 }
 
 QColor Block::color() const
diff --git a/examples/corelib/threads/queuedcustomtype/block.h b/examples/corelib/threads/queuedcustomtype/block.h
index 547cc10f0a..eef48b25c2 100644
--- a/examples/corelib/threads/queuedcustomtype/block.h
+++ b/examples/corelib/threads/queuedcustomtype/block.h
@@ -52,7 +52,6 @@
 #define BLOCK_H
 
 #include <QColor>
-#include <QDebug>
 #include <QMetaType>
 #include <QRect>
 
diff --git a/examples/corelib/threads/queuedcustomtype/renderthread.h b/examples/corelib/threads/queuedcustomtype/renderthread.h
index 318ef293b4..9375b60e74 100644
--- a/examples/corelib/threads/queuedcustomtype/renderthread.h
+++ b/examples/corelib/threads/queuedcustomtype/renderthread.h
@@ -62,7 +62,7 @@ class RenderThread : public QThread
     Q_OBJECT
 
 public:
-    RenderThread(QObject *parent = 0);
+    RenderThread(QObject *parent = nullptr);
     ~RenderThread();
 
     void processImage(const QImage &image);
diff --git a/examples/corelib/threads/queuedcustomtype/window.cpp b/examples/corelib/threads/queuedcustomtype/window.cpp
index 0d3f80aba4..183d9824cb 100644
--- a/examples/corelib/threads/queuedcustomtype/window.cpp
+++ b/examples/corelib/threads/queuedcustomtype/window.cpp
@@ -48,30 +48,34 @@
 **
 ****************************************************************************/
 
-#include <QtWidgets>
 #include "window.h"
+#include <QtWidgets>
 
 //! [Window constructor start]
-Window::Window()
+Window::Window(QWidget *parent)
+    : QWidget(parent), thread(new RenderThread(this))
 {
-    thread = new RenderThread();
 //! [Window constructor start] //! [set up widgets and connections]
 
-    label = new QLabel();
+    label = new QLabel(this);
     label->setAlignment(Qt::AlignCenter);
 
-    loadButton = new QPushButton(tr("&Load image..."));
-    resetButton = new QPushButton(tr("&Stop"));
+    loadButton = new QPushButton(tr("&Load image..."), this);
+    resetButton = new QPushButton(tr("&Stop"), this);
     resetButton->setEnabled(false);
 
-    connect(loadButton, SIGNAL(clicked()), this, SLOT(loadImage()));
-    connect(resetButton, SIGNAL(clicked()), thread, SLOT(stopProcess()));
-    connect(thread, SIGNAL(finished()), this, SLOT(resetUi()));
+    connect(loadButton, &QPushButton::clicked,
+            this, QOverload<>::of(&Window::loadImage));
+    connect(resetButton, &QPushButton::clicked,
+            thread, &RenderThread::stopProcess);
+    connect(thread, &RenderThread::finished,
+            this, &Window::resetUi);
 //! [set up widgets and connections] //! [connecting signal with custom type]
-    connect(thread, SIGNAL(sendBlock(Block)), this, SLOT(addBlock(Block)));
+    connect(thread, &RenderThread::sendBlock,
+            this, &Window::addBlock);
 //! [connecting signal with custom type]
 
-    QHBoxLayout *buttonLayout = new QHBoxLayout();
+    QHBoxLayout *buttonLayout = new QHBoxLayout;
     buttonLayout->addStretch();
     buttonLayout->addWidget(loadButton);
     buttonLayout->addWidget(resetButton);
diff --git a/examples/corelib/threads/queuedcustomtype/window.h b/examples/corelib/threads/queuedcustomtype/window.h
index c472c0fea7..4215dfd5a7 100644
--- a/examples/corelib/threads/queuedcustomtype/window.h
+++ b/examples/corelib/threads/queuedcustomtype/window.h
@@ -65,7 +65,7 @@ class Window : public QWidget
     Q_OBJECT
 
 public:
-    Window();
+    Window(QWidget *parent = nullptr);
     void loadImage(const QImage &image);
 
 public slots:
diff --git a/examples/corelib/tools/contiguouscache/randomlistmodel.cpp b/examples/corelib/tools/contiguouscache/randomlistmodel.cpp
index ccaa45a28b..d028b896f2 100644
--- a/examples/corelib/tools/contiguouscache/randomlistmodel.cpp
+++ b/examples/corelib/tools/contiguouscache/randomlistmodel.cpp
@@ -49,7 +49,6 @@
 ****************************************************************************/
 #include "randomlistmodel.h"
 #include <QRandomGenerator>
-#include <stdlib.h>
 
 static const int bufferSize(500);
 static const int lookAhead(100);
diff --git a/examples/corelib/tools/contiguouscache/randomlistmodel.h b/examples/corelib/tools/contiguouscache/randomlistmodel.h
index e6192b434f..1fabb0d9f5 100644
--- a/examples/corelib/tools/contiguouscache/randomlistmodel.h
+++ b/examples/corelib/tools/contiguouscache/randomlistmodel.h
@@ -59,7 +59,7 @@ class RandomListModel : public QAbstractListModel
 {
     Q_OBJECT
 public:
-    RandomListModel(QObject *parent = 0);
+    RandomListModel(QObject *parent = nullptr);
     ~RandomListModel();
 
     int rowCount(const QModelIndex & = QModelIndex()) const override;
diff --git a/examples/corelib/tools/customtype/main.cpp b/examples/corelib/tools/customtype/main.cpp
index ced317e208..d50bf9efea 100644
--- a/examples/corelib/tools/customtype/main.cpp
+++ b/examples/corelib/tools/customtype/main.cpp
@@ -49,6 +49,7 @@
 ****************************************************************************/
 
 #include <QCoreApplication>
+#include <QDebug>
 #include <QVariant>
 #include "message.h"
 
diff --git a/examples/corelib/tools/customtype/message.cpp b/examples/corelib/tools/customtype/message.cpp
index 8b2c295e46..cc96aee978 100644
--- a/examples/corelib/tools/customtype/message.cpp
+++ b/examples/corelib/tools/customtype/message.cpp
@@ -50,15 +50,16 @@
 
 #include "message.h"
 
+#include <QDebug>
+
 //! [Message class implementation]
 Message::Message()
 {
 }
 
 Message::Message(const Message &other)
+    : m_body(other.m_body), m_headers(other.m_headers)
 {
-    m_body = other.m_body;
-    m_headers = other.m_headers;
 }
 
 Message::~Message()
@@ -67,9 +68,8 @@ Message::~Message()
 //! [Message class implementation]
 
 Message::Message(const QString &body, const QStringList &headers)
+    : m_body(body), m_headers(headers)
 {
-    m_body = body;
-    m_headers = headers;
 }
 
 //! [custom type streaming operator]
diff --git a/examples/corelib/tools/customtype/message.h b/examples/corelib/tools/customtype/message.h
index 9871a7d52d..c1b8243237 100644
--- a/examples/corelib/tools/customtype/message.h
+++ b/examples/corelib/tools/customtype/message.h
@@ -51,7 +51,6 @@
 #ifndef MESSAGE_H
 #define MESSAGE_H
 
-#include <QDebug>
 #include <QMetaType>
 #include <QStringList>
 
diff --git a/examples/corelib/tools/customtypesending/main.cpp b/examples/corelib/tools/customtypesending/main.cpp
index 966c284d9a..c5d643b9d1 100644
--- a/examples/corelib/tools/customtypesending/main.cpp
+++ b/examples/corelib/tools/customtypesending/main.cpp
@@ -57,19 +57,20 @@ int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
 
-    Window window1;
     QStringList headers;
     headers << "Subject: Hello World"
             << "From: address@example.com";
     QString body = "This is a test.\r\n";
     Message message(body, headers);
+
+    Window window1;
     window1.setMessage(message);
 
     Window window2;
-    QObject::connect(&window1, SIGNAL(messageSent(Message)),
-                     &window2, SLOT(setMessage(Message)));
-    QObject::connect(&window2, SIGNAL(messageSent(Message)),
-                     &window1, SLOT(setMessage(Message)));
+    QObject::connect(&window1, &Window::messageSent,
+                     &window2, &Window::setMessage);
+    QObject::connect(&window2, &Window::messageSent,
+                     &window1, &Window::setMessage);
     window1.show();
     window2.show();
     return app.exec();
diff --git a/examples/corelib/tools/customtypesending/message.cpp b/examples/corelib/tools/customtypesending/message.cpp
index c990768079..9386b93898 100644
--- a/examples/corelib/tools/customtypesending/message.cpp
+++ b/examples/corelib/tools/customtypesending/message.cpp
@@ -55,9 +55,8 @@ Message::Message()
 }
 
 Message::Message(const Message &other)
+    : m_body(other.m_body), m_headers(other.m_headers)
 {
-    m_body = other.m_body;
-    m_headers = other.m_headers;
 }
 
 Message::~Message()
@@ -65,9 +64,8 @@ Message::~Message()
 }
 
 Message::Message(const QString &body, const QStringList &headers)
+    : m_body(body), m_headers(headers)
 {
-    m_body = body;
-    m_headers = headers;
 }
 
 QString Message::body() const
diff --git a/examples/corelib/tools/customtypesending/message.h b/examples/corelib/tools/customtypesending/message.h
index a8d6d6be05..a93f111e45 100644
--- a/examples/corelib/tools/customtypesending/message.h
+++ b/examples/corelib/tools/customtypesending/message.h
@@ -51,7 +51,6 @@
 #ifndef MESSAGE_H
 #define MESSAGE_H
 
-#include <QDebug>
 #include <QMetaType>
 #include <QStringList>
 
diff --git a/examples/corelib/tools/customtypesending/window.cpp b/examples/corelib/tools/customtypesending/window.cpp
index 224656f94c..db4b52a985 100644
--- a/examples/corelib/tools/customtypesending/window.cpp
+++ b/examples/corelib/tools/customtypesending/window.cpp
@@ -52,14 +52,15 @@
 #include "window.h"
 
 //! [Window constructor]
-Window::Window()
+Window::Window(QWidget *parent)
+    : QWidget(parent), editor(new QTextEdit(this))
 {
-    editor = new QTextEdit();
     QPushButton *sendButton = new QPushButton(tr("&Send message"));
 
-    connect(sendButton, SIGNAL(clicked()), this, SLOT(sendMessage()));
+    connect(sendButton, &QPushButton::clicked,
+            this, &Window::sendMessage);
 
-    QHBoxLayout *buttonLayout = new QHBoxLayout();
+    QHBoxLayout *buttonLayout = new QHBoxLayout;
     buttonLayout->addStretch();
     buttonLayout->addWidget(sendButton);
     buttonLayout->addStretch();
diff --git a/examples/corelib/tools/customtypesending/window.h b/examples/corelib/tools/customtypesending/window.h
index d050931b74..048fecef67 100644
--- a/examples/corelib/tools/customtypesending/window.h
+++ b/examples/corelib/tools/customtypesending/window.h
@@ -62,7 +62,7 @@ class Window : public QWidget
     Q_OBJECT
 
 public:
-    Window();
+    Window(QWidget *parent = nullptr);
 
 signals:
     void messageSent(const Message &message);