Doc snippets: Use nullptr instead of 0 literal

Also mark constructors explicit, where applicable.

Pick-to: 5.15
Fixes: QTBUG-84859
Change-Id: I145d366d854fd6b4373bcc23d0b880d6361d9014
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

11 files changed, 11 insertions, 11 deletions

diff --git a/src/gui/doc/snippets/clipboard/clipwindow.h b/src/gui/doc/snippets/clipboard/clipwindow.h
index 81e50a3c89..6e4fa0c73a 100644
--- a/src/gui/doc/snippets/clipboard/clipwindow.h
+++ b/src/gui/doc/snippets/clipboard/clipwindow.h
@@ -65,7 +65,7 @@ class ClipWindow : public QMainWindow
     Q_OBJECT
 
 public:
-    ClipWindow(QWidget *parent = 0);
+    explicit ClipWindow(QWidget *parent = nullptr);
 
 public slots:
     void updateClipboard();
diff --git a/src/gui/doc/snippets/code/src_gui_opengl_qopenglfunctions.cpp b/src/gui/doc/snippets/code/src_gui_opengl_qopenglfunctions.cpp
index e072c110f2..e4255107d3 100644
--- a/src/gui/doc/snippets/code/src_gui_opengl_qopenglfunctions.cpp
+++ b/src/gui/doc/snippets/code/src_gui_opengl_qopenglfunctions.cpp
@@ -53,7 +53,7 @@
     {
         Q_OBJECT
     public:
-        MyGLWindow(QScreen *screen = 0);
+        explicit MyGLWindow(QScreen *screen = nullptr);
 
     protected:
         void initializeGL();
diff --git a/src/gui/doc/snippets/draganddrop/dragwidget.h b/src/gui/doc/snippets/draganddrop/dragwidget.h
index 709f9338bf..eb069d73d2 100644
--- a/src/gui/doc/snippets/draganddrop/dragwidget.h
+++ b/src/gui/doc/snippets/draganddrop/dragwidget.h
@@ -66,7 +66,7 @@ class DragWidget : public QFrame
     Q_OBJECT
 
 public:
-    DragWidget(QWidget *parent);
+    explicit DragWidget(QWidget *parent = nullptr);
     void setData(const QString &mimetype, const QByteArray &newData);
 
 signals:
diff --git a/src/gui/doc/snippets/draganddrop/mainwindow.h b/src/gui/doc/snippets/draganddrop/mainwindow.h
index 784371d4af..85581e7909 100644
--- a/src/gui/doc/snippets/draganddrop/mainwindow.h
+++ b/src/gui/doc/snippets/draganddrop/mainwindow.h
@@ -67,7 +67,7 @@ class MainWindow : public QMainWindow
     Q_OBJECT
 
 public:
-    MainWindow(QWidget *parent = 0);
+    explicit MainWindow(QWidget *parent = nullptr);
 
 public slots:
     void setDragResult(const QString &actionText);
diff --git a/src/gui/doc/snippets/dragging/mainwindow.h b/src/gui/doc/snippets/dragging/mainwindow.h
index 8a8e43b223..fd7f659b2d 100644
--- a/src/gui/doc/snippets/dragging/mainwindow.h
+++ b/src/gui/doc/snippets/dragging/mainwindow.h
@@ -65,7 +65,7 @@ class MainWindow : public QMainWindow
     Q_OBJECT
 
 public:
-    MainWindow(QWidget *parent = 0);
+    explicit MainWindow(QWidget *parent = nullptr);
 
 protected:
     void mousePressEvent(QMouseEvent *event) override;
diff --git a/src/gui/doc/snippets/dropevents/window.h b/src/gui/doc/snippets/dropevents/window.h
index 6ac35181ed..294ffb74cc 100644
--- a/src/gui/doc/snippets/dropevents/window.h
+++ b/src/gui/doc/snippets/dropevents/window.h
@@ -64,7 +64,7 @@ class Window : public QWidget
     Q_OBJECT
 
 public:
-    Window(QWidget *parent = 0);
+    explicit Window(QWidget *parent = nullptr);
 
 protected:
     void dragEnterEvent(QDragEnterEvent *event) override;
diff --git a/src/gui/doc/snippets/droprectangle/window.h b/src/gui/doc/snippets/droprectangle/window.h
index 5a9ef75d3b..5e2980c812 100644
--- a/src/gui/doc/snippets/droprectangle/window.h
+++ b/src/gui/doc/snippets/droprectangle/window.h
@@ -64,7 +64,7 @@ class Window : public QWidget
     Q_OBJECT
 
 public:
-    Window(QWidget *parent = 0);
+    explicit Window(QWidget *parent = nullptr);
 
 protected:
     void dragMoveEvent(QDragMoveEvent *event) override;
diff --git a/src/gui/doc/snippets/plaintextlayout/window.h b/src/gui/doc/snippets/plaintextlayout/window.h
index 8552ecd4ba..b83472f158 100644
--- a/src/gui/doc/snippets/plaintextlayout/window.h
+++ b/src/gui/doc/snippets/plaintextlayout/window.h
@@ -58,7 +58,7 @@ class Window : public QWidget
     Q_OBJECT
 
 public:
-    Window(QWidget *parent = 0);
+    explicit Window(QWidget *parent = nullptr);
 
 protected:
     void paintEvent(QPaintEvent *event) override;
diff --git a/src/gui/doc/snippets/qstatustipevent/main.cpp b/src/gui/doc/snippets/qstatustipevent/main.cpp
index cc43c56334..6cf63fd875 100644
--- a/src/gui/doc/snippets/qstatustipevent/main.cpp
+++ b/src/gui/doc/snippets/qstatustipevent/main.cpp
@@ -54,7 +54,7 @@
 class MainWindow : public QMainWindow
 {
 public:
-    MainWindow(QWidget *parent = 0);
+    explicit MainWindow(QWidget *parent = nullptr);
 };
 
 //! [0] //! [1]
diff --git a/src/gui/doc/snippets/scribe-overview/main.cpp b/src/gui/doc/snippets/scribe-overview/main.cpp
index 6a0ff7a341..104dee2f53 100644
--- a/src/gui/doc/snippets/scribe-overview/main.cpp
+++ b/src/gui/doc/snippets/scribe-overview/main.cpp
@@ -68,7 +68,7 @@ void mergeFormat(QTextEdit *edit)
 
 int main(int argc, char *argv[])
 {
-    QWidget *parent = 0;
+    QWidget *parent = nullptr;
     QString aStringContainingHTMLtext("<h1>Scribe Overview</h1>");
 
     QApplication app(argc, argv);
diff --git a/src/gui/doc/snippets/textdocument-imagedrop/textedit.h b/src/gui/doc/snippets/textdocument-imagedrop/textedit.h
index 3f570884ba..5db7dd0ad7 100644
--- a/src/gui/doc/snippets/textdocument-imagedrop/textedit.h
+++ b/src/gui/doc/snippets/textdocument-imagedrop/textedit.h
@@ -58,7 +58,7 @@ class TextEdit : public QTextEdit
     Q_OBJECT
 
 public:
-    TextEdit(QWidget *parent=0);
+    explicit TextEdit(QWidget *parent = nullptr);
     bool canInsertFromMimeData( const QMimeData *source ) const override;
     void insertFromMimeData( const QMimeData *source ) override;
 };