Documentation: Start using the \nullptr macro

Task-number: PYSIDE-903
Change-Id: I0c4640eb20157673eabb131e8834e79cbbf95d5c
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

src/qml/jsapi/qjsvalue.cpp

@@ -1343,11 +1343,11 @@ bool QJSValue::hasOwnProperty(const QString &name) const
 
 /*!
  * If this QJSValue is a QObject, returns the QObject pointer
- * that the QJSValue represents; otherwise, returns 0.
+ * that the QJSValue represents; otherwise, returns \nullptr.
  *
  * If the QObject that this QJSValue wraps has been deleted,
- * this function returns 0 (i.e. it is possible for toQObject()
- * to return 0 even when isQObject() returns true).
+ * this function returns \nullptr (i.e. it is possible for toQObject()
+ * to return \nullptr even when isQObject() returns true).
  *
  * \sa isQObject()
  */

src/qml/qml/qqmlcomponent.cpp

@@ -756,12 +756,12 @@ QQmlComponent::QQmlComponent(QQmlComponentPrivate &dd, QObject *parent)
 }
 
 /*!
-    Create an object instance from this component. Returns 0 if creation
+    Create an object instance from this component. Returns \nullptr if creation
     failed. \a context specifies the context within which to create the object
     instance.
 
-    If \a context is 0 (the default), it will create the instance in the
-    engine' s \l {QQmlEngine::rootContext()}{root context}.
+    If \a context is \nullptr (the default), it will create the instance in the
+    \l {QQmlEngine::rootContext()}{root context} of the engine.
 
     The ownership of the returned object instance is transferred to the caller.
 
@@ -791,7 +791,7 @@ QObject *QQmlComponent::create(QQmlContext *context)
     In general, programmers should use QQmlComponent::create() to create object
     instances.
 
-    Create an object instance from this component. Returns 0 if creation
+    Create an object instance from this component. Returns \nullptr if creation
     failed. \a publicContext specifies the context within which to create the object
     instance.
 

src/qml/qml/qqmlengine.cpp

@@ -1304,9 +1304,7 @@ void QQmlEngine::addImageProvider(const QString &providerId, QQmlImageProviderBa
 }
 
 /*!
-  Returns the image provider set for \a providerId.
-
-  Returns the provider if it was found; otherwise returns 0.
+  Returns the image provider set for \a providerId if found; otherwise returns \nullptr.
 
   \sa QQuickImageProvider
 */

src/qml/qml/qqmllist.cpp

@@ -184,7 +184,7 @@ bool QQmlListReference::isValid() const
 }
 
 /*!
-Returns the list property's object.  Returns 0 if the reference is invalid.
+Returns the list property's object. Returns \nullptr if the reference is invalid.
 */
 QObject *QQmlListReference::object() const
 {
@@ -193,8 +193,8 @@ QObject *QQmlListReference::object() const
 }
 
 /*!
-Returns the QMetaObject for the elements stored in the list property.  Returns 0 if the reference
-is invalid.
+Returns the QMetaObject for the elements stored in the list property,
+or \nullptr if the reference is invalid.
 
 The QMetaObject can be used ahead of time to determine whether a given instance can be added
 to a list.

src/quick/items/qquickitem.cpp

@@ -4798,7 +4798,7 @@ QQuickItem *QQuickItem::nextItemInFocusChain(bool forward)
     Returns the first visible child item found at point (\a x, \a y) within
     the coordinate system of this item.
 
-    Returns 0 if there is no such item.
+    Returns \nullptr if there is no such item.
 */
 QQuickItem *QQuickItem::childAt(qreal x, qreal y) const
 {
@@ -7222,7 +7222,7 @@ bool QQuickItem::isFocusScope() const
     If this item is a focus scope, this returns the item in its focus chain
     that currently has focus.
 
-    Returns 0 if this item is not a focus scope.
+    Returns \nullptr if this item is not a focus scope.
   */
 QQuickItem *QQuickItem::scopedFocusItem() const
 {
@@ -8158,7 +8158,7 @@ bool QQuickItem::isTextureProvider() const
     \fn QSGTextureProvider *QQuickItem::textureProvider() const
 
     Returns the texture provider for an item. The default implementation
-    returns 0.
+    returns \nullptr.
 
     This function may only be called on the rendering thread.
  */

src/quick/scenegraph/util/qsgtexture.cpp

@@ -388,7 +388,7 @@ QSGTexture::~QSGTexture()
     it to a shader that operates on the texture coordinates 0-1 instead
     of the texture subrect inside the atlas.
 
-    If the texture is not part of a texture atlas, this function returns 0.
+    If the texture is not part of a texture atlas, this function returns \nullptr.
 
     Implementations of this function are recommended to return the same instance
     for multiple calls to limit memory usage.

src/quick/util/qquickimageprovider.cpp

@@ -436,7 +436,7 @@ QPixmap QQuickImageProvider::requestPixmap(const QString &id, QSize *size, const
 
 /*!
     Implement this method to return the texture with \a id. The default
-    implementation returns 0.
+    implementation returns \nullptr.
 
     The \a id is the requested image source, with the "image:" scheme and
     provider identifier removed. For example, if the image \l{Image::}{source}