4 files changed, 24 insertions, 14 deletions
diff --git a/src/corelib/kernel/qmetaobject.cpp b/src/corelib/kernel/qmetaobject.cpp
index 27153e0c4d..8082b7fe9b 100644
--- a/src/corelib/kernel/qmetaobject.cpp
+++ b/src/corelib/kernel/qmetaobject.cpp
@@ -216,8 +216,8 @@ private:
 
     Constructs a new instance of this class. You can pass up to ten arguments
     (\a val0, \a val1, \a val2, \a val3, \a val4, \a val5, \a val6, \a val7,
-    \a val8, and \a val9) to the constructor. Returns the new object, or 0 if
-    no suitable constructor is available.
+    \a val8, and \a val9) to the constructor. Returns the new object, or
+    \nullptr if no suitable constructor is available.
 
     Note that only constructors that are declared with the Q_INVOKABLE
     modifier are made available through the meta-object system.
@@ -321,8 +321,8 @@ const char *QMetaObject::className() const
 /*!
     \fn QMetaObject *QMetaObject::superClass() const
 
-    Returns the meta-object of the superclass, or 0 if there is no
-    such object.
+    Returns the meta-object of the superclass, or \nullptr if there is
+    no such object.
 
     \sa className()
 */
@@ -2615,7 +2615,7 @@ int QMetaEnum::keyCount() const
 }
 
 /*!
-    Returns the key with the given \a index, or 0 if no such key exists.
+    Returns the key with the given \a index, or \nullptr if no such key exists.
 
     \sa keyCount(), value(), valueToKey()
 */
@@ -2737,7 +2737,7 @@ int QMetaEnum::keyToValue(const char *key, bool *ok) const
 
 /*!
     Returns the string that is used as the name of the given
-    enumeration \a value, or 0 if \a value is not defined.
+    enumeration \a value, or \nullptr if \a value is not defined.
 
     For flag types, use valueToKeys().
 
diff --git a/src/corelib/kernel/qmetatype.cpp b/src/corelib/kernel/qmetatype.cpp
index b9e35e28e4..a1d53be197 100644
--- a/src/corelib/kernel/qmetatype.cpp
+++ b/src/corelib/kernel/qmetatype.cpp
@@ -421,8 +421,8 @@ struct DefinedTypesFilter {
     pointer of this type. (given by QVariant::data for example)
 
     If the type is an enumeration, flags() contains QMetaType::IsEnumeration, and this function
-    returns the QMetaObject of the enclosing object if the enum was registered as a Q_ENUM or 0
-    otherwise
+    returns the QMetaObject of the enclosing object if the enum was registered as a Q_ENUM or
+    \nullptr otherwise
 
     \sa QMetaType::metaObjectForType(), QMetaType::flags()
 */
diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index 600a801fe0..c0c009f254 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -1763,7 +1763,7 @@ void QObject::killTimer(int id)
     \fn template<typename T> T *QObject::findChild(const QString &name, Qt::FindChildOptions options) const
 
     Returns the child of this object that can be cast into type T and
-    that is called \a name, or 0 if there is no such object.
+    that is called \a name, or \nullptr if there is no such object.
     Omitting the \a name argument causes all object names to be matched.
     The search is performed recursively, unless \a options specifies the
     option FindDirectChildrenOnly.
@@ -4342,6 +4342,12 @@ QDebug operator<<(QDebug dbg, const QObject *o)
     in a QVariant, you can convert them to strings. Likewise, passing them to
     QDebug will print out their names.
 
+    Mind that the enum values are stored as signed \c int in the meta object system.
+    Registering enumerations with values outside the range of values valid for \c int
+    will lead to overflows and potentially undefined behavior when accessing them through
+    the meta object system. QML, for example, does access registered enumerations through
+    the meta object system.
+
     \sa {Qt's Property System}
 */
 
@@ -4393,6 +4399,12 @@ QDebug operator<<(QDebug dbg, const QObject *o)
     used in a QVariant, you can convert them to strings. Likewise, passing them
     to QDebug will print out their names.
 
+    Mind that the enum values are stored as signed \c int in the meta object system.
+    Registering enumerations with values outside the range of values valid for \c int
+    will lead to overflows and potentially undefined behavior when accessing them through
+    the meta object system. QML, for example, does access registered enumerations through
+    the meta object system.
+
     \sa {Qt's Property System}
 */
 
@@ -4450,7 +4462,7 @@ QDebug operator<<(QDebug dbg, const QObject *o)
     macro, it must appear in the private section of a class definition.
 
     Q_GADGETs can have Q_ENUM, Q_PROPERTY and Q_INVOKABLE, but they cannot have
-    signals or slots
+    signals or slots.
 
     Q_GADGET makes a class member, \c{staticMetaObject}, available.
     \c{staticMetaObject} is of type QMetaObject and provides access to the
diff --git a/src/corelib/kernel/qtestsupport_core.cpp b/src/corelib/kernel/qtestsupport_core.cpp
index e00ad75fef..c54b933f94 100644
--- a/src/corelib/kernel/qtestsupport_core.cpp
+++ b/src/corelib/kernel/qtestsupport_core.cpp
@@ -59,8 +59,7 @@ Q_CORE_EXPORT void QTestPrivate::qSleep(int ms)
 #endif
 }
 
-/*! \fn template <typename Functor> bool qWaitFor(Functor predicate, int timeout)
-    \relates QTest
+/*! \fn template <typename Functor> bool QTest::qWaitFor(Functor predicate, int timeout)
 
     Waits for \a timeout milliseconds or until the \a predicate returns true.
 
@@ -77,8 +76,7 @@ Q_CORE_EXPORT void QTestPrivate::qSleep(int ms)
 */
 
 
-/*! \fn void qWait(int ms)
-    \relates QTest
+/*! \fn void QTest::qWait(int ms)
 
     Waits for \a ms milliseconds. While waiting, events will be processed and
     your test will stay responsive to user interface events or network communication.