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diff --git a/src/core/geometry/qabstractfunctor.cpp b/src/core/geometry/qabstractfunctor.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qabstractfunctor.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DCore {
+
+/*!
+    \class Qt3DCore::QAbstractFunctor
+    \inmodule Qt3DCore
+    \since 5.7
+    \brief QAbstractFunctor is an abstract base class for all functors.
+
+    The QAbstractFunctor is used as a base class for all functors and data
+    generators in Qt3DCore module.
+
+    When user defines a new functor or generator, they need to implement the
+    \l QAbstractFunctor::id() method, which should be done using the \c {QT3D_FUNCTOR}
+    macro in the class definition.
+ */
+/*!
+    \fn qintptr Qt3DCore::QAbstractFunctor::id() const
+
+    Returns a pointer to the id of the functor.
+ */
+/*!
+   \fn qintptr Qt3DCore::functorTypeId()
+
+   Returns a pointer to the type id of the functor.
+*/
+/*!
+    \macro QT3D_FUNCTOR(Class)
+    \relates Qt3DCore::QAbstractFunctor
+
+    This macro assigns functor id to the \a Class, which is used by QAbstractFunctor::functor_cast
+    to determine if the cast can be done.
+ */
+
+/*!
+    \fn template<class T> const T * Qt3DCore::QAbstractFunctor::functor_cast(const QAbstractFunctor *other) const
+
+    This method is used to cast functor \a other to type T if the other is of
+    type T (or of subclass); otherwise returns 0. This method works similarly
+    to \l [QtCore] {qobject_cast(const QObject *object)}{qobject_cast()},
+    except with functors derived from QAbstractFunctor.
+
+    \warning If T was not declared with \l QT3D_FUNCTOR macro, then the results are undefined.
+  */
+
+/*! Desctructor */
+QAbstractFunctor::~QAbstractFunctor()
+{
+
+}
+
+} // Qt3D
+
+QT_END_NAMESPACE
+