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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQMLNULLABLEVALUE_P_H
+#define QQMLNULLABLEVALUE_P_H
+
+//
+// W A R N I N G
+// -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+QT_BEGIN_NAMESPACE
+
+template<typename T>
+struct QQmlNullableValue
+{
+ QQmlNullableValue()
+ : isNull(true), value(T()) {}
+ QQmlNullableValue(const QQmlNullableValue<T> &o)
+ : isNull(o.isNull), value(o.value) {}
+ QQmlNullableValue(const T &t)
+ : isNull(false), value(t) {}
+ QQmlNullableValue<T> &operator=(const T &t)
+ { isNull = false; value = t; return *this; }
+ QQmlNullableValue<T> &operator=(const QQmlNullableValue<T> &o)
+ { isNull = o.isNull; value = o.value; return *this; }
+ operator T() const { return value; }
+
+ void invalidate() { isNull = true; }
+ bool isValid() const { return !isNull; }
+ bool isNull;
+ T value;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQMLNULLABLEVALUE_P_H