1 files changed, 104 insertions, 0 deletions
diff --git a/src/foundation/Qt3DSOption.h b/src/foundation/Qt3DSOption.h
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+++ b/src/foundation/Qt3DSOption.h
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+/****************************************************************************
+**
+** Copyright (C) 2008-2012 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** 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 General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) 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.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-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT3DS_FOUNDATION_OPTION_H
+#define QT3DS_FOUNDATION_OPTION_H
+
+#include "foundation/Qt3DS.h"
+#include "foundation/Qt3DSAssert.h"
+
+namespace qt3ds {
+namespace foundation {
+
+    struct Empty
+    {
+    };
+
+    template <typename TDataType>
+    class Option
+    {
+        TDataType mData;
+        bool mHasValue;
+
+    public:
+        Option(const TDataType &data)
+            : mData(data)
+            , mHasValue(true)
+        {
+        }
+        Option(const Empty &)
+            : mHasValue(false)
+        {
+        }
+        Option()
+            : mHasValue(false)
+        {
+        }
+        Option(const Option &other)
+            : mData(other.mData)
+            , mHasValue(other.mHasValue)
+        {
+        }
+        Option &operator=(const Option &other)
+        {
+            mData = other.mData;
+            mHasValue = other.mHasValue;
+            return *this;
+        }
+
+        bool isEmpty() const { return !mHasValue; }
+        void setEmpty() { mHasValue = false; }
+        bool hasValue() const { return mHasValue; }
+
+        const TDataType &getValue() const
+        {
+            QT3DS_ASSERT(mHasValue);
+            return mData;
+        }
+        TDataType &getValue()
+        {
+            QT3DS_ASSERT(mHasValue);
+            return mData;
+        }
+        TDataType &unsafeGetValue() { return mData; }
+
+        operator const TDataType &() const { return getValue(); }
+        operator TDataType &() { return getValue(); }
+
+        const TDataType *operator->() const { return &getValue(); }
+        TDataType *operator->() { return &getValue(); }
+
+        const TDataType &operator*() const { return getValue(); }
+        TDataType &operator*() { return getValue(); }
+    };
+}
+}
+
+#endif
+\ No newline at end of file