diff options
Diffstat (limited to 'src/foundation/Qt3DSOption.h')
-rw-r--r-- | src/foundation/Qt3DSOption.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/foundation/Qt3DSOption.h b/src/foundation/Qt3DSOption.h new file mode 100644 index 0000000..18d6c3b --- /dev/null +++ b/src/foundation/Qt3DSOption.h @@ -0,0 +1,104 @@ +/**************************************************************************** +** +** 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 |