97 lines
3.0 KiB
C++
97 lines
3.0 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2018 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtQml module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#pragma once
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#include <QtCore/qglobal.h>
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#include <QtQml/private/qtqmlglobal_p.h>
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#include <memory>
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#if __cplusplus > 201402L && __has_include(<optional>)
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#include <optional>
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#else
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namespace std {
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struct nullopt_t {};
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constexpr nullopt_t nullopt {};
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template<typename T>
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class optional {
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public:
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optional() = default;
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optional(nullopt_t) {}
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optional(const T &v) : _value(v), _hasValue(true) {}
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~optional() = default;
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optional &operator =(nullopt_t) {
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_value = T();
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_hasValue = false;
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return *this;
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}
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T operator->() { return _value; }
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T operator*() { return _value; }
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operator bool() const { return _hasValue; }
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bool has_value() const { return _hasValue; }
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T value() const { return _value; }
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private:
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T _value = T();
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bool _hasValue = false;
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};
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}
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#endif
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#if __cplusplus < 201402L && !QT_CONFIG(cxx14_make_unique)\
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&& !defined(__cpp_lib_make_unique)
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namespace std {
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template<typename T, class ...Args>
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unique_ptr<T> make_unique(Args &&...args)
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{ return unique_ptr<T>(new T(std::forward<Args>(args)...)); }
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}
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#endif
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