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+/****************************************************************************
+**
+** Copyright (C) 2023 Ivan Komissarov (abbapoh@gmail.com)
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qbs.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#pragma once
+
+#include <shared_mutex>
+
+namespace qbs {
+namespace Internal {
+
+// adapted version of https://github.com/dragazo/rustex/blob/master/rustex.h
+
+// a data with a mutually exclusive access
+template<typename DataType, typename MutexType = std::shared_mutex>
+class MutexData
+{
+public:
+ template<typename T, template<typename> typename LockType>
+ class ReferenceGuard
+ {
+ friend class MutexData;
+ template<typename U>
+ ReferenceGuard(U &&data) noexcept
+ : m_ptr(std::addressof(data.m_data))
+ , m_lock(data.m_mutex)
+ {}
+ public:
+ ReferenceGuard(const ReferenceGuard &) = delete;
+ ReferenceGuard(ReferenceGuard &&) = default;
+ ReferenceGuard &operator=(const ReferenceGuard &) = delete;
+ ReferenceGuard &operator=(ReferenceGuard &&) = default;
+
+ T &get() const noexcept { return *m_ptr; }
+ T &data() const noexcept { return *m_ptr; }
+ operator T &() const noexcept { return *m_ptr; }
+
+ private:
+ T *m_ptr;
+ LockType<MutexType> m_lock;
+ };
+
+ using UniqueMutableGuard = ReferenceGuard<DataType, std::unique_lock>;
+ using UniqueConstGuard = ReferenceGuard<const DataType, std::unique_lock>;
+ using SharedGuard = ReferenceGuard<const DataType, std::shared_lock>;
+
+ template<
+ typename ...Args,
+ std::enable_if_t<std::is_constructible_v<DataType, Args...>, int> = 0
+ >
+ explicit MutexData(Args &&...args) : m_data(std::forward<Args>(args)...) {}
+
+ [[nodiscard]] UniqueMutableGuard lock() noexcept { return UniqueMutableGuard{*this}; }
+ [[nodiscard]] UniqueConstGuard lock() const noexcept { return UniqueConstGuard{*this}; }
+
+ template<
+ typename U = MutexType,
+ std::enable_if_t<std::is_same_v<U, std::shared_mutex>, int> = 0
+ >
+ [[nodiscard]] SharedGuard lock_shared() const noexcept
+ { return SharedGuard{*this}; }
+
+private:
+ DataType m_data;
+ mutable MutexType m_mutex;
+};
+
+} // namespace qbs
+} // namespace Internal