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++ // Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com>
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++ #ifndef Q20FUNCTIONAL_H
++ #define Q20FUNCTIONAL_H
++
++ #include <QtCore/qglobal.h>
++
++ #include <functional>
++
++ //
++ // W A R N I N G
++ // -------------
++ //
++ // This file is not part of the Qt API. Types and functions defined in this
++ // file can reliably be replaced by their std counterparts, once available.
++ // You may use these definitions in your own code, but be aware that we
++ // will remove them once Qt depends on the C++ version that supports
++ // them in namespace std. There will be NO deprecation warning, the
++ // definitions will JUST go away.
++ //
++ // If you can't agree to these terms, don't use these definitions!
++ //
++ // We mean it.
++ //
++
++ #include <functional>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace q20 {
++ // like std::identity
++ #ifdef __cpp_lib_ranges
++ using std::identity;
++ #else
++ struct identity
++ {
++ struct is_transparent {};
++ template <typename T>
++ constexpr T &&operator()(T&& t) const noexcept { return std::forward<T>(t); }
++ };
++ #endif // __cpp_lib_ranges
++ } // namespace q20
++
++ QT_END_NAMESPACE
++
++ #endif /* Q20FUNCTIONAL_H */