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++ // Copyright (C) 2022 The Qt Company Ltd.
++ // 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 Q23FUNCTIONAL_H
++ #define Q23FUNCTIONAL_H
++
++ #include <QtCore/qglobal.h>
++ #include <QtCore/q20functional.h>
++
++ //
++ // 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.
++ //
++
++ QT_BEGIN_NAMESPACE
++
++ namespace q23 {
++ // like std::invoke_r
++ #ifdef __cpp_lib_invoke_r
++ using std::invoke_r;
++ #else
++ template <typename R, typename F, typename...Args>
++ constexpr
++ std::enable_if_t<std::is_invocable_r_v<R, F, Args...>, R>
++ invoke_r(F&& f, Args&&... args)
++ noexcept(std::is_nothrow_invocable_r_v<R, F, Args...>)
++ {
++ // ### use q20::invoke for a constexpr std::invoke
++ if constexpr (std::is_void_v<R>)
++ std::invoke(std::forward<F>(f), std::forward<Args>(args)...);
++ else
++ return std::invoke(std::forward<F>(f), std::forward<Args>(args)...);
++ }
++ #endif // __cpp_lib_invoke_r
++ } // namespace q23
++
++ QT_END_NAMESPACE
++
++ #endif /* Q23FUNCTIONAL_H */