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File indexing completed on 2025-01-18 10:07:14
0001 // Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com> 0002 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only 0003 #ifndef Q20FUNCTIONAL_H 0004 #define Q20FUNCTIONAL_H 0005 0006 #include <QtCore/qglobal.h> 0007 0008 #include <functional> 0009 0010 // 0011 // W A R N I N G 0012 // ------------- 0013 // 0014 // This file is not part of the Qt API. Types and functions defined in this 0015 // file can reliably be replaced by their std counterparts, once available. 0016 // You may use these definitions in your own code, but be aware that we 0017 // will remove them once Qt depends on the C++ version that supports 0018 // them in namespace std. There will be NO deprecation warning, the 0019 // definitions will JUST go away. 0020 // 0021 // If you can't agree to these terms, don't use these definitions! 0022 // 0023 // We mean it. 0024 // 0025 0026 #include <functional> 0027 0028 QT_BEGIN_NAMESPACE 0029 0030 namespace q20 { 0031 // like std::identity 0032 #ifdef __cpp_lib_ranges 0033 using std::identity; 0034 #else 0035 struct identity 0036 { 0037 struct is_transparent {}; 0038 template <typename T> 0039 constexpr T &&operator()(T&& t) const noexcept { return std::forward<T>(t); } 0040 }; 0041 #endif // __cpp_lib_ranges 0042 } // namespace q20 0043 0044 QT_END_NAMESPACE 0045 0046 #endif /* Q20FUNCTIONAL_H */
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