| 1 | // Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com> |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | #ifndef Q20TYPE_TRAITS_H |
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| 4 | #define Q20TYPE_TRAITS_H |
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| 5 | |
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| 6 | #include <QtCore/qtconfigmacros.h> |
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| 7 | |
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| 8 | // |
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| 9 | // W A R N I N G |
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| 10 | // ------------- |
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| 11 | // |
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| 12 | // This file is not part of the Qt API. Types and functions defined in this |
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| 13 | // file can reliably be replaced by their std counterparts, once available. |
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| 14 | // You may use these definitions in your own code, but be aware that we |
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| 15 | // will remove them once Qt depends on the C++ version that supports |
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| 16 | // them in namespace std. There will be NO deprecation warning, the |
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| 17 | // definitions will JUST go away. |
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| 18 | // |
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| 19 | // If you can't agree to these terms, don't use these definitions! |
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| 20 | // |
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| 21 | // We mean it. |
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| 22 | // |
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| 23 | |
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| 24 | #include <type_traits> |
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| 25 | |
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| 26 | QT_BEGIN_NAMESPACE |
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| 27 | |
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| 28 | namespace q20 { |
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| 29 | // like std::remove_cvref(_t) |
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| 30 | #ifdef __cpp_lib_remove_cvref |
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| 31 | using std::remove_cvref; |
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| 32 | using std::remove_cvref_t; |
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| 33 | #else |
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| 34 | template <typename T> |
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| 35 | using remove_cvref = std::remove_cv<std::remove_reference_t<T>>; |
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| 36 | template <typename T> |
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| 37 | using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>; |
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| 38 | #endif // __cpp_lib_remove_cvref |
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| 39 | } |
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| 40 | |
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| 41 | namespace q20 { |
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| 42 | // like std::type_identity(_t) |
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| 43 | #ifdef __cpp_lib_type_identity |
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| 44 | using std::type_identity; |
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| 45 | using std::type_identity_t; |
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| 46 | #else |
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| 47 | template <typename T> |
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| 48 | struct type_identity { using type = T; }; |
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| 49 | template <typename T> |
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| 50 | using type_identity_t = typename type_identity<T>::type; |
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| 51 | #endif // __cpp_lib_type_identity |
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| 52 | } |
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| 53 | |
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| 54 | QT_END_NAMESPACE |
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| 55 | |
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| 56 | #endif /* Q20TYPE_TRAITS_H */ |
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| 57 | |
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