| 1 | // Copyright (C) 2024 The Qt Company Ltd. |
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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 Q17MEMORY_H |
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| 4 | #define Q17MEMORY_H |
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| 5 | |
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| 6 | #include <QtCore/qexceptionhandling.h> |
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| 7 | #include <QtCore/qtconfigmacros.h> |
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| 8 | |
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| 9 | #include <iterator> |
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| 10 | #include <memory> |
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| 11 | |
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| 12 | QT_BEGIN_NAMESPACE |
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| 13 | |
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| 14 | namespace q17 { |
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| 15 | // like std::uninitialized_value_construct |
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| 16 | #if !defined(Q_OS_VXWORKS) |
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| 17 | using std::uninitialized_value_construct; |
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| 18 | #else |
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| 19 | namespace _detail { |
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| 20 | template <typename T> |
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| 21 | void *voidify(T &t) { |
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| 22 | // LWG3870 changed this for C++23, but this is q_17_, so use the C++17/20 version: |
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| 23 | return const_cast<void*>(static_cast<const volatile void*>(std::addressof(t))); |
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| 24 | } |
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| 25 | } // namespace _detail |
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| 26 | // WindRiver confirmed that implementation of `std::uninitialized_value_construct` is not |
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| 27 | // working properly in VxWorks 24.03 (probably the same problem appears in older versions) with |
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| 28 | // defect VXHVP-9969 |
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| 29 | template <typename ForwardIt> |
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| 30 | void uninitialized_value_construct(ForwardIt first, ForwardIt last) |
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| 31 | { |
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| 32 | auto current = first; |
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| 33 | using ValueType = typename std::iterator_traits<ForwardIt>::value_type; |
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| 34 | QT_TRY { |
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| 35 | for (; current != last; ++current) |
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| 36 | ::new (_detail::voidify(*current)) ValueType(); |
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| 37 | } QT_CATCH(...) { |
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| 38 | std::destroy(first, current); |
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| 39 | QT_RETHROW; |
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| 40 | } |
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| 41 | } |
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| 42 | #endif // Q_OS_VXWORKS |
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| 43 | } // namespace q17 |
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| 44 | |
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| 45 | QT_END_NAMESPACE |
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| 46 | |
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| 47 | #endif // Q17MEMORY_H |
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| 48 | |
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