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51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
// Copyright (C) 2023 The Qt Company Ltd.
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// 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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#ifndef Q20MEMORY_H
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#define Q20MEMORY_H
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#include <QtCore/qtconfigmacros.h>
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#include <memory>
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#include <utility>
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#include <type_traits>
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. Types and functions defined in this
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// file can reliably be replaced by their std counterparts, once available.
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// You may use these definitions in your own code, but be aware that we
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// will remove them once Qt depends on the C++ version that supports
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// them in namespace std. There will be NO deprecation warning, the
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// definitions will JUST go away.
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//
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// If you can't agree to these terms, don't use these definitions!
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//
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// We mean it.
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//
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QT_BEGIN_NAMESPACE
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// like std::construct_at (but not whitelisted for constexpr)
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namespace q20 {
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#ifdef __cpp_lib_constexpr_dynamic_alloc
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using std::construct_at;
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#else
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template <typename T,
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typename... Args,
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typename Enable = std::void_t<decltype(::new (std::declval<void *>()) T(std::declval<Args>()...))> >
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T *construct_at(T *ptr, Args && ... args)
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{
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return ::new (const_cast<void *>(static_cast<const volatile void *>(ptr)))
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T(std::forward<Args>(args)...);
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}
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#endif // __cpp_lib_constexpr_dynamic_alloc
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} // namespace q20
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QT_END_NAMESPACE
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#endif /* Q20MEMORY_H */
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