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45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
// Copyright (C) 2021 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 Q20ITERATOR_H
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#define Q20ITERATOR_H
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#include <QtCore/qglobal.h>
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#include <iterator>
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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::ssize
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namespace q20 {
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#ifdef __cpp_lib_ssize
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using std::ssize;
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#else
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template<class C> constexpr auto ssize(const C &c)
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-> std::common_type_t<std::ptrdiff_t, std::make_signed_t<decltype(c.size())>>
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{ return static_cast<std::common_type_t<std::ptrdiff_t, std::make_signed_t<decltype(c.size())>>>(c.size()); }
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template<class T, std::ptrdiff_t N> constexpr std::ptrdiff_t ssize(const T (&)[N]) noexcept
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{ return N; }
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#endif
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} // namespace q20
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QT_END_NAMESPACE
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#endif /* Q20ITERATOR_H */
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