Revision control
++ // Copyright (C) 2021 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++ #ifndef Q20ITERATOR_H
++ #define Q20ITERATOR_H
++
++ #include <QtCore/qglobal.h>
++
++ #include <iterator>
++
++ //
++ // W A R N I N G
++ // -------------
++ //
++ // This file is not part of the Qt API. Types and functions defined in this
++ // file can reliably be replaced by their std counterparts, once available.
++ // You may use these definitions in your own code, but be aware that we
++ // will remove them once Qt depends on the C++ version that supports
++ // them in namespace std. There will be NO deprecation warning, the
++ // definitions will JUST go away.
++ //
++ // If you can't agree to these terms, don't use these definitions!
++ //
++ // We mean it.
++ //
++
++ QT_BEGIN_NAMESPACE
++
++ // like std::ssize
++ namespace q20 {
++ #ifdef __cpp_lib_ssize
++ using std::ssize;
++ #else
++ template<class C> constexpr auto ssize(const C &c)
++ -> std::common_type_t<std::ptrdiff_t, std::make_signed_t<decltype(c.size())>>
++ { return static_cast<std::common_type_t<std::ptrdiff_t, std::make_signed_t<decltype(c.size())>>>(c.size()); }
++
++ template<class T, std::ptrdiff_t N> constexpr std::ptrdiff_t ssize(const T (&)[N]) noexcept
++ { return N; }
++ #endif
++ } // namespace q20
++
++ // like std::iter_reference_t
++ namespace q20 {
++ #ifdef __cpp_lib_ranges
++ using std::iter_reference_t;
++ #else
++ template <typename Dereferencable> // unconstrained (constraint requires concepts)
++ using iter_reference_t = decltype(*std::declval<Dereferencable&>());
++ #endif // __cpp_lib_ranges
++ } // namespace q20
++
++ QT_END_NAMESPACE
++
++ #endif /* Q20ITERATOR_H */