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++ // Copyright (C) 2024 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 Q26NUMERIC_H
++ #define Q26NUMERIC_H
++
++ #include <QtCore/qglobal.h>
++
++ //
++ // 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.
++ //
++
++ #include <numeric>
++ #include <limits>
++ #include <type_traits>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace q26 {
++
++ // Like std::saturating_cast
++ #if defined(__cpp_lib_saturation_arithmetic) && __cpp_lib_saturation_arithmetic >= 202603L
++ using std::saturating_cast;
++ #else
++ template <typename To, typename From>
++ constexpr auto saturating_cast(From x)
++ {
++ static_assert(std::is_integral_v<To>);
++ static_assert(std::is_integral_v<From>);
++
++ [[maybe_unused]]
++ constexpr auto Lo = (std::numeric_limits<To>::min)();
++ constexpr auto Hi = (std::numeric_limits<To>::max)();
++
++ if constexpr (std::is_signed_v<From> == std::is_signed_v<To>) {
++ // same signedness, we can accept regular integer conversion rules
++ return x < Lo ? Lo :
++ x > Hi ? Hi :
++ /*else*/ To(x);
++ } else {
++ if constexpr (std::is_signed_v<From>) { // ie. !is_signed_v<To>
++ if (x < From{0})
++ return To{0};
++ }
++
++ // from here on, x >= 0
++ using FromU = std::make_unsigned_t<From>;
++ using ToU = std::make_unsigned_t<To>;
++ return FromU(x) > ToU(Hi) ? Hi : To(x); // assumes Hi >= 0
++ }
++ }
++ #endif // __cpp_lib_saturation_arithmetic
++
++ template <typename To, typename From>
++ constexpr auto saturate_cast(From x)
++ {
++ return q26::saturating_cast<To>(x);
++ }
++
++ } // namespace q26
++
++ QT_END_NAMESPACE
++
++ #endif /* Q26NUMERIC_H */