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// Copyright (C) 2022 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
#ifndef QTTYPETRAITS_H
#define QTTYPETRAITS_H
#include <QtCore/qtconfigmacros.h>
#include <type_traits>
#include <utility>
#if 0
#pragma qt_class(QtTypeTraits)
#pragma qt_sync_stop_processing
#endif
QT_BEGIN_NAMESPACE
// like std::to_underlying
template <typename Enum>
constexpr std::underlying_type_t<Enum> qToUnderlying(Enum e) noexcept
{
return static_cast<std::underlying_type_t<Enum>>(e);
}
// this adds const to non-const objects (like std::as_const)
template <typename T>
constexpr typename std::add_const<T>::type &qAsConst(T &t) noexcept { return t; }
// prevent rvalue arguments:
template <typename T>
void qAsConst(const T &&) = delete;
// like std::exchange
template <typename T, typename U = T>
constexpr T qExchange(T &t, U &&newValue)
noexcept(std::conjunction_v<std::is_nothrow_move_constructible<T>,
std::is_nothrow_assignable<T &, U>>)
{
T old = std::move(t);
t = std::forward<U>(newValue);
return old;
}
QT_END_NAMESPACE
#endif // QTTYPETRAITS_H
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