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// Copyright (C) 2020 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 QMAKEARRAY_P_H
#define QMAKEARRAY_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "QtCore/private/qglobal_p.h"
#include <array>
#include <type_traits>
#include <utility>
QT_BEGIN_NAMESPACE
namespace QtPrivate {
template<typename T>
constexpr T &&Forward(typename std::remove_reference<T>::type &t) noexcept
{
return static_cast<T &&>(t);
}
template<typename T>
constexpr T &&Forward(typename std::remove_reference<T>::type &&t) noexcept
{
static_assert(!std::is_lvalue_reference<T>::value,
"template argument substituting T is an lvalue reference type");
return static_cast<T &&>(t);
}
template <typename ManualType, typename ...>
struct ArrayTypeHelper
{
using type = ManualType;
};
template <typename ... Types>
struct ArrayTypeHelper<void, Types...> : std::common_type<Types...> { };
template <typename ManualType, typename... Types>
using ArrayType = std::array<typename ArrayTypeHelper<ManualType, Types...>::type,
sizeof...(Types)>;
template<typename ... Values>
struct QuickSortData { };
template <template <typename> class Predicate,
typename ... Values>
struct QuickSortFilter;
template <typename ... Right, typename ... Left>
constexpr QuickSortData<Right..., Left...> quickSortConcat(
QuickSortData<Right...>, QuickSortData<Left...>) noexcept;
template<typename ... Right, typename Middle, typename ... Left>
constexpr QuickSortData<Right..., Middle, Left...> quickSortConcat(
QuickSortData<Right...>,
QuickSortData<Middle>,
QuickSortData<Left...>) noexcept;
template <template <typename> class Predicate,
typename Head, typename ... Tail>
struct QuickSortFilter<Predicate, QuickSortData<Head, Tail...>>
{
using TailFilteredData = typename QuickSortFilter<
Predicate, QuickSortData<Tail...>>::Type;
using Type = typename std::conditional<
Predicate<Head>::value,
decltype(quickSortConcat(QuickSortData<Head> {}, TailFilteredData{})),
TailFilteredData>::type;
};
template <template <typename> class Predicate>
struct QuickSortFilter<Predicate, QuickSortData<>>
{
using Type = QuickSortData<>;
};
template <typename ... Values>
struct QuickSort;
template <typename Pivot, typename ... Values>
struct QuickSort<QuickSortData<Pivot, Values...>>
{
template <typename Left>
struct LessThan {
static constexpr const bool value = Left::data() <= Pivot::data();
};
template <typename Left>
struct MoreThan {
static constexpr const bool value = !(Left::data() <= Pivot::data());
};
using LeftSide = typename QuickSortFilter<LessThan, QuickSortData<Values...>>::Type;
using RightSide = typename QuickSortFilter<MoreThan, QuickSortData<Values...>>::Type;
using LeftQS = typename QuickSort<LeftSide>::Type;
using RightQS = typename QuickSort<RightSide>::Type;
using Type = decltype(quickSortConcat(LeftQS{}, QuickSortData<Pivot> {}, RightQS{}));
};
template <>
struct QuickSort<QuickSortData<>>
{
using Type = QuickSortData<>;
};
} // namespace QtPrivate
template <typename ManualType = void, typename ... Types>
constexpr QtPrivate::ArrayType<ManualType, Types...> qMakeArray(Types && ... t) noexcept
{
return {{QtPrivate::Forward<typename QtPrivate::ArrayType<ManualType, Types...>::value_type>(t)...}};
}
template<typename ... Values>
struct QSortedData {
using Data = typename QtPrivate::QuickSort<typename QtPrivate::QuickSortData<Values...>>::Type;
};
template<typename ... Values>
constexpr auto qMakeArray(QtPrivate::QuickSortData<Values...>) noexcept -> decltype(qMakeArray(Values::data()...))
{
return qMakeArray(Values::data() ...);
}
QT_END_NAMESPACE
#endif // QMAKEARRAY_P_H
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