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qmakearray_p.h
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1// Copyright (C) 2020 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QMAKEARRAY_P_H
5#define QMAKEARRAY_P_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists purely as an
12// implementation detail. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include "QtCore/private/qglobal_p.h"
19
20#include <array>
21#include <type_traits>
22#include <utility>
23
24QT_BEGIN_NAMESPACE
25
26namespace QtPrivate {
27template<typename T>
28constexpr T &&Forward(typename std::remove_reference<T>::type &t) noexcept
29{
30 return static_cast<T &&>(t);
31}
32
33template<typename T>
34constexpr T &&Forward(typename std::remove_reference<T>::type &&t) noexcept
35{
36 static_assert(!std::is_lvalue_reference<T>::value,
37 "template argument substituting T is an lvalue reference type");
38 return static_cast<T &&>(t);
39}
40
41template <typename ManualType, typename ...>
42struct ArrayTypeHelper
43{
44 using type = ManualType;
45};
46
47template <typename ... Types>
48struct ArrayTypeHelper<void, Types...> : std::common_type<Types...> { };
49
50template <typename ManualType, typename... Types>
51using ArrayType = std::array<typename ArrayTypeHelper<ManualType, Types...>::type,
52 sizeof...(Types)>;
53
54template<typename ... Values>
55struct QuickSortData { };
56
57template <template <typename> class Predicate,
58 typename ... Values>
59struct QuickSortFilter;
60
61template <typename ... Right, typename ... Left>
62constexpr QuickSortData<Right..., Left...> quickSortConcat(
63 QuickSortData<Right...>, QuickSortData<Left...>) noexcept;
64
65template<typename ... Right, typename Middle, typename ... Left>
66constexpr QuickSortData<Right..., Middle, Left...> quickSortConcat(
67 QuickSortData<Right...>,
68 QuickSortData<Middle>,
69 QuickSortData<Left...>) noexcept;
70
71template <template <typename> class Predicate,
72 typename Head, typename ... Tail>
73struct QuickSortFilter<Predicate, QuickSortData<Head, Tail...>>
74{
75 using TailFilteredData = typename QuickSortFilter<
76 Predicate, QuickSortData<Tail...>>::Type;
77
78 using Type = typename std::conditional<
79 Predicate<Head>::value,
80 decltype(quickSortConcat(QuickSortData<Head> {}, TailFilteredData{})),
81 TailFilteredData>::type;
82};
83
84template <template <typename> class Predicate>
85struct QuickSortFilter<Predicate, QuickSortData<>>
86{
87 using Type = QuickSortData<>;
88};
89
90template <typename ... Values>
91struct QuickSort;
92
93template <typename Pivot, typename ... Values>
94struct QuickSort<QuickSortData<Pivot, Values...>>
95{
96 template <typename Left>
97 struct LessThan {
98 static constexpr const bool value = Left::data() <= Pivot::data();
99 };
100
101 template <typename Left>
102 struct MoreThan {
103 static constexpr const bool value = !(Left::data() <= Pivot::data());
104 };
105
106 using LeftSide = typename QuickSortFilter<LessThan, QuickSortData<Values...>>::Type;
107 using RightSide = typename QuickSortFilter<MoreThan, QuickSortData<Values...>>::Type;
108
109 using LeftQS = typename QuickSort<LeftSide>::Type;
110 using RightQS = typename QuickSort<RightSide>::Type;
111
112 using Type = decltype(quickSortConcat(LeftQS{}, QuickSortData<Pivot> {}, RightQS{}));
113
114};
115
116template <>
117struct QuickSort<QuickSortData<>>
118{
119 using Type = QuickSortData<>;
120};
121} // namespace QtPrivate
122
123template <typename ManualType = void, typename ... Types>
124constexpr QtPrivate::ArrayType<ManualType, Types...> qMakeArray(Types && ... t) noexcept
125{
126 return {{QtPrivate::Forward<typename QtPrivate::ArrayType<ManualType, Types...>::value_type>(t)...}};
127}
128
129template<typename ... Values>
130struct QSortedData {
131 using Data = typename QtPrivate::QuickSort<typename QtPrivate::QuickSortData<Values...>>::Type;
132};
133
134template<typename ... Values>
135constexpr auto qMakeArray(QtPrivate::QuickSortData<Values...>) noexcept -> decltype(qMakeArray(Values::data()...))
136{
137 return qMakeArray(Values::data() ...);
138}
139
140
141QT_END_NAMESPACE
142
143#endif // QMAKEARRAY_P_H
QT_BEGIN_NAMESPACE
Combined button and popup list for selecting options.
Definition qstandardpaths_haiku.cpp:21
QT_END_NAMESPACE
Definition qsharedpointer.cpp:1545
QtPrivate
\macro QT_NAMESPACE
Definition qtconcurrentcompilertest.h:13
QtPrivate::Forward
constexpr T && Forward(typename std::remove_reference< T >::type &t) noexcept
Definition qmakearray_p.h:28
QtPrivate::ArrayType
std::array< typename ArrayTypeHelper< ManualType, Types... >::type, sizeof...(Types)> ArrayType
Definition qmakearray_p.h:52
QtPrivate::quickSortConcat
constexpr QuickSortData< Right..., Left... > quickSortConcat(QuickSortData< Right... >, QuickSortData< Left... >) noexcept
void
DBusConnection const char DBusError DBusBusType DBusError return DBusConnection DBusHandleMessageFunction void DBusFreeFunction return DBusConnection return DBusConnection return const char DBusError return DBusConnection DBusMessage dbus_uint32_t return DBusConnection dbus_bool_t DBusConnection DBusAddWatchFunction DBusRemoveWatchFunction DBusWatchToggledFunction void DBusFreeFunction return DBusConnection DBusDispatchStatusFunction void DBusFreeFunction DBusTimeout return DBusTimeout return DBusWatch return DBusWatch unsigned int return DBusError const DBusError return const DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessageIter int const void return DBusMessageIter DBusMessageIter return DBusMessageIter void DBusMessageIter void int return DBusMessage DBusMessageIter return DBusMessageIter return DBusMessageIter DBusMessageIter const char const char const char const char return DBusMessage return DBusMessage const char return DBusMessage dbus_bool_t return DBusMessage dbus_uint32_t return DBusMessage void
Definition qdbus_symbols_p.h:401
value
EGLOutputLayerEXT EGLint EGLAttrib value
[5]
Definition qeglstreamconvenience_p.h:46
qMakeArray
constexpr QtPrivate::ArrayType< ManualType, Types... > qMakeArray(Types &&... t) noexcept
Definition qmakearray_p.h:124
type
GLenum type
Definition qopengles2ext.h:150
t
GLdouble GLdouble t
Definition qopenglext.h:243
Left
@ Left
Definition qpainterpath.cpp:1849
Right
@ Right
Definition qpainterpath.cpp:1849
QSortedData::Data
typename QtPrivate::QuickSort< typename QtPrivate::QuickSortData< Values... > >::Type Data
Definition qmakearray_p.h:131
QtPrivate::QuickSortFilter< Predicate, QuickSortData< Head, Tail... > >::TailFilteredData
typename QuickSortFilter< Predicate, QuickSortData< Tail... > >::Type TailFilteredData
Definition qmakearray_p.h:76
QtPrivate::QuickSort< QuickSortData< Pivot, Values... > >::LeftSide
typename QuickSortFilter< LessThan, QuickSortData< Values... > >::Type LeftSide
Definition qmakearray_p.h:106
QtPrivate::QuickSort< QuickSortData< Pivot, Values... > >::RightSide
typename QuickSortFilter< MoreThan, QuickSortData< Values... > >::Type RightSide
Definition qmakearray_p.h:107
QtPrivate::QuickSort< QuickSortData< Pivot, Values... > >::RightQS
typename QuickSort< RightSide >::Type RightQS
Definition qmakearray_p.h:110
Type
Definition moc.h:24