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6** This file is part of the QtConcurrent module of the Qt Toolkit.
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38****************************************************************************/
39
40#ifndef QTCONCURRENT_FUNCTIONWRAPPERS_H
41#define QTCONCURRENT_FUNCTIONWRAPPERS_H
42
43#include <QtConcurrent/qtconcurrentcompilertest.h>
44#include <QtCore/QStringList>
45
46#include <tuple>
47
48#if !defined(QT_NO_CONCURRENT) || defined(Q_CLANG_QDOC)
49
50QT_BEGIN_NAMESPACE
51
52namespace QtPrivate {
53
54struct PushBackWrapper
55{
56 template <class C, class U>
57 inline void operator()(C &c, const U &u) const
58 {
59 return c.push_back(u);
60 }
61
62 template <class C, class U>
63 inline void operator()(C &c, U &&u) const
64 {
65 return c.push_back(u);
66 }
67};
68
69// -- MapResultType
70
71template <class T, class Enable = void>
72struct Argument
73{
74 using Type = void;
75};
76
77template <class Sequence>
78struct Argument<Sequence, typename std::enable_if<IsIterableValue<Sequence>>::type>
79{
80 using Type = std::decay_t<decltype(*std::declval<Sequence>().begin())>;
81};
82
83template <class Iterator>
84struct Argument<Iterator, typename std::enable_if<IsDereferenceableValue<Iterator>>::type>
85{
86 using Type = std::decay_t<decltype(*std::declval<Iterator>())>;
87};
88
89template <class T>
90using ArgumentType = typename Argument<T>::Type;
91
92template <class T, class MapFunctor>
93struct MapResult
94{
95 static_assert(std::is_invocable_v<std::decay_t<MapFunctor>, ArgumentType<T>>,
96 "It's not possible to invoke the function with passed argument.");
97 using Type = std::invoke_result_t<std::decay_t<MapFunctor>, ArgumentType<T>>;
98};
99
100template <class T, class MapFunctor>
101using MapResultType = typename MapResult<T, MapFunctor>::Type;
102
103// -- ReduceResultType
104
105template <class T>
106struct ReduceResultType;
107
108template <class U, class V>
109struct ReduceResultType<void(*)(U&,V)>
110{
111 using ResultType = U;
112};
113
114template <class T, class C, class U>
115struct ReduceResultType<T(C::*)(U)>
116{
117 using ResultType = C;
118};
119
120template <class U, class V>
121struct ReduceResultType<std::function<void(U&, V)>>
122{
123 using ResultType = U;
124};
125
126template <typename R, typename ...A>
127struct ReduceResultType<R(*)(A...)>
128{
129 using ResultType = typename std::tuple_element<0, std::tuple<A...>>::type;
130};
131
132#if defined(__cpp_noexcept_function_type) && __cpp_noexcept_function_type >= 201510
133template <class U, class V>
134struct ReduceResultType<void(*)(U&,V) noexcept>
135{
136 using ResultType = U;
137};
138
139template <class T, class C, class U>
140struct ReduceResultType<T(C::*)(U) noexcept>
141{
142 using ResultType = C;
143};
144#endif
145
146// -- MapSequenceResultType
147
148template <class InputSequence, class MapFunctor>
149struct MapSequenceResultType;
150
151template <class MapFunctor>
152struct MapSequenceResultType<QStringList, MapFunctor>
153{
154 typedef QList<QtPrivate::MapResultType<QStringList, MapFunctor>> ResultType;
155};
156
157#ifndef QT_NO_TEMPLATE_TEMPLATE_PARAMETERS
158
159template <template <typename...> class InputSequence, typename MapFunctor, typename ...T>
160struct MapSequenceResultType<InputSequence<T...>, MapFunctor>
161{
162 typedef InputSequence<QtPrivate::MapResultType<InputSequence<T...>, MapFunctor>> ResultType;
163};
164
165#endif // QT_NO_TEMPLATE_TEMPLATE_PARAMETER
166
167template<typename Sequence>
168struct SequenceHolder
169{
170 SequenceHolder(const Sequence &s) : sequence(s) { }
171 SequenceHolder(Sequence &&s) : sequence(std::move(s)) { }
172 Sequence sequence;
173};
174
175} // namespace QtPrivate.
176
177
178QT_END_NAMESPACE
179
180#endif // QT_NO_CONCURRENT
181
182#endif
183