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40
41#if 0
42#pragma qt_sync_skip_header_check
43#pragma qt_sync_stop_processing
44#endif
45
46#ifndef QCONTAINERTOOLS_IMPL_H
47#define QCONTAINERTOOLS_IMPL_H
48
49#include <QtCore/qglobal.h>
50#include <iterator>
51
52QT_BEGIN_NAMESPACE
53
54namespace QtPrivate
55{
56template <typename Iterator>
57using IfIsInputIterator = typename std::enable_if<
58 std::is_convertible<typename std::iterator_traits<Iterator>::iterator_category, std::input_iterator_tag>::value,
59 bool>::type;
60
61template <typename Iterator>
62using IfIsForwardIterator = typename std::enable_if<
63 std::is_convertible<typename std::iterator_traits<Iterator>::iterator_category, std::forward_iterator_tag>::value,
64 bool>::type;
65
66template <typename Iterator>
67using IfIsNotForwardIterator = typename std::enable_if<
68 !std::is_convertible<typename std::iterator_traits<Iterator>::iterator_category, std::forward_iterator_tag>::value,
69 bool>::type;
70
71template <typename Container,
72 typename InputIterator,
73 IfIsNotForwardIterator<InputIterator> = true>
74void reserveIfForwardIterator(Container *, InputIterator, InputIterator)
75{
76}
77
78template <typename Container,
79 typename ForwardIterator,
80 IfIsForwardIterator<ForwardIterator> = true>
81void reserveIfForwardIterator(Container *c, ForwardIterator f, ForwardIterator l)
82{
83 c->reserve(static_cast<typename Container::size_type>(std::distance(f, l)));
84}
85
86// for detecting expression validity
87template <typename ... T>
88using void_t = void;
89
90template <typename Iterator, typename = void_t<>>
91struct AssociativeIteratorHasKeyAndValue : std::false_type
92{
93};
94
95template <typename Iterator>
96struct AssociativeIteratorHasKeyAndValue<
97 Iterator,
98 void_t<decltype(std::declval<Iterator &>().key()),
99 decltype(std::declval<Iterator &>().value())>
100 >
101 : std::true_type
102{
103};
104
105template <typename Iterator, typename = void_t<>, typename = void_t<>>
106struct AssociativeIteratorHasFirstAndSecond : std::false_type
107{
108};
109
110template <typename Iterator>
111struct AssociativeIteratorHasFirstAndSecond<
112 Iterator,
113 void_t<decltype(std::declval<Iterator &>()->first),
114 decltype(std::declval<Iterator &>()->second)>
115 >
116 : std::true_type
117{
118};
119
120template <typename Iterator>
121using IfAssociativeIteratorHasKeyAndValue =
122 typename std::enable_if<AssociativeIteratorHasKeyAndValue<Iterator>::value, bool>::type;
123
124template <typename Iterator>
125using IfAssociativeIteratorHasFirstAndSecond =
126 typename std::enable_if<AssociativeIteratorHasFirstAndSecond<Iterator>::value, bool>::type;
127
128} // namespace QtPrivate
129
130QT_END_NAMESPACE
131
132#endif // QCONTAINERTOOLS_IMPL_H
133

source code of qtbase/src/corelib/tools/qcontainertools_impl.h