blob: 1efb24bf70fd13150c2ad324b4dcc0fdaa16df24 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// 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 <QtCore/qtdeprecationmarkers.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);
}
#ifndef QT_NO_QASCONST
#if QT_DEPRECATED_SINCE(6, 6)
// this adds const to non-const objects (like std::as_const)
template <typename T>
QT_DEPRECATED_VERSION_X_6_6("Use std::as_const() instead.")
constexpr typename std::add_const<T>::type &qAsConst(T &t) noexcept { return t; }
// prevent rvalue arguments:
template <typename T>
void qAsConst(const T &&) = delete;
#endif // QT_DEPRECATED_SINCE(6, 6)
#endif // QT_NO_QASCONST
#ifndef QT_NO_QEXCHANGE
// 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;
}
#endif // QT_NO_QEXCHANGE
namespace QtPrivate {
// helper to be used to trigger a "dependent static_assert(false)"
// (for instance, in a final `else` branch of a `if constexpr`.)
template <typename T> struct type_dependent_false : std::false_type {};
template <auto T> struct value_dependent_false : std::false_type {};
}
QT_END_NAMESPACE
#endif // QTTYPETRAITS_H
|
