libquentier 0.5.0
The library for rich desktop clients of Evernote service
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Compat.h
1/*
2 * Copyright 2020 Dmitry Ivanov
3 *
4 * This file is part of libquentier
5 *
6 * libquentier is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation, version 3 of the License.
9 *
10 * libquentier is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with libquentier. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#ifndef LIB_QUENTIER_UTILITY_COMPAT_H
20#define LIB_QUENTIER_UTILITY_COMPAT_H
21
22#include <QHash>
23#include <QString>
24#include <QtGlobal>
25
26#if QT_VERSION < QT_VERSION_CHECK(5, 7, 0)
27#include <type_traits>
28#endif
29
30// Compatibility with older Qt versions
31
32#if QT_VERSION < QT_VERSION_CHECK(5, 7, 0)
33
34// this adds const to non-const objects (like std::as_const)
35template <typename T>
36Q_DECL_CONSTEXPR typename std::add_const<T>::type & qAsConst(T & t)
37 Q_DECL_NOTHROW
38{
39 return t;
40}
41
42// prevent rvalue arguments:
43template <typename T>
44void qAsConst(const T &&) = delete;
45
46#endif
47
48// Compatibility with boost parts which require to take a hash of QString
49
50inline std::size_t hash_value(QString x) noexcept
51{
52 return qHash(x);
53}
54
55#endif // LIB_QUENTIER_UTILITY_COMPAT_H