133 lines
4.7 KiB
C++
133 lines
4.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com>
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** Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#if 0
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#pragma qt_sync_skip_header_check
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#pragma qt_sync_stop_processing
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#endif
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#ifndef QCONTAINERTOOLS_IMPL_H
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#define QCONTAINERTOOLS_IMPL_H
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#include <QtCore/qglobal.h>
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#include <iterator>
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QT_BEGIN_NAMESPACE
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namespace QtPrivate
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{
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template <typename Iterator>
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using IfIsInputIterator = typename std::enable_if<
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std::is_convertible<typename std::iterator_traits<Iterator>::iterator_category, std::input_iterator_tag>::value,
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bool>::type;
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template <typename Iterator>
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using IfIsForwardIterator = typename std::enable_if<
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std::is_convertible<typename std::iterator_traits<Iterator>::iterator_category, std::forward_iterator_tag>::value,
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bool>::type;
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template <typename Iterator>
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using IfIsNotForwardIterator = typename std::enable_if<
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!std::is_convertible<typename std::iterator_traits<Iterator>::iterator_category, std::forward_iterator_tag>::value,
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bool>::type;
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template <typename Container,
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typename InputIterator,
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IfIsNotForwardIterator<InputIterator> = true>
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void reserveIfForwardIterator(Container *, InputIterator, InputIterator)
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{
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}
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template <typename Container,
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typename ForwardIterator,
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IfIsForwardIterator<ForwardIterator> = true>
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void reserveIfForwardIterator(Container *c, ForwardIterator f, ForwardIterator l)
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{
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c->reserve(static_cast<typename Container::size_type>(std::distance(f, l)));
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}
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// for detecting expression validity
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template <typename ... T>
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using void_t = void;
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template <typename Iterator, typename = void_t<>>
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struct AssociativeIteratorHasKeyAndValue : std::false_type
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{
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};
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template <typename Iterator>
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struct AssociativeIteratorHasKeyAndValue<
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Iterator,
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void_t<decltype(std::declval<Iterator &>().key()),
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decltype(std::declval<Iterator &>().value())>
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>
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: std::true_type
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{
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};
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template <typename Iterator, typename = void_t<>, typename = void_t<>>
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struct AssociativeIteratorHasFirstAndSecond : std::false_type
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{
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};
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template <typename Iterator>
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struct AssociativeIteratorHasFirstAndSecond<
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Iterator,
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void_t<decltype(std::declval<Iterator &>()->first),
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decltype(std::declval<Iterator &>()->second)>
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>
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: std::true_type
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{
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};
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template <typename Iterator>
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using IfAssociativeIteratorHasKeyAndValue =
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typename std::enable_if<AssociativeIteratorHasKeyAndValue<Iterator>::value, bool>::type;
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template <typename Iterator>
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using IfAssociativeIteratorHasFirstAndSecond =
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typename std::enable_if<AssociativeIteratorHasFirstAndSecond<Iterator>::value, bool>::type;
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} // namespace QtPrivate
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QT_END_NAMESPACE
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#endif // QCONTAINERTOOLS_IMPL_H
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