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Diffstat (limited to 'src/corelib/kernel/qiterable.h')
-rw-r--r-- | src/corelib/kernel/qiterable.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/corelib/kernel/qiterable.h b/src/corelib/kernel/qiterable.h new file mode 100644 index 0000000000..9498dbde79 --- /dev/null +++ b/src/corelib/kernel/qiterable.h @@ -0,0 +1,149 @@ +/**************************************************************************** +** +** Copyright (C) 2020 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QITERABLE_H +#define QITERABLE_H + +#include <QtCore/qglobal.h> +#include <QtCore/qtypeinfo.h> +#include <QtCore/qmetacontainer.h> +#include <QtCore/qmetatype.h> + +QT_BEGIN_NAMESPACE + +class Q_CORE_EXPORT QSequentialIterable +{ + uint m_revision = 0; + const void *m_iterable = nullptr; + QMetaSequence m_metaSequence; + +public: + struct Q_CORE_EXPORT const_iterator + { + private: + const QSequentialIterable *m_iterable = nullptr; + void *m_iterator = nullptr; + QAtomicInt *m_ref = nullptr; + + friend class QSequentialIterable; + explicit const_iterator(const QSequentialIterable *iterable, void *iterator); + + public: + ~const_iterator(); + + const_iterator(const const_iterator &other); + + const_iterator& operator=(const const_iterator &other); + + const QVariant operator*() const; + bool operator==(const const_iterator &o) const; + bool operator!=(const const_iterator &o) const; + const_iterator &operator++(); + const_iterator operator++(int); + const_iterator &operator--(); + const_iterator operator--(int); + const_iterator &operator+=(int j); + const_iterator &operator-=(int j); + const_iterator operator+(int j) const; + const_iterator operator-(int j) const; + friend inline const_iterator operator+(int j, const const_iterator &k) { return k + j; } + }; + + friend struct const_iterator; + + template<class T> + QSequentialIterable(const T *p) + : m_iterable(p) + , m_metaSequence(QMetaSequence::fromContainer<T>()) + { + } + + QSequentialIterable() = default; + + QSequentialIterable(const QMetaSequence &metaSequence, const void *iterable) + : m_iterable(iterable) + , m_metaSequence(metaSequence) + { + } + + const_iterator begin() const; + const_iterator end() const; + + QVariant at(qsizetype idx) const; + qsizetype size() const; + + bool canReverseIterate() const; + + const void *constIterable() const { return m_iterable; } + QMetaSequence metaSequence() const { return m_metaSequence; } +}; + +namespace QtPrivate { + +template<typename From> +struct QSequentialIterableConvertFunctor +{ + QSequentialIterable operator()(const From &f) const + { + return QSequentialIterable(&f); + } +}; + +template<typename T> +struct SequentialValueTypeIsMetaType<T, true> +{ + static bool registerConverter(int id) + { + const int toId = qMetaTypeId<QSequentialIterable>(); + if (!QMetaType::hasRegisteredConverterFunction(id, toId)) { + QSequentialIterableConvertFunctor<T> o; + return QMetaType::registerConverter<T, QSequentialIterable>(o); + } + return true; + } +}; + +} + +Q_DECLARE_TYPEINFO(QSequentialIterable, Q_MOVABLE_TYPE); +Q_DECLARE_TYPEINFO(QSequentialIterable::const_iterator, Q_MOVABLE_TYPE); + +QT_END_NAMESPACE + +#endif // QITERABLE_H |