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/****************************************************************************
**
** 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>
#include <QtCore/qtaggedpointer.h>
QT_BEGIN_NAMESPACE
namespace QtPrivate {
template<typename Type, typename Storage = Type>
class QConstPreservingPointer
{
enum Tag : bool { Const, Mutable };
QTaggedPointer<Storage, Tag> m_pointer;
public:
QConstPreservingPointer(std::nullptr_t) : m_pointer(nullptr, Const) {}
QConstPreservingPointer(const void *pointer, qsizetype alignment)
: m_pointer(reinterpret_cast<Storage *>(const_cast<void *>(pointer)), Const)
{
Q_UNUSED(alignment);
Q_ASSERT(alignment > qsizetype(alignof(Storage)));
}
QConstPreservingPointer(void *pointer, qsizetype alignment)
: m_pointer(reinterpret_cast<Storage *>(pointer), Mutable)
{
Q_UNUSED(alignment);
Q_ASSERT(alignment > qsizetype(alignof(Storage)));
}
template<typename InputType>
QConstPreservingPointer(const InputType *pointer)
: m_pointer(reinterpret_cast<Storage *>(const_cast<InputType *>(pointer)), Const)
{
static_assert(alignof(InputType) >= alignof(Storage));
}
template<typename InputType>
QConstPreservingPointer(InputType *pointer)
: m_pointer(reinterpret_cast<Storage *>(pointer), Mutable)
{
static_assert(alignof(InputType) >= alignof(Storage));
}
QConstPreservingPointer() = default;
const Type *constPointer() const
{
return reinterpret_cast<const Type *>(m_pointer.data());
}
Type *mutablePointer() const
{
return m_pointer.tag() == Mutable ? reinterpret_cast<Type *>(m_pointer.data()) : nullptr;
}
};
}
class Q_CORE_EXPORT QSequentialIterable
{
uint m_revision = 0;
QtPrivate::QConstPreservingPointer<void, quint16> m_iterable;
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>())
{
Q_UNUSED(m_revision);
}
QSequentialIterable() = default;
template<typename Pointer>
QSequentialIterable(const QMetaSequence &metaSequence, Pointer iterable)
: m_iterable(iterable)
, m_metaSequence(metaSequence)
{
}
const_iterator begin() const;
const_iterator end() const;
QVariant at(qsizetype idx) const;
qsizetype size() const;
enum Position { Unspecified, AtBegin, AtEnd };
void addValue(const QVariant &value, Position position = Unspecified);
void removeValue(Position position = Unspecified);
bool canForwardIterate() const;
bool canReverseIterate() const;
const void *constIterable() const { return m_iterable.constPointer(); }
// TODO: fix this when introducing mutable iterables
void *mutableIterable() { return const_cast<void *>(m_iterable.constPointer()); }
QMetaSequence metaSequence() const { return m_metaSequence; }
QMetaType valueMetaType() const { return m_metaSequence.valueMetaType(); }
};
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
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