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// Copyright (C) 2024 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 QGLIST_HELPER_P_H
#define QGLIST_HELPER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qtconfigmacros.h>
#include <glib.h>
#include <iterator>
QT_BEGIN_NAMESPACE
namespace QGstUtils {
template <typename ListType>
struct GListIterator
{
explicit GListIterator(const GList *element = nullptr) : element(element) { }
const ListType &operator*() const noexcept { return *operator->(); }
const ListType *operator->() const noexcept
{
return reinterpret_cast<const ListType *>(&element->data);
}
GListIterator &operator++() noexcept
{
if (element)
element = element->next;
return *this;
}
GListIterator operator++(int n) noexcept
{
for (int i = 0; i != n; ++i)
operator++();
return *this;
}
bool operator==(const GListIterator &r) const noexcept { return element == r.element; }
bool operator!=(const GListIterator &r) const noexcept { return element != r.element; }
using difference_type = std::ptrdiff_t;
using value_type = ListType;
using pointer = value_type *;
using reference = value_type &;
using iterator_category = std::input_iterator_tag;
const GList *element = nullptr;
};
template <typename ListType>
struct GListRangeAdaptor
{
static_assert(std::is_pointer_v<ListType>);
explicit GListRangeAdaptor(const GList *list) : head(list) { }
auto begin() { return GListIterator<ListType>(head); }
auto end() { return GListIterator<ListType>(nullptr); }
const GList *head;
};
} // namespace QGstUtils
QT_END_NAMESPACE
#endif
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