qmultimedia_ranges_p.h

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// Copyright (C) 2025 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 QMULTIMEDIA_RANGES_P_H
#define QMULTIMEDIA_RANGES_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>
 
#ifdef __cpp_lib_ranges
#  include <ranges> // IWYU pragma: export
#endif
 
#include <algorithm>
 
QT_BEGIN_NAMESPACE
 
namespace QtMultimediaPrivate::ranges {
 
#ifdef __cpp_lib_ranges
using std::ranges::equal;
using std::ranges::fill;
 
#else
 
// Caveat: best effort, not a 1-to-1 mapping to c++20 style ranges
 
constexpr auto equal = [](const auto &lhs, const auto &rhs, auto &&predicate) {
    return std::equal(lhs.begin(), lhs.end(), rhs.begin(), rhs.end(), predicate);
};
 
constexpr auto fill = [](auto &range, auto &&value) {
    return std::fill(std::begin(range), std::end(range), value);
};
 
#endif
 
} // namespace QtMultimediaPrivate::ranges
 
QT_END_NAMESPACE
 
#endif // QMULTIMEDIA_RANGES_P_H