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++ // Copyright (C) 2024 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #ifndef SPREADKEY_H
++ #define SPREADKEY_H
++
++ #include <utility>
++
++ namespace spread {
++ // make a const_iterator from an iterator for the same container
++ // to avoid mixing iterators with const_iterators warning
++ template <typename Container>
++ constexpr typename Container::const_iterator make_const(Container c, typename Container::iterator i)
++ {
++ return typename Container::const_iterator(i);
++ }
++ }
++
++ // using std::pair<> as SpreadKey for now
++ // for any further updates it could be anything
++ using SpreadKey = std::pair<int, int>;
++
++ #endif // SPREADKEY_H