// This file is part of Cait <https://github.com/Fuwn/cait>.
// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
// SPDX-License-Identifier: GPL-3.0-only

#ifndef UTILITY_HH
#define UTILITY_HH

#include <cstdint>

namespace cait::utility {

// "Hash" a string so that it can be used within a `switch` statement.
//
// https://stackoverflow.com/a/46711735/14452787
constexpr auto hash(const char *data, std::size_t const size = 0) noexcept
    -> std::uint32_t {
  return !data[size] ? 5381
                     : (hash(data, size + 1) * 33) ^
                           static_cast<unsigned char>(data[size]);
}

} // namespace cait::utility

#endif // UTILITY_HH