1 files changed, 38 insertions, 0 deletions
diff --git a/src/utility.hh b/src/utility.hh
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+// This file is part of Cait <https://github.com/Fuwn/cait>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// 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 <[email protected]>
+// 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