heteregenous string maps

#feat

Author: alandefreitas

include/mrdocs/ADT/UnorderedStringMap.hpp

@@ -0,0 +1,34 @@
+//
+// This is a derivative work. originally part of the LLVM Project.
+// Licensed under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+// Copyright (c) 2025 Alan de Freitas ([email protected])
+//
+// Official repository: https://github.com/cppalliance/mrdocs
+//
+
+#ifndef MRDOCS_API_ADT_UNORDEREDSTRINGMAP_HPP
+#define MRDOCS_API_ADT_UNORDEREDSTRINGMAP_HPP
+
+#include <unordered_map>
+#include <string>
+
+namespace clang::mrdocs {
+
+struct string_hash
+{
+    using hash_type = std::hash<std::string_view>;
+    using is_transparent = void;
+    std::size_t operator()(const char* str) const        { return hash_type{}(str); }
+    std::size_t operator()(std::string_view str) const   { return hash_type{}(str); }
+    std::size_t operator()(std::string const& str) const { return hash_type{}(str); }
+};
+
+template <class T>
+using UnorderedStringMap = std::unordered_map<std::string, T, string_hash, std::equal_to<>>;
+
+} // clang::mrdocs
+
+#endif