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+// The MIT License (MIT)
+
+// Copyright (c) 2013-2016 Rapptz, ThePhD and contributors
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SOL_INHERITANCE_HPP
+#define SOL_INHERITANCE_HPP
+
+#include "types.hpp"
+#include <atomic>
+
+namespace sol {
+ template <typename... Args>
+ struct base_list { };
+ template <typename... Args>
+ using bases = base_list<Args...>;
+
+ typedef bases<> base_classes_tag;
+ const auto base_classes = base_classes_tag();
+
+ namespace detail {
+
+ template <typename T>
+ struct has_derived {
+ static bool value;
+ };
+
+ template <typename T>
+ bool has_derived<T>::value = false;
+
+ inline std::size_t unique_id() {
+ static std::atomic<std::size_t> x(0);
+ return ++x;
+ }
+
+ template <typename T>
+ struct id_for {
+ static const std::size_t value;
+ };
+
+ template <typename T>
+ const std::size_t id_for<T>::value = unique_id();
+
+ inline decltype(auto) base_class_check_key() {
+ static const auto& key = "class_check";
+ return key;
+ }
+
+ inline decltype(auto) base_class_cast_key() {
+ static const auto& key = "class_cast";
+ return key;
+ }
+
+ inline decltype(auto) base_class_index_propogation_key() {
+ static const auto& key = u8"\xF0\x9F\x8C\xB2.index";
+ return key;
+ }
+
+ inline decltype(auto) base_class_new_index_propogation_key() {
+ static const auto& key = u8"\xF0\x9F\x8C\xB2.new_index";
+ return key;
+ }
+
+ template <typename T, typename... Bases>
+ struct inheritance {
+ static bool type_check_bases(types<>, std::size_t) {
+ return false;
+ }
+
+ template <typename Base, typename... Args>
+ static bool type_check_bases(types<Base, Args...>, std::size_t ti) {
+ return ti == id_for<Base>::value || type_check_bases(types<Args...>(), ti);
+ }
+
+ static bool type_check(std::size_t ti) {
+ return ti == id_for<T>::value || type_check_bases(types<Bases...>(), ti);
+ }
+
+ static void* type_cast_bases(types<>, T*, std::size_t) {
+ return nullptr;
+ }
+
+ template <typename Base, typename... Args>
+ static void* type_cast_bases(types<Base, Args...>, T* data, std::size_t ti) {
+ // Make sure to convert to T first, and then dynamic cast to the proper type
+ return ti != id_for<Base>::value ? type_cast_bases(types<Args...>(), data, ti) : static_cast<void*>(static_cast<Base*>(data));
+ }
+
+ static void* type_cast(void* voiddata, std::size_t ti) {
+ T* data = static_cast<T*>(voiddata);
+ return static_cast<void*>(ti != id_for<T>::value ? type_cast_bases(types<Bases...>(), data, ti) : data);
+ }
+ };
+
+ using inheritance_check_function = decltype(&inheritance<void>::type_check);
+ using inheritance_cast_function = decltype(&inheritance<void>::type_cast);
+
+ } // detail
+} // sol
+
+#endif // SOL_INHERITANCE_HPP