mirror of
https://github.com/ThePhD/sol2.git
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196 lines
7.4 KiB
C++
196 lines
7.4 KiB
C++
// sol3
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// The MIT License (MIT)
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// Copyright (c) 2013-2021 Rapptz, ThePhD and contributors
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_INHERITANCE_HPP
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#define SOL_INHERITANCE_HPP
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#include <sol/types.hpp>
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#include <sol/usertype_traits.hpp>
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#include <sol/unique_usertype_traits.hpp>
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namespace sol {
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template <typename... Args>
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struct base_list { };
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template <typename... Args>
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using bases = base_list<Args...>;
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typedef bases<> base_classes_tag;
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const auto base_classes = base_classes_tag();
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template <typename... Args>
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struct is_to_stringable<base_list<Args...>> : std::false_type { };
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namespace detail {
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inline decltype(auto) base_class_check_key() {
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static const auto& key = "class_check";
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return key;
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}
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inline decltype(auto) base_class_cast_key() {
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static const auto& key = "class_cast";
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return key;
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}
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inline decltype(auto) base_class_index_propogation_key() {
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static const auto& key = u8"\xF0\x9F\x8C\xB2.index";
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return key;
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}
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inline decltype(auto) base_class_new_index_propogation_key() {
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static const auto& key = u8"\xF0\x9F\x8C\xB2.new_index";
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return key;
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}
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template <typename T>
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struct inheritance {
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typedef typename base<T>::type bases_t;
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static bool type_check_bases(types<>, const string_view&) {
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return false;
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}
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template <typename Base, typename... Args>
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static bool type_check_bases(types<Base, Args...>, const string_view& ti) {
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return ti == usertype_traits<Base>::qualified_name() || type_check_bases(types<Args...>(), ti);
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}
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static bool type_check(const string_view& ti) {
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return ti == usertype_traits<T>::qualified_name() || type_check_bases(bases_t(), ti);
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}
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template <typename... Bases>
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static bool type_check_with(const string_view& ti) {
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return ti == usertype_traits<T>::qualified_name() || type_check_bases(types<Bases...>(), ti);
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}
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static void* type_cast_bases(types<>, T*, const string_view&) {
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return nullptr;
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}
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template <typename Base, typename... Args>
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static void* type_cast_bases(types<Base, Args...>, T* data, const string_view& ti) {
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// Make sure to convert to T first, and then dynamic cast to the proper type
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return ti != usertype_traits<Base>::qualified_name() ? type_cast_bases(types<Args...>(), data, ti)
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: static_cast<void*>(static_cast<Base*>(data));
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}
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static void* type_cast(void* voiddata, const string_view& ti) {
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T* data = static_cast<T*>(voiddata);
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return static_cast<void*>(ti != usertype_traits<T>::qualified_name() ? type_cast_bases(bases_t(), data, ti) : data);
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}
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template <typename... Bases>
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static void* type_cast_with(void* voiddata, const string_view& ti) {
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T* data = static_cast<T*>(voiddata);
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return static_cast<void*>(ti != usertype_traits<T>::qualified_name() ? type_cast_bases(types<Bases...>(), data, ti) : data);
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}
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template <typename U>
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static bool type_unique_cast_bases(types<>, void*, void*, const string_view&) {
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return 0;
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}
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template <typename U, typename Base, typename... Args>
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static int type_unique_cast_bases(types<Base, Args...>, void* source_data, void* target_data, const string_view& ti) {
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using uu_traits = unique_usertype_traits<U>;
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using base_ptr = typename uu_traits::template rebind_actual_type<Base>;
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string_view base_ti = usertype_traits<Base>::qualified_name();
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if (base_ti == ti) {
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if (target_data != nullptr) {
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U* source = static_cast<U*>(source_data);
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base_ptr* target = static_cast<base_ptr*>(target_data);
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// perform proper derived -> base conversion
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*target = *source;
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}
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return 2;
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}
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return type_unique_cast_bases<U>(types<Args...>(), source_data, target_data, ti);
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}
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template <typename U>
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static int type_unique_cast(void* source_data, void* target_data, const string_view& ti, const string_view& rebind_ti) {
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if constexpr (is_actual_type_rebindable_for_v<U>) {
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using rebound_actual_type = unique_usertype_rebind_actual_t<U>;
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using maybe_bases_or_empty = meta::conditional_t<std::is_void_v<rebound_actual_type>, types<>, bases_t>;
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string_view this_rebind_ti = usertype_traits<rebound_actual_type>::qualified_name();
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if (rebind_ti != this_rebind_ti) {
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// this is not even of the same unique type
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return 0;
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}
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string_view this_ti = usertype_traits<T>::qualified_name();
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if (ti == this_ti) {
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// direct match, return 1
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return 1;
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}
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return type_unique_cast_bases<U>(maybe_bases_or_empty(), source_data, target_data, ti);
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}
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else {
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(void)rebind_ti;
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string_view this_ti = usertype_traits<T>::qualified_name();
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if (ti == this_ti) {
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// direct match, return 1
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return 1;
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}
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return type_unique_cast_bases<U>(types<>(), source_data, target_data, ti);
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}
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}
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template <typename U, typename... Bases>
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static int type_unique_cast_with(void* source_data, void* target_data, const string_view& ti, const string_view& rebind_ti) {
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using uc_bases_t = types<Bases...>;
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if constexpr (is_actual_type_rebindable_for_v<U>) {
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using rebound_actual_type = unique_usertype_rebind_actual_t<U>;
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using cond_bases_t = meta::conditional_t<std::is_void_v<rebound_actual_type>, types<>, uc_bases_t>;
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string_view this_rebind_ti = usertype_traits<rebound_actual_type>::qualified_name();
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if (rebind_ti != this_rebind_ti) {
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// this is not even of the same unique type
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return 0;
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}
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string_view this_ti = usertype_traits<T>::qualified_name();
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if (ti == this_ti) {
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// direct match, return 1
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return 1;
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}
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return type_unique_cast_bases<U>(cond_bases_t(), source_data, target_data, ti);
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}
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else {
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(void)rebind_ti;
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string_view this_ti = usertype_traits<T>::qualified_name();
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if (ti == this_ti) {
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// direct match, return 1
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return 1;
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}
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return type_unique_cast_bases<U>(types<>(), source_data, target_data, ti);
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}
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}
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};
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using inheritance_check_function = decltype(&inheritance<void>::type_check);
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using inheritance_cast_function = decltype(&inheritance<void>::type_cast);
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using inheritance_unique_cast_function = decltype(&inheritance<void>::type_unique_cast<void>);
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} // namespace detail
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} // namespace sol
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#endif // SOL_INHERITANCE_HPP
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