Medusa Slockbower
6d58105734
- Refactored lang yet again, `fennec/lang` is now C++ language. `fennec/string` `fennec/filesystem` and `fennec/format` are now independent.
77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
// =====================================================================================================================
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// fennec, a free and open source game engine
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// Copyright © 2025 Medusa Slockbower
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// =====================================================================================================================
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///
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/// \file _this_t.h
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/// \brief
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///
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///
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/// \details
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/// \author Medusa Slockbower
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///
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/// \copyright Copyright © 2025 Medusa Slockbower ([GPLv3](https://www.gnu.org/licenses/gpl-3.0.en.html))
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///
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///
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#ifndef FENNEC_RTTI_DETAIL_THIS_T_H
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#define FENNEC_RTTI_DETAIL_THIS_T_H
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#include <fennec/lang/type_transforms.h>
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#define FENNEC_DEFINE_THIS_T \
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private: \
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struct _this_t_tag {}; \
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constexpr auto _this_t_helper() -> decltype(fennec::detail::_this::writer<_this_t_tag, decltype(this)>{}, void()) {} \
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public: \
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using this_t = fennec::detail::_this::read<_this_t_tag>
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namespace fennec::detail
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{
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// https://stackoverflow.com/a/70701479
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#if FENNEC_COMPILER_GCC
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wnon-template-friend"
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#endif
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namespace _this {
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template <typename T>
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struct reader
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{
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friend auto _test(reader<T>);
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};
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template <typename T, typename U>
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struct writer
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{
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friend auto _test(reader<T>){return U{};}
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};
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inline void _test() {}
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template <typename T>
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using read = remove_pointer_t<decltype(_test(reader<T>{}))>;
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};
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#if FENNEC_COMPILER_GCC
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#pragma GCC diagnostic pop
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#endif
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}
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#endif // FENNEC_RTTI_DETAIL_THIS_T_H
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