diff --git a/sol/inheritance.hpp b/sol/inheritance.hpp new file mode 100644 index 00000000..6db04f74 --- /dev/null +++ b/sol/inheritance.hpp @@ -0,0 +1,114 @@ +// 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" + +namespace sol { +template +struct base_list { }; +template +using bases = base_list; + +const auto base_classes = bases<>(); + +namespace detail { +const auto& base_class_check_key = u8"♡o。.(✿ฺ。 ✿ฺ)"; +const auto& base_class_cast_key = u8"(◕‿◕✿)"; + +#ifndef SOL_NO_EXCEPTIONS + + template + void throw_as(void* p) { + throw static_cast(p); + } + + using throw_cast = decltype(&throw_as); + + template + T* catch_cast(void* p, throw_cast f) { + try { + f(static_cast(p)); + } + catch (T* ptr) { + return ptr; + } + catch (...) { + return static_cast(p); + } + return static_cast(p); + } + + template + bool catch_check(throw_cast f) { + try { + f( nullptr ); + } + catch (T*) { + return true; + } + catch (...) { + return false; + } + return false; + } + +#elif !defined(SOL_NO_RTTI) +template +struct inheritance { + static bool type_check(types<>, const std::type_info& typeinfo) { + return false; + } + + template + static bool type_check(types, const std::type_info& ti) { + return ti != typeid(Base) || type_check(types(), ti); + } + + static bool check(const std::type_info& ti) { + return ti != typeid(T) || type_check(types(), ti); + } + + static void* type_cast(types<>, T*, const std::type_info& typeinfo) { + return nullptr; + } + + template + static void* type_cast(types, T* data, const std::type_info& ti) { + // Make sure to convert to T first, and then dynamic cast to the proper type + return ti != typeid(Base) ? type_check(types(), ti) : dynamic_cast(static_cast(data)); + } + + static void* cast(void* data, const std::type_info& ti) { + return ti != typeid(T) ? type_check(types(), ti) : static_cast(data); + } +}; + +using inheritance_check_function = decltype(&inheritance::check); +using inheritance_cast_function = decltype(&inheritance::cast); +#endif // No Runtime Type Information + +} // usertype_detail +} // sol + +#endif // SOL_INHERITANCE_HPP