sol2/sol/usertype.hpp

// sol2 

// The MIT License (MIT)

// Copyright (c) 2013-2018 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_USERTYPE_HPP
#define SOL_USERTYPE_HPP

#include "stack.hpp"
#include "usertype_metatable.hpp"
#include "simple_usertype_metatable.hpp"
#include "container_usertype_metatable.hpp"
#include <memory>

namespace sol {

	template <typename T>
	class usertype {
	private:
		std::unique_ptr<usertype_detail::registrar, detail::deleter> metatableregister;

		template <typename... Args>
		usertype(detail::verified_tag, Args&&... args)
		: metatableregister(detail::make_unique_deleter<usertype_metatable<T, std::make_index_sequence<sizeof...(Args) / 2>, Args...>, detail::deleter>(std::forward<Args>(args)...)) {
			static_assert(detail::has_destructor<Args...>::value, "this type does not have an explicit destructor declared; please pass a custom destructor function wrapped in sol::destruct, especially if the type does not have an accessible (private) destructor");
		}

		template <typename... Args>
		usertype(detail::add_destructor_tag, Args&&... args)
		: usertype(detail::verified, std::forward<Args>(args)..., "__gc", default_destructor) {
		}

		template <typename... Args>
		usertype(detail::check_destructor_tag, Args&&... args)
		: usertype(meta::condition<meta::all<std::is_destructible<T>, meta::neg<detail::has_destructor<Args...>>>, detail::add_destructor_tag, detail::verified_tag>(), std::forward<Args>(args)...) {
		}

	public:
		template <typename... Args>
		usertype(Args&&... args)
		: usertype(meta::condition<meta::all<std::is_default_constructible<T>, meta::neg<detail::has_constructor<Args...>>>, decltype(default_constructor), detail::check_destructor_tag>(), std::forward<Args>(args)...) {
		}

		template <typename... Args, typename... CArgs>
		usertype(constructors<CArgs...> constructorlist, Args&&... args)
		: usertype(detail::check_destructor_tag(), std::forward<Args>(args)..., "new", constructorlist) {
		}

		template <typename... Args, typename... Fxs>
		usertype(constructor_wrapper<Fxs...> constructorlist, Args&&... args)
		: usertype(detail::check_destructor_tag(), std::forward<Args>(args)..., "new", constructorlist) {
		}

		template <typename... Args>
		usertype(simple_tag, lua_State* L, Args&&... args)
		: metatableregister(detail::make_unique_deleter<simple_usertype_metatable<T>, detail::deleter>(L, std::forward<Args>(args)...)) {
		}

		usertype_detail::registrar* registrar_data() {
			return metatableregister.get();
		}

		int push(lua_State* L) {
			int r = metatableregister->push_um(L);
			metatableregister = nullptr;
			return r;
		}
	};

	template <typename T>
	class simple_usertype : public usertype<T> {
	private:
		typedef usertype<T> base_t;
		lua_State* state;

	public:
		template <typename... Args>
		simple_usertype(lua_State* L, Args&&... args)
		: base_t(simple, L, std::forward<Args>(args)...), state(L) {
		}

		template <typename N, typename F>
		void set(N&& n, F&& f) {
			auto meta = static_cast<simple_usertype_metatable<T>*>(base_t::registrar_data());
			meta->add(state, std::forward<N>(n), std::forward<F>(f));
		}
	};

	namespace stack {
		template <typename T>
		struct pusher<usertype<T>> {
			static int push(lua_State* L, usertype<T>& user) {
				return user.push(L);
			}
		};
	} // namespace stack
} // namespace sol

#endif // SOL_USERTYPE_HPP