sol2/include/sol/function_result.hpp

// sol3

// The MIT License (MIT)

// Copyright (c) 2013-2021 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
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#ifndef SOL_FUNCTION_RESULT_HPP
#define SOL_FUNCTION_RESULT_HPP

#include <sol/protected_function_result.hpp>
#include <sol/unsafe_function_result.hpp>

#include <cstdint>

namespace sol {

	namespace detail {
		template <>
		struct is_speshul<unsafe_function_result> : std::true_type { };
		template <>
		struct is_speshul<protected_function_result> : std::true_type { };

		template <std::size_t I, typename... Args, typename T>
		stack_proxy get(types<Args...>, meta::index_value<0>, meta::index_value<I>, const T& fr) {
			return stack_proxy(fr.lua_state(), fr.stack_index() + static_cast<int>(I));
		}

		template <std::size_t I, std::size_t N, typename Arg, typename... Args, typename T, meta::enable<meta::boolean<(N > 0)>> = meta::enabler>
		stack_proxy get(types<Arg, Args...>, meta::index_value<N>, meta::index_value<I>, const T& fr) {
			return get(types<Args...>(), meta::index_value<N - 1>(), meta::index_value<I + lua_size<Arg>::value>(), fr);
		}
	} // namespace detail

	template <>
	struct tie_size<unsafe_function_result> : std::integral_constant<std::size_t, SIZE_MAX> { };

	template <>
	struct tie_size<protected_function_result> : std::integral_constant<std::size_t, SIZE_MAX> { };

	template <std::size_t I>
	stack_proxy get(const unsafe_function_result& fr) {
		return stack_proxy(fr.lua_state(), fr.stack_index() + static_cast<int>(I));
	}

	template <std::size_t I, typename... Args>
	stack_proxy get(types<Args...> t, const unsafe_function_result& fr) {
		return detail::get(t, meta::index_value<I>(), meta::index_value<0>(), fr);
	}

	template <std::size_t I>
	stack_proxy get(const protected_function_result& fr) {
		return stack_proxy(fr.lua_state(), fr.stack_index() + static_cast<int>(I));
	}

	template <std::size_t I, typename... Args>
	stack_proxy get(types<Args...> t, const protected_function_result& fr) {
		return detail::get(t, meta::index_value<I>(), meta::index_value<0>(), fr);
	}
} // namespace sol

#endif // SOL_FUNCTION_RESULT_HPP