sol2/sol/stack_pop.hpp

// 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
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#ifndef SOL_STACK_POP_HPP
#define SOL_STACK_POP_HPP

#include "stack_core.hpp"
#include "stack_get.hpp"
#include <utility>
#include <tuple>

namespace sol {
	namespace stack {
		template <typename T, typename>
		struct popper {
			inline static decltype(auto) pop(lua_State* L) {
				decltype(auto) r = get<T>(L);
				lua_pop(L, 1);
				return r;
			}
		};

		template <typename... Args>
		struct popper<std::tuple<Args...>> {
			inline static decltype(auto) pop(lua_State* L) {
				decltype(auto) r = get<std::tuple<Args...>>(L);
				lua_pop(L, static_cast<int>(sizeof...(Args)));
				return r;
			}
		};

		template <typename A, typename B>
		struct popper<std::pair<A, B>> {
			inline static decltype(auto) pop(lua_State* L) {
				decltype(auto) r = get<std::pair<A, B>>(L);
				lua_pop(L, 2);
				return r;
			}
		};

		template <typename T>
		struct popper<T, std::enable_if_t<std::is_base_of<stack_reference, meta::unqualified_t<T>>::value>> {
			static_assert(meta::neg<std::is_base_of<stack_reference, meta::unqualified_t<T>>>::value, "You cannot pop something that derives from stack_reference: it will not remain on the stack and thusly will go out of scope!");
		};
	} // stack
} // sol

#endif // SOL_STACK_POP_HPP