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+// 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_STACK_PROXY_HPP
+#define SOL_STACK_PROXY_HPP
+
+#include "stack.hpp"
+#include "function.hpp"
+#include "protected_function.hpp"
+#include "proxy_base.hpp"
+
+namespace sol {
+ struct stack_proxy : public proxy_base<stack_proxy> {
+ private:
+ lua_State* L;
+ int index;
+
+ public:
+ stack_proxy() : L(nullptr), index(0) {}
+ stack_proxy(lua_State* L, int index) : L(L), index(index) {}
+
+ template<typename T>
+ decltype(auto) get() const {
+ return stack::get<T>(L, stack_index());
+ }
+
+ int push() const {
+ lua_pushvalue(L, index);
+ return 1;
+ }
+
+ lua_State* lua_state() const { return L; }
+ int stack_index() const { return index; }
+
+ template<typename... Ret, typename... Args>
+ decltype(auto) call(Args&&... args) {
+ return get<function>().template call<Ret...>(std::forward<Args>(args)...);
+ }
+
+ template<typename... Args>
+ decltype(auto) operator()(Args&&... args) {
+ return call<>(std::forward<Args>(args)...);
+ }
+ };
+
+ namespace stack {
+ template <>
+ struct getter<stack_proxy> {
+ static stack_proxy get(lua_State* L, int index = -1) {
+ return stack_proxy(L, index);
+ }
+ };
+
+ template <>
+ struct pusher<stack_proxy> {
+ static int push(lua_State*, const stack_proxy& ref) {
+ return ref.push();
+ }
+ };
+ } // stack
+
+ namespace detail {
+ template <>
+ struct is_speshul<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...>, index_value<0>, index_value<I>, const T& fr) {
+ return stack_proxy(fr.lua_state(), static_cast<int>(fr.stack_index() + 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...>, index_value<N>, index_value<I>, const T& fr) {
+ return get(types<Args...>(), index_value<N - 1>(), index_value<I + lua_size<Arg>::value>(), fr);
+ }
+ }
+
+ template <>
+ struct tie_size<function_result> : std::integral_constant<std::size_t, SIZE_MAX> {};
+
+ template <std::size_t I>
+ stack_proxy get(const function_result& fr) {
+ return stack_proxy(fr.lua_state(), static_cast<int>(fr.stack_index() + I));
+ }
+
+ template <std::size_t I, typename... Args>
+ stack_proxy get(types<Args...> t, const function_result& fr) {
+ return detail::get(t, index_value<I>(), index_value<0>(), fr);
+ }
+
+ template <>
+ struct tie_size<protected_function_result> : std::integral_constant<std::size_t, SIZE_MAX> {};
+
+ template <std::size_t I>
+ stack_proxy get(const protected_function_result& fr) {
+ return stack_proxy(fr.lua_state(), static_cast<int>(fr.stack_index() + I));
+ }
+
+ template <std::size_t I, typename... Args>
+ stack_proxy get(types<Args...> t, const protected_function_result& fr) {
+ return detail::get(t, index_value<I>(), index_value<0>(), fr);
+ }
+} // sol
+
+#endif // SOL_STACK_PROXY_HPP