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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_CHECK_GET_HPP
+#define SOL_STACK_CHECK_GET_HPP
+
+#include "stack_core.hpp"
+#include "stack_get.hpp"
+#include "stack_check.hpp"
+#include "optional.hpp"
+
+namespace sol {
+ namespace stack {
+ template <typename T, typename>
+ struct check_getter {
+ typedef decltype(stack_detail::unchecked_get<T>(nullptr, 0, std::declval<record&>())) R;
+
+ template <typename Handler>
+ static optional<R> get(lua_State* L, int index, Handler&& handler, record& tracking) {
+ if (!check<T>(L, index, std::forward<Handler>(handler))) {
+ tracking.use(static_cast<int>(!lua_isnone(L, index)));
+ return nullopt;
+ }
+ return stack_detail::unchecked_get<T>(L, index, tracking);
+ }
+ };
+
+ template <typename T>
+ struct check_getter<optional<T>> {
+ template <typename Handler>
+ static decltype(auto) get(lua_State* L, int index, Handler&&, record& tracking) {
+ return check_get<T>(L, index, no_panic, tracking);
+ }
+ };
+
+ template <typename T>
+ struct check_getter<T, std::enable_if_t<std::is_integral<T>::value && lua_type_of<T>::value == type::number>> {
+ template <typename Handler>
+ static optional<T> get(lua_State* L, int index, Handler&& handler, record& tracking) {
+ int isnum = 0;
+ lua_Integer value = lua_tointegerx(L, index, &isnum);
+ if (isnum == 0) {
+ type t = type_of(L, index);
+ tracking.use(static_cast<int>(t != type::none));
+ handler(L, index, type::number, t);
+ return nullopt;
+ }
+ tracking.use(1);
+ return static_cast<T>(value);
+ }
+ };
+
+ template <typename T>
+ struct check_getter<T, std::enable_if_t<std::is_enum<T>::value && !meta::any_same<T, meta_function, type>::value>> {
+ template <typename Handler>
+ static optional<T> get(lua_State* L, int index, Handler&& handler, record& tracking) {
+ int isnum = 0;
+ lua_Integer value = lua_tointegerx(L, index, &isnum);
+ if (isnum == 0) {
+ type t = type_of(L, index);
+ tracking.use(static_cast<int>(t != type::none));
+ handler(L, index, type::number, t);
+ return nullopt;
+ }
+ tracking.use(1);
+ return static_cast<T>(value);
+ }
+ };
+
+ template <typename T>
+ struct check_getter<T, std::enable_if_t<std::is_floating_point<T>::value>> {
+ template <typename Handler>
+ static optional<T> get(lua_State* L, int index, Handler&& handler, record& tracking) {
+ int isnum = 0;
+ lua_Number value = lua_tonumberx(L, index, &isnum);
+ if (isnum == 0) {
+ type t = type_of(L, index);
+ tracking.use(static_cast<int>(t != type::none));
+ handler(L, index, type::number, t);
+ return nullopt;
+ }
+ tracking.use(1);
+ return static_cast<T>(value);
+ }
+ };
+
+ template <typename T>
+ struct getter<optional<T>> {
+ static decltype(auto) get(lua_State* L, int index, record& tracking) {
+ return check_get<T>(L, index, no_panic, tracking);
+ }
+ };
+ } // stack
+} // sol
+
+#endif // SOL_STACK_CHECK_GET_HPP