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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_PROTECTED_FUNCTION_HPP
+#define SOL_PROTECTED_FUNCTION_HPP
+
+#include "reference.hpp"
+#include "stack.hpp"
+#include "protected_function_result.hpp"
+#include <cstdint>
+#include <algorithm>
+
+namespace sol {
+ namespace detail {
+ inline reference& handler_storage() {
+ static sol::reference h;
+ return h;
+ }
+
+ struct handler {
+ const reference& target;
+ int stackindex;
+ handler(const reference& target) : target(target), stackindex(0) {
+ if (target.valid()) {
+ stackindex = lua_gettop(target.lua_state()) + 1;
+ target.push();
+ }
+ }
+ bool valid() const { return stackindex != 0; }
+ ~handler() {
+ if (valid()) {
+ lua_remove(target.lua_state(), stackindex);
+ }
+ }
+ };
+ }
+
+ template <typename base_t>
+ class basic_protected_function : public base_t {
+ public:
+ static reference& get_default_handler() {
+ return detail::handler_storage();
+ }
+
+ static void set_default_handler(const reference& ref) {
+ detail::handler_storage() = ref;
+ }
+
+ static void set_default_handler(reference&& ref) {
+ detail::handler_storage() = std::move(ref);
+ }
+
+ private:
+ call_status luacall(std::ptrdiff_t argcount, std::ptrdiff_t resultcount, detail::handler& h) const {
+ return static_cast<call_status>(lua_pcallk(base_t::lua_state(), static_cast<int>(argcount), static_cast<int>(resultcount), h.stackindex, 0, nullptr));
+ }
+
+ template<std::size_t... I, typename... Ret>
+ auto invoke(types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n, detail::handler& h) const {
+ luacall(n, sizeof...(Ret), h);
+ return stack::pop<std::tuple<Ret...>>(base_t::lua_state());
+ }
+
+ template<std::size_t I, typename Ret>
+ Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n, detail::handler& h) const {
+ luacall(n, 1, h);
+ return stack::pop<Ret>(base_t::lua_state());
+ }
+
+ template <std::size_t I>
+ void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n, detail::handler& h) const {
+ luacall(n, 0, h);
+ }
+
+ protected_function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n, detail::handler& h) const {
+ int stacksize = lua_gettop(base_t::lua_state());
+ int poststacksize = stacksize;
+ int firstreturn = 1;
+ int returncount = 0;
+ call_status code = call_status::ok;
+#ifndef SOL_NO_EXCEPTIONS
+ auto onexcept = [&](const char* error) {
+ h.stackindex = 0;
+ if (h.target.valid()) {
+ h.target.push();
+ stack::push(base_t::lua_state(), error);
+ lua_call(base_t::lua_state(), 1, 1);
+ }
+ else {
+ stack::push(base_t::lua_state(), error);
+ }
+ };
+ try {
+#endif // No Exceptions
+ firstreturn = (std::max)(1, static_cast<int>(stacksize - n - static_cast<int>(h.valid())));
+ code = luacall(n, LUA_MULTRET, h);
+ poststacksize = lua_gettop(base_t::lua_state()) - static_cast<int>(h.valid());
+ returncount = poststacksize - (firstreturn - 1);
+#ifndef SOL_NO_EXCEPTIONS
+ }
+ // Handle C++ errors thrown from C++ functions bound inside of lua
+ catch (const char* error) {
+ onexcept(error);
+ firstreturn = lua_gettop(base_t::lua_state());
+ return protected_function_result(base_t::lua_state(), firstreturn, 0, 1, call_status::runtime);
+ }
+ catch (const std::exception& error) {
+ onexcept(error.what());
+ firstreturn = lua_gettop(base_t::lua_state());
+ return protected_function_result(base_t::lua_state(), firstreturn, 0, 1, call_status::runtime);
+ }
+ catch (...) {
+ onexcept("caught (...) unknown error during protected_function call");
+ firstreturn = lua_gettop(base_t::lua_state());
+ return protected_function_result(base_t::lua_state(), firstreturn, 0, 1, call_status::runtime);
+ }
+#endif // No Exceptions
+ return protected_function_result(base_t::lua_state(), firstreturn, returncount, returncount, code);
+ }
+
+ public:
+ reference error_handler;
+
+ basic_protected_function() = default;
+ template <typename T, meta::enable<meta::neg<std::is_same<meta::unqualified_t<T>, basic_protected_function>>, meta::neg<std::is_same<base_t, stack_reference>>, std::is_base_of<base_t, meta::unqualified_t<T>>> = meta::enabler>
+ basic_protected_function(T&& r) noexcept : base_t(std::forward<T>(r)) {
+#ifdef SOL_CHECK_ARGUMENTS
+ if (!is_function<meta::unqualified_t<T>>::value) {
+ auto pp = stack::push_pop(*this);
+ stack::check<basic_protected_function>(base_t::lua_state(), -1, type_panic);
+ }
+#endif // Safety
+ }
+ basic_protected_function(const basic_protected_function&) = default;
+ basic_protected_function& operator=(const basic_protected_function&) = default;
+ basic_protected_function(basic_protected_function&&) = default;
+ basic_protected_function& operator=(basic_protected_function&&) = default;
+ basic_protected_function(const basic_function<base_t>& b, reference eh = get_default_handler()) : base_t(b), error_handler(std::move(eh)) {}
+ basic_protected_function(basic_function<base_t>&& b, reference eh = get_default_handler()) : base_t(std::move(b)), error_handler(std::move(eh)) {}
+ basic_protected_function(const stack_reference& r, reference eh = get_default_handler()) : basic_protected_function(r.lua_state(), r.stack_index(), std::move(eh)) {}
+ basic_protected_function(stack_reference&& r, reference eh = get_default_handler()) : basic_protected_function(r.lua_state(), r.stack_index(), std::move(eh)) {}
+ template <typename Super>
+ basic_protected_function(proxy_base<Super>&& p, reference eh = get_default_handler()) : basic_protected_function(p.operator basic_function<base_t>(), std::move(eh)) {}
+ template <typename Super>
+ basic_protected_function(const proxy_base<Super>& p, reference eh = get_default_handler()) : basic_protected_function(static_cast<basic_function<base_t>>(p), std::move(eh)) {}
+ basic_protected_function(lua_State* L, int index = -1, reference eh = get_default_handler()) : base_t(L, index), error_handler(std::move(eh)) {
+#ifdef SOL_CHECK_ARGUMENTS
+ stack::check<basic_protected_function>(L, index, type_panic);
+#endif // Safety
+ }
+
+ template<typename... Args>
+ protected_function_result operator()(Args&&... args) const {
+ return call<>(std::forward<Args>(args)...);
+ }
+
+ template<typename... Ret, typename... Args>
+ decltype(auto) operator()(types<Ret...>, Args&&... args) const {
+ return call<Ret...>(std::forward<Args>(args)...);
+ }
+
+ template<typename... Ret, typename... Args>
+ decltype(auto) call(Args&&... args) const {
+ detail::handler h(error_handler);
+ base_t::push();
+ int pushcount = stack::multi_push_reference(base_t::lua_state(), std::forward<Args>(args)...);
+ return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), pushcount, h);
+ }
+ };
+} // sol
+
+#endif // SOL_FUNCTION_HPP