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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_FUNCTION_HPP
+#define SOL_FUNCTION_HPP
+
+#include "reference.hpp"
+#include "stack.hpp"
+#include "function_result.hpp"
+#include "function_types.hpp"
+#include <cstdint>
+#include <functional>
+#include <memory>
+
+namespace sol {
+ template <typename base_t>
+ class basic_function : public base_t {
+ private:
+ void luacall(std::ptrdiff_t argcount, std::ptrdiff_t resultcount) const {
+ lua_callk(base_t::lua_state(), static_cast<int>(argcount), static_cast<int>(resultcount), 0, nullptr);
+ }
+
+ template<std::size_t... I, typename... Ret>
+ auto invoke(types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n) const {
+ luacall(n, lua_size<std::tuple<Ret...>>::value);
+ 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) const {
+ luacall(n, lua_size<Ret>::value);
+ 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) const {
+ luacall(n, 0);
+ }
+
+ function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n) const {
+ int stacksize = lua_gettop(base_t::lua_state());
+ int firstreturn = (std::max)(1, stacksize - static_cast<int>(n));
+ luacall(n, LUA_MULTRET);
+ int poststacksize = lua_gettop(base_t::lua_state());
+ int returncount = poststacksize - (firstreturn - 1);
+ return function_result(base_t::lua_state(), firstreturn, returncount);
+ }
+
+ public:
+ basic_function() = default;
+ template <typename T, meta::enable<meta::neg<std::is_same<meta::unqualified_t<T>, basic_function>>, meta::neg<std::is_same<base_t, stack_reference>>, std::is_base_of<base_t, meta::unqualified_t<T>>> = meta::enabler>
+ basic_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_function>(base_t::lua_state(), -1, type_panic);
+ }
+#endif // Safety
+ }
+ basic_function(const basic_function&) = default;
+ basic_function& operator=(const basic_function&) = default;
+ basic_function(basic_function&&) = default;
+ basic_function& operator=(basic_function&&) = default;
+ basic_function(const stack_reference& r) : basic_function(r.lua_state(), r.stack_index()) {}
+ basic_function(stack_reference&& r) : basic_function(r.lua_state(), r.stack_index()) {}
+ basic_function(lua_State* L, int index = -1) : base_t(L, index) {
+#ifdef SOL_CHECK_ARGUMENTS
+ stack::check<basic_function>(L, index, type_panic);
+#endif // Safety
+ }
+
+ template<typename... Args>
+ 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 {
+ 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);
+ }
+ };
+
+ namespace stack {
+ template<typename Signature>
+ struct getter<std::function<Signature>> {
+ typedef meta::bind_traits<Signature> fx_t;
+ typedef typename fx_t::args_list args_lists;
+ typedef meta::tuple_types<typename fx_t::return_type> return_types;
+
+ template<typename... Args, typename... Ret>
+ static std::function<Signature> get_std_func(types<Ret...>, types<Args...>, lua_State* L, int index) {
+ sol::function f(L, index);
+ auto fx = [f, L, index](Args&&... args) -> meta::return_type_t<Ret...> {
+ return f.call<Ret...>(std::forward<Args>(args)...);
+ };
+ return std::move(fx);
+ }
+
+ template<typename... FxArgs>
+ static std::function<Signature> get_std_func(types<void>, types<FxArgs...>, lua_State* L, int index) {
+ sol::function f(L, index);
+ auto fx = [f, L, index](FxArgs&&... args) -> void {
+ f(std::forward<FxArgs>(args)...);
+ };
+ return std::move(fx);
+ }
+
+ template<typename... FxArgs>
+ static std::function<Signature> get_std_func(types<>, types<FxArgs...> t, lua_State* L, int index) {
+ return get_std_func(types<void>(), t, L, index);
+ }
+
+ static std::function<Signature> get(lua_State* L, int index, record& tracking) {
+ tracking.last = 1;
+ tracking.used += 1;
+ type t = type_of(L, index);
+ if (t == type::none || t == type::nil) {
+ return nullptr;
+ }
+ return get_std_func(return_types(), args_lists(), L, index);
+ }
+ };
+ } // stack
+} // sol
+
+#endif // SOL_FUNCTION_HPP