mirror of
https://github.com/ThePhD/sol2.git
synced 2024-03-22 13:10:44 +08:00
176 lines
6.4 KiB
C++
176 lines
6.4 KiB
C++
// sol3
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// The MIT License (MIT)
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// Copyright (c) 2013-2019 Rapptz, ThePhD and contributors
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_UNSAFE_FUNCTION_HPP
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#define SOL_UNSAFE_FUNCTION_HPP
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#include "reference.hpp"
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#include "object.hpp"
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#include "stack.hpp"
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#include "function_result.hpp"
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#include "function_types.hpp"
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#include "bytecode.hpp"
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#include "dump_handler.hpp"
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#include <cstdint>
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namespace sol {
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template <typename ref_t, bool aligned = false>
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class basic_function : public basic_object<ref_t> {
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private:
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using base_t = basic_object<ref_t>;
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void luacall(std::ptrdiff_t argcount, std::ptrdiff_t resultcount) const {
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lua_call(lua_state(), static_cast<int>(argcount), static_cast<int>(resultcount));
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}
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template <std::size_t... I, typename... Ret>
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auto invoke(types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n) const {
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luacall(n, lua_size<std::tuple<Ret...>>::value);
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return stack::pop<std::tuple<Ret...>>(lua_state());
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}
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template <std::size_t I, typename Ret, meta::enable<meta::neg<std::is_void<Ret>>> = meta::enabler>
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Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n) const {
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luacall(n, lua_size<Ret>::value);
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return stack::pop<Ret>(lua_state());
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}
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template <std::size_t I>
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void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n) const {
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luacall(n, 0);
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}
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unsafe_function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n) const {
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int stacksize = lua_gettop(lua_state());
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int firstreturn = (std::max)(1, stacksize - static_cast<int>(n));
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luacall(n, LUA_MULTRET);
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int poststacksize = lua_gettop(lua_state());
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int returncount = poststacksize - (firstreturn - 1);
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return unsafe_function_result(lua_state(), firstreturn, returncount);
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}
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public:
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using base_t::lua_state;
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basic_function() = default;
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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>>, meta::neg<std::is_same<lua_nil_t, meta::unqualified_t<T>>>, is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_function(T&& r) noexcept
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: base_t(std::forward<T>(r)) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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if (!is_function<meta::unqualified_t<T>>::value) {
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_function>(lua_state(), -1, handler);
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}
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#endif // Safety
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}
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basic_function(const basic_function&) = default;
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basic_function& operator=(const basic_function&) = default;
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basic_function(basic_function&&) = default;
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basic_function& operator=(basic_function&&) = default;
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basic_function(const stack_reference& r)
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: basic_function(r.lua_state(), r.stack_index()) {
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}
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basic_function(stack_reference&& r)
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: basic_function(r.lua_state(), r.stack_index()) {
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}
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basic_function(lua_nil_t n)
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: base_t(n) {
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}
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template <typename T, meta::enable<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_function(lua_State* L, T&& r)
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: base_t(L, std::forward<T>(r)) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_function>(lua_state(), -1, handler);
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#endif // Safety
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}
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basic_function(lua_State* L, int index = -1)
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: base_t(L, index) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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constructor_handler handler{};
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stack::check<basic_function>(L, index, handler);
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#endif // Safety
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}
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basic_function(lua_State* L, ref_index index)
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: base_t(L, index) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_function>(lua_state(), -1, handler);
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#endif // Safety
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}
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template <typename Fx>
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int dump(lua_Writer writer, void* userdata, bool strip, Fx&& on_error) const {
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this->push();
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auto ppn = stack::push_popper_n<false>(this->lua_state(), 1);
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int r = lua_dump(this->lua_state(), writer, userdata, strip ? 1 : 0);
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if (r != 0) {
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return on_error(this->lua_state(), r, writer, userdata, strip);
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}
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return r;
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}
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int dump(lua_Writer writer, void* userdata, bool strip = false) const {
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return dump(writer, userdata, strip, &dump_throw_on_error);
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}
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template <typename Container = bytecode>
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Container dump() const {
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Container bc;
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(void)dump(static_cast<lua_Writer>(&basic_insert_dump_writer<Container>), static_cast<void*>(&bc), false, &dump_panic_on_error);
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return bc;
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}
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template <typename Container = bytecode, typename Fx>
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Container dump(Fx&& on_error) const {
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Container bc;
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(void)dump(static_cast<lua_Writer>(&basic_insert_dump_writer<Container>), static_cast<void*>(&bc), false, std::forward<Fx>(on_error));
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return bc;
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}
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template <typename... Args>
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unsafe_function_result operator()(Args&&... args) const {
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return call<>(std::forward<Args>(args)...);
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}
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template <typename... Ret, typename... Args>
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decltype(auto) operator()(types<Ret...>, Args&&... args) const {
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return call<Ret...>(std::forward<Args>(args)...);
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}
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template <typename... Ret, typename... Args>
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decltype(auto) call(Args&&... args) const {
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if (!aligned) {
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base_t::push();
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}
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int pushcount = stack::multi_push_reference(lua_state(), std::forward<Args>(args)...);
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return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), static_cast<std::ptrdiff_t>(pushcount));
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}
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};
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} // namespace sol
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#endif // SOL_UNSAFE_FUNCTION_HPP
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