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https://github.com/ThePhD/sol2.git
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19d01ecd1d
STATEFUL FUNCTIONS! Any stateful function now works and is properly cleaned up, thanks to some additional metatables that are associated with the function values. This lays the ground work for class bindings, but that's a far off dream. For now, table retrieval and `operator[]` is what's for dinner.
249 lines
8.8 KiB
C++
249 lines
8.8 KiB
C++
// The MIT License (MIT)
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// Copyright (c) 2013 Danny Y., Rapptz
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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_LUA_FUNC_HPP
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#define SOL_LUA_FUNC_HPP
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#include "functional.hpp"
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#include "stack.hpp"
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#include <memory>
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namespace sol {
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template<typename TFx>
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struct static_lua_func {
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typedef typename std::remove_pointer<typename std::decay<TFx>::type>::type fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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template<typename... Args>
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static int typed_call(types<void>, types<Args...> t, fx_t* fx, lua_State* L) {
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stack::pop_call(L, fx, t);
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return 0;
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}
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template<typename... TRn, typename... Args>
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static int typed_call(types<TRn...>, types<Args...> t, fx_t* fx, lua_State* L) {
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auto r = stack::pop_call(L, fx, t);
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stack::push(L, std::move(r));
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return sizeof...(TRn);
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}
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static int call(lua_State* L) {
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void* functiondata = lua_touserdata(L, lua_upvalueindex(1));
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//if (functiondata == nullptr)
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// throw sol_error("call from lua to c++ function has null function pointer data");
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fx_t* fx = reinterpret_cast<fx_t*>(functiondata);
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int r = typed_call(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), fx, L);
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return r;
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}
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int operator()(lua_State* L) {
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return call(L);
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}
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};
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template<typename T, typename TFx>
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struct static_object_lua_func {
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typedef typename std::decay<TFx>::type fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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template<typename... Args>
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static int typed_call(types<void>, types<Args...>, T& item, fx_t& ifx, lua_State* L) {
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auto fx = [ &item, &ifx ] (Args&&... args) { (item.*ifx)(std::forward<Args>(args)...); };
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stack::pop_call(L, fx, types<Args...>());
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return 0;
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}
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template<typename TR, typename... Args>
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static int typed_call(types<TR>, types<Args...>, T& item, fx_t& ifx, lua_State* L) {
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auto fx = [ &item, &ifx ] (Args&&... args) -> TR { return (item.*ifx)(std::forward<Args>(args)...); };
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auto r = stack::pop_call(L, fx, types<Args...>());
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stack::push(L, std::move(r));
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return 1;
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}
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template<typename... TRn, typename... Args>
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static int typed_call(types<TRn...>, types<Args...>, T& item, fx_t& ifx, lua_State* L) {
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auto fx = [ &item, &ifx ] (Args&&... args) -> std::tuple<TRn...> { return (item.*ifx)(std::forward<Args>(args)...); };
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auto r = stack::pop_call(L, fx, types<Args...>());
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stack::push(L, std::move(r));
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return sizeof...(TRn);
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}
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static int call(lua_State* L) {
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const static std::size_t data_t_count = (sizeof(fx_t)+(sizeof(void*)-1)) / sizeof(void*);
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typedef std::array<void*, data_t_count> data_t;
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data_t fxptrdata;
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int upvalue = 1;
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for (std::size_t i = 0; i < fxptrdata.size(); ++i) {
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fxptrdata[ i ] = lua_touserdata(L, lua_upvalueindex(upvalue++));
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}
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void* objectdata = lua_touserdata(L, lua_upvalueindex(upvalue++));
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//if (objectdata == nullptr)
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// throw sol_error("call from lua to c++ function has null object data");
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fx_t* fxptr = reinterpret_cast<fx_t*>(static_cast<void*>(fxptrdata.data()));
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fx_t& mem_ptr = *fxptr;
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T& obj = *static_cast<T*>(objectdata);
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int r = typed_call(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), obj, mem_ptr, L);
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return r;
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}
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int operator()(lua_State* L) {
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return call(L);
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}
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};
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struct lua_func {
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static int call(lua_State* L) {
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void** pinheritancedata = static_cast<void**>(lua_touserdata(L, lua_upvalueindex(1)));
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void* inheritancedata = *pinheritancedata;
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if (inheritancedata == nullptr)
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throw sol_error("call from lua to c++ function has null data");
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lua_func* pfx = static_cast<lua_func*>(inheritancedata);
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lua_func& fx = *pfx;
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int r = fx(L);
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return r;
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}
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static int gc(lua_State* L) {
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void** puserdata = static_cast<void**>(lua_touserdata(L, 1));
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void* userdata = *puserdata;
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lua_func* ptr = static_cast<lua_func*>(userdata);
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std::default_delete<lua_func> dx{ };
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dx(ptr);
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return 0;
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}
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virtual int operator()(lua_State*) {
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throw sol_error("Failure to call specialized wrapped C++ function from lua");
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}
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virtual ~lua_func() {};
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};
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template<typename TFx>
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struct lambda_lua_func : public lua_func {
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typedef decltype(&TFx::operator()) fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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TFx fx;
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template<typename... FxArgs>
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lambda_lua_func(FxArgs&&... fxargs): fx(std::forward<FxArgs>(fxargs)...) {}
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virtual int operator()(lua_State* L) override {
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return (*this)(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), L);
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}
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template<typename... Args>
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int operator()(types<void>, types<Args...> t, lua_State* L) {
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stack::pop_call(L, fx, t);
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return 0;
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}
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template<typename... TRn, typename... Args>
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int operator()(types<TRn...>, types<Args...> t, lua_State* L) {
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auto r = stack::pop_call(L, fx, t);
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stack::push(L, r);
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return sizeof...(TRn);
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}
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~lambda_lua_func() {
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}
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};
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template<typename TFx, typename T = TFx, bool is_member_pointer = std::is_member_function_pointer<TFx>::value>
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struct explicit_lua_func : public lua_func {
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typedef typename std::remove_pointer<typename std::decay<TFx>::type>::type fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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TFx fx;
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template<typename... FxArgs>
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explicit_lua_func(FxArgs&&... fxargs): fx(std::forward<FxArgs>(fxargs)...) {}
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virtual int operator()(lua_State* L) override {
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return (*this)(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), L);
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}
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template<typename... Args>
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int operator()(types<void>, types<Args...> t, lua_State* L) {
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stack::pop_call(L, fx, t);
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return 0;
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}
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template<typename... TRn, typename... Args>
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int operator()(types<TRn...>, types<Args...> t, lua_State* L) {
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auto r = stack::pop_call(L, fx, t);
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stack::push(L, std::move(r));
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return sizeof...(TRn);
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}
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~explicit_lua_func() {
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}
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};
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template<typename TFx, typename T>
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struct explicit_lua_func<TFx, T, true> : public lua_func {
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typedef typename std::remove_pointer<typename std::decay<TFx>::type>::type fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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struct lambda {
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T member;
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TFx invocation;
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template<typename... FxArgs>
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lambda(T m, FxArgs&&... fxargs): member(std::move(m)), invocation(std::forward<FxArgs>(fxargs)...) {}
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template<typename... Args>
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typename fx_traits::return_type operator()(Args&&... args) {
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return (member.*invocation)(std::forward<Args>(args)...);
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}
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} fx;
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template<typename... FxArgs>
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explicit_lua_func(T m, FxArgs&&... fxargs): fx(std::move(m), std::forward<FxArgs>(fxargs)...) {}
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virtual int operator()(lua_State* L) override {
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return (*this)(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), L);
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}
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template<typename... Args>
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int operator()(types<void>, types<Args...> t, lua_State* L) {
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stack::pop_call(L, fx, t);
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return 0;
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}
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template<typename... TRn, typename... Args>
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int operator()(types<TRn...>, types<Args...> t, lua_State* L) {
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auto r = stack::pop_call(L, fx, t);
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stack::push(L, r);
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return sizeof...(TRn);
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}
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~explicit_lua_func() {
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}
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};
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} // sol
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#endif // SOL_LUA_FUNC_HPP
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