220 lines
9.1 KiB
C++
220 lines
9.1 KiB
C++
/*
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* Copyright (c) 2010-2012 OTClient <https://github.com/edubart/otclient>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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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,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef LUABINDER_H
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#define LUABINDER_H
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// this file is and must be included only from luainterface.h
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#include "luainterface.h"
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#include "luaexception.h"
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/// This namespace contains some dirty metaprogamming that uses a lot of C++0x features
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/// The purpose here is to create templates that can bind any function from C++
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/// and expose in lua environment. This is done combining variadic templates,
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/// lambdas, tuples and some type traits features from the new C++0x standard to create
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/// templates that can detect functions's arguments and then generate lambdas. These lambdas
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/// pops arguments from lua stack, call the bound C++ function and then
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/// pushes the result to lua.
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namespace luabinder
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{
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/// Removes const references, transforming 'const T&' into 'T'
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template<typename T>
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struct remove_const_ref {
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typedef typename std::remove_const<typename std::remove_reference<T>::type>::type type;
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};
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/// Pack arguments from lua stack into a tuple recursively
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template<int N>
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struct pack_values_into_tuple {
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template<typename Tuple>
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static void call(Tuple& tuple, LuaInterface* lua) {
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typedef typename std::tuple_element<N-1, Tuple>::type ValueType;
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std::get<N-1>(tuple) = lua->polymorphicPop<ValueType>();
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pack_values_into_tuple<N-1>::call(tuple, lua);
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}
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};
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template<>
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struct pack_values_into_tuple<0> {
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template<typename Tuple>
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static void call(Tuple& tuple, LuaInterface* lua) { }
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};
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/// C++ function caller that can push results to lua
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template<typename Ret, typename F, typename... Args>
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typename std::enable_if<!std::is_void<Ret>::value, int>::type
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call_fun_and_push_result(const F& f, LuaInterface* lua, const Args&... args) {
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Ret ret = f(args...);
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int numRets = lua->polymorphicPush(ret);
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return numRets;
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}
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/// C++ void function caller
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template<typename Ret, typename F, typename... Args>
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typename std::enable_if<std::is_void<Ret>::value, int>::type
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call_fun_and_push_result(const F& f, LuaInterface* lua, const Args&... args) {
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f(args...);
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return 0;
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}
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/// Expand arguments from tuple for later calling the C++ function
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template<int N, typename Ret>
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struct expand_fun_arguments {
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template<typename Tuple, typename F, typename... Args>
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static int call(const Tuple& tuple, const F& f, LuaInterface* lua, const Args&... args) {
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return expand_fun_arguments<N-1,Ret>::call(tuple, f, lua, std::get<N-1>(tuple), args...);
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}
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};
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template<typename Ret>
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struct expand_fun_arguments<0,Ret> {
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template<typename Tuple, typename F, typename... Args>
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static int call(const Tuple& tuple, const F& f, LuaInterface* lua, const Args&... args) {
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return call_fun_and_push_result<Ret>(f, lua, args...);
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}
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};
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/// Bind different types of functions generating a lambda
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template<typename Ret, typename F, typename Tuple>
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LuaCppFunction bind_fun_specializer(const F& f) {
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enum { N = std::tuple_size<Tuple>::value };
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return [=](LuaInterface* lua) -> int {
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while(lua->stackSize() != N) {
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if(lua->stackSize() < N)
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g_lua.pushNil();
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else
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g_lua.pop();
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}
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Tuple tuple;
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pack_values_into_tuple<N>::call(tuple, lua);
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return expand_fun_arguments<N,Ret>::call(tuple, f, lua);
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};
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}
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/// Bind a customized function
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inline
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LuaCppFunction bind_fun(const std::function<int(LuaInterface*)>& f) {
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return f;
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}
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/// Bind a std::function
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template<typename Ret, typename... Args>
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LuaCppFunction bind_fun(const std::function<Ret(Args...)>& f) {
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typedef typename std::tuple<typename remove_const_ref<Args>::type...> Tuple;
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return bind_fun_specializer<typename remove_const_ref<Ret>::type,
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decltype(f),
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Tuple>(f);
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}
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/// Specialization for lambdas
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template<typename F>
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struct bind_lambda_fun;
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template<typename Lambda, typename Ret, typename... Args>
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struct bind_lambda_fun<Ret(Lambda::*)(Args...) const> {
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static LuaCppFunction call(const Lambda& f) {
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typedef typename std::tuple<typename remove_const_ref<Args>::type...> Tuple;
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return bind_fun_specializer<typename remove_const_ref<Ret>::type,
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decltype(f),
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Tuple>(f);
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}
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};
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template<typename Lambda>
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typename std::enable_if<std::is_constructible<decltype(&Lambda::operator())>::value, LuaCppFunction>::type bind_fun(const Lambda& f) {
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typedef decltype(&Lambda::operator()) F;
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return bind_lambda_fun<F>::call(f);
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}
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/// Convert to C++ functions pointers to std::function then bind
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template<typename Ret, typename... Args>
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LuaCppFunction bind_fun(Ret (*f)(Args...)) {
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return bind_fun(std::function<Ret(Args...)>(f));
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}
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/// Create member function lambdas
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template<typename Ret, typename C, typename... Args>
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std::function<Ret(const std::shared_ptr<C>&, const Args&...)> make_mem_func(Ret (C::* f)(Args...)) {
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auto mf = std::mem_fn(f);
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return [=](const std::shared_ptr<C>& obj, const Args&... args) mutable -> Ret {
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if(!obj)
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throw LuaException("failed to call a member function because the passed object is nil");
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return mf(obj.get(), args...);
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};
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}
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template<typename C, typename... Args>
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std::function<void(const std::shared_ptr<C>&, const Args&...)> make_mem_func(void (C::* f)(Args...)) {
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auto mf = std::mem_fn(f);
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return [=](const std::shared_ptr<C>& obj, const Args&... args) mutable -> void {
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if(!obj)
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throw LuaException("failed to call a member function because the passed object is nil");
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mf(obj.get(), args...);
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};
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}
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/// Create member function lambdas for singleton classes
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template<typename Ret, typename C, typename... Args>
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std::function<Ret(const Args&...)> make_mem_func_singleton(Ret (C::* f)(Args...), C* instance) {
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auto mf = std::mem_fn(f);
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return [=](Args... args) mutable -> Ret { return mf(instance, args...); };
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}
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template<typename C, typename... Args>
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std::function<void(const Args&...)> make_mem_func_singleton(void (C::* f)(Args...), C* instance) {
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auto mf = std::mem_fn(f);
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return [=](Args... args) mutable -> void { mf(instance, args...); };
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}
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/// Bind member functions
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template<typename C, typename Ret, class FC, typename... Args>
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LuaCppFunction bind_mem_fun(Ret (FC::* f)(Args...)) {
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typedef typename std::tuple<std::shared_ptr<FC>, typename remove_const_ref<Args>::type...> Tuple;
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auto lambda = make_mem_func<Ret,FC>(f);
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return bind_fun_specializer<typename remove_const_ref<Ret>::type,
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decltype(lambda),
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Tuple>(lambda);
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}
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/// Bind singleton member functions
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template<typename C, typename Ret, class FC, typename... Args>
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LuaCppFunction bind_singleton_mem_fun(Ret (FC::*f)(Args...), C *instance) {
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typedef typename std::tuple<typename remove_const_ref<Args>::type...> Tuple;
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assert(instance);
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auto lambda = make_mem_func_singleton<Ret,FC>(f, static_cast<FC*>(instance));
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return bind_fun_specializer<typename remove_const_ref<Ret>::type,
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decltype(lambda),
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Tuple>(lambda);
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}
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/// Bind customized member functions
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template<typename C>
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LuaCppFunction bind_mem_fun(int (C::*f)(LuaInterface*)) {
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auto mf = std::mem_fn(f);
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return [=](LuaInterface* lua) -> int {
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auto obj = lua->castValue<std::shared_ptr<C>>(1);
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lua->remove(1);
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return mf(obj, lua);
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};
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}
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}
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#endif
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