You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
192 lines
8.1 KiB
192 lines
8.1 KiB
#ifndef LUABINDER_H
|
|
#define LUABINDER_H
|
|
|
|
#include "luavalue.h"
|
|
#include "luastate.h"
|
|
|
|
namespace luabinder
|
|
{
|
|
// transform const T& -> T
|
|
template<typename T>
|
|
struct remove_const_ref {
|
|
typedef typename std::remove_const<typename std::remove_reference<T>::type>::type type;
|
|
};
|
|
|
|
// pack an value into tuple recursively
|
|
template<int N>
|
|
struct pack_values_into_tuple {
|
|
template<typename Tuple>
|
|
static void call(Tuple& tuple, LuaState* lua) {
|
|
typedef typename std::tuple_element<N-1, Tuple>::type ValueType;
|
|
std::get<N-1>(tuple) = safe_luavalue_cast<ValueType>(lua->popValue());
|
|
pack_values_into_tuple<N-1>::call(tuple, lua);
|
|
}
|
|
};
|
|
template<>
|
|
struct pack_values_into_tuple<0> {
|
|
template<typename Tuple>
|
|
static void call(Tuple &tuple, LuaState* lua) { }
|
|
};
|
|
|
|
// call function
|
|
template<typename Ret, typename F, typename... Args>
|
|
typename std::enable_if<!std::is_void<Ret>::value, int>::type
|
|
call_fun_and_push_result(const F& f, LuaState* lua, Args... args) {
|
|
Ret ret = f(args...);
|
|
lua->pushValue(safe_to_luavalue(ret));
|
|
return 1;
|
|
}
|
|
|
|
// call function with no return
|
|
template<typename Ret, typename F, typename... Args>
|
|
typename std::enable_if<std::is_void<Ret>::value, int>::type
|
|
call_fun_and_push_result(const F& f, LuaState* lua, Args... args) {
|
|
f(args...);
|
|
return 0;
|
|
}
|
|
|
|
// expand function arguments for calling
|
|
template<int N, typename Ret>
|
|
struct expand_fun_arguments {
|
|
template<typename Tuple, typename F, typename... Args>
|
|
static int call(const Tuple& tuple, const F& f, LuaState* lua, Args... args) {
|
|
return expand_fun_arguments<N-1,Ret>::call(tuple, f, lua, std::cref(std::get<N-1>(tuple)), args...);
|
|
}
|
|
};
|
|
template<typename Ret>
|
|
struct expand_fun_arguments<0,Ret> {
|
|
template<typename Tuple, typename F, typename... Args>
|
|
static int call(const Tuple& tuple, const F& f, LuaState* lua, Args... args) {
|
|
return call_fun_and_push_result<Ret>(f, lua, args...);
|
|
}
|
|
};
|
|
|
|
// bind different types of functions
|
|
template<typename Ret, typename F, typename Tuple>
|
|
LuaCppFunction bind_fun_specializer(const F& f) {
|
|
enum { N = std::tuple_size<Tuple>::value };
|
|
return [=](LuaState* lua) {
|
|
if(lua->stackSize() != N)
|
|
throw LuaBadNumberOfArgumentsException(N, lua->stackSize());
|
|
Tuple tuple;
|
|
pack_values_into_tuple<N>::call(tuple, lua);
|
|
return expand_fun_arguments<N,Ret>::call(tuple, f, lua);
|
|
};
|
|
}
|
|
|
|
// bind a std::function
|
|
template<typename Ret, typename... Args>
|
|
LuaCppFunction bind_fun(const std::function<Ret(Args...)>& f) {
|
|
typedef typename std::tuple<typename remove_const_ref<Args>::type...> Tuple;
|
|
return bind_fun_specializer<typename remove_const_ref<Ret>::type,
|
|
decltype(f),
|
|
Tuple>(f);
|
|
}
|
|
|
|
// bind a custumized function
|
|
inline
|
|
LuaCppFunction bind_fun(const std::function<int(LuaState*)>& f) {
|
|
return f;
|
|
}
|
|
|
|
// convert to std::function then bind
|
|
template<typename Ret, typename... Args>
|
|
LuaCppFunction bind_fun(Ret (*f)(Args...)) {
|
|
return bind_fun(std::function<Ret(Args...)>(f));
|
|
}
|
|
|
|
// a tuple_element that works with the next algorithm
|
|
template<std::size_t __i, typename _Tp>
|
|
struct tuple_element;
|
|
template<std::size_t __i, typename _Head, typename... _Tail>
|
|
struct tuple_element<__i, std::tuple<_Head, _Tail...> >
|
|
: tuple_element<__i - 1, std::tuple<_Tail...> > { };
|
|
template<typename _Head, typename... _Tail>
|
|
struct tuple_element<0, std::tuple<_Head, _Tail...> > { typedef _Head type; };
|
|
template<typename _Head>
|
|
struct tuple_element<-1,std::tuple<_Head>> { typedef void type; };
|
|
template<std::size_t __i>
|
|
struct tuple_element<__i,std::tuple<>> { typedef void type; };
|
|
|
|
// rebind functions already binded by std::bind that have placeholders
|
|
template<typename Enable, int N, typename ArgsTuple, typename HoldersTuple, typename... Args>
|
|
struct get_holded_tuple;
|
|
|
|
template<int N, typename ArgsTuple, typename HoldersTuple, typename... Args>
|
|
struct get_holded_tuple<typename std::enable_if<(N > 0 && std::is_placeholder<typename tuple_element<N-1, HoldersTuple>::type>::value > 0), void>::type, N, ArgsTuple, HoldersTuple, Args...> {
|
|
typedef typename std::tuple_element<N-1, HoldersTuple>::type holder_type;
|
|
typedef typename tuple_element<std::is_placeholder<holder_type>::value-1, ArgsTuple>::type _arg_type;
|
|
typedef typename remove_const_ref<_arg_type>::type arg_type;
|
|
typedef typename get_holded_tuple<void, N-1, ArgsTuple, HoldersTuple, arg_type, Args...>::type type;
|
|
};
|
|
template<int N, typename ArgsTuple, typename HoldersTuple, typename... Args>
|
|
struct get_holded_tuple<typename std::enable_if<(N > 0 && std::is_placeholder<typename tuple_element<N-1, HoldersTuple>::type>::value == 0), void>::type, N, ArgsTuple, HoldersTuple, Args...> {
|
|
typedef typename get_holded_tuple<void, N-1, ArgsTuple, HoldersTuple, Args...>::type type;
|
|
};
|
|
template<typename ArgsTuple, typename HoldersTuple, typename... Args>
|
|
struct get_holded_tuple<void, 0, ArgsTuple, HoldersTuple, Args...> {
|
|
typedef typename std::tuple<Args...> type;
|
|
};
|
|
|
|
template<typename Ret, typename... Args, typename... Holders>
|
|
LuaCppFunction bind_fun(const std::_Bind<Ret (*(Holders...))(Args...)>& f) {
|
|
typedef typename std::tuple<Args...> ArgsTuple;
|
|
typedef typename std::tuple<Holders...> HoldersTuple;
|
|
typedef typename get_holded_tuple<void, sizeof...(Holders), ArgsTuple, HoldersTuple>::type Tuple;
|
|
return bind_fun_specializer<typename remove_const_ref<Ret>::type,
|
|
decltype(f),
|
|
Tuple>(f);
|
|
}
|
|
|
|
template<typename Obj, typename Ret, typename... Args, typename... Holders>
|
|
LuaCppFunction bind_fun(const std::_Bind<std::_Mem_fn<Ret (Obj::*)(Args...)>(Obj*, Holders...)>& f) {
|
|
typedef typename std::tuple<Args...> ArgsTuple;
|
|
typedef typename std::tuple<Holders...> HoldersTuple;
|
|
typedef typename get_holded_tuple<void, sizeof...(Holders), ArgsTuple, HoldersTuple>::type Tuple;
|
|
return bind_fun_specializer<typename remove_const_ref<Ret>::type,
|
|
decltype(f),
|
|
Tuple>(f);
|
|
}
|
|
|
|
// custumized functions already binded by std::bind doesn't need to be bind again
|
|
template<typename Obj>
|
|
LuaCppFunction bind_fun(const std::_Bind<std::_Mem_fn<int (Obj::*)(LuaState*)>(Obj*, std::_Placeholder<1>)>& f) {
|
|
return f;
|
|
}
|
|
inline
|
|
LuaCppFunction bind_fun(const std::_Bind<int (*(std::_Placeholder<1>))(LuaState*)>& f) {
|
|
return f;
|
|
}
|
|
|
|
// bind member function
|
|
template<typename Ret, typename Obj, typename... Args>
|
|
LuaCppFunction bind_mem_fun(Ret (Obj::*f)(Args...)) {
|
|
auto mf = std::mem_fn(f);
|
|
typedef typename std::tuple<Obj*, typename remove_const_ref<Args>::type...> Tuple;
|
|
return bind_fun_specializer<typename remove_const_ref<Ret>::type,
|
|
decltype(mf),
|
|
Tuple>(mf);
|
|
}
|
|
template<typename Ret, typename Obj, typename... Args>
|
|
LuaCppFunction bind_mem_fun(Ret (Obj::*f)(Args...) const) {
|
|
auto mf = std::mem_fn(f);
|
|
typedef typename std::tuple<Obj*, typename remove_const_ref<Args>::type...> Tuple;
|
|
return bind_fun_specializer<typename remove_const_ref<Ret>::type,
|
|
decltype(mf),
|
|
Tuple>(mf);
|
|
}
|
|
|
|
// bind custumized member function
|
|
template<typename Obj>
|
|
LuaCppFunction bind_mem_fun(int (Obj::*f)(LuaState*)) {
|
|
auto mf = std::mem_fn(f);
|
|
return [=](LuaState* lua) {
|
|
lua->insert(1);
|
|
auto obj = safe_luavalue_cast<Obj*>(lua->popValue());
|
|
return mf(obj, lua);
|
|
};
|
|
}
|
|
}
|
|
|
|
#endif // LUABINDER_H
|