Seems to be a bug/ stack.hpp line 217 getter function

[flywith-liang]

template
struct getter<T&> {
static T& get(lua_State* L, int index = -1) {
void* udata = lua_touserdata(L, index);
T** obj = static_cast<T**>(udata);
return **obj;
}
};

after:

template
struct getter<T&> {
static T& get(lua_State* L, int index = -1) {
void* udata = lua_touserdata(L, index);
T* obj = static_cast<T*>(udata); // here change
return *obj; // here change
}
};