//use for struct to lua
public void NewUserDataWithGC(object o)
{
GCHandle handle = GCHandle.Alloc(o);
IntPtr obj_ptr = GCHandle.ToIntPtr(handle);
IntPtr ptr = LuaAPI.lua_newuserdata(this.m_lua, IntPtr.Size);
Marshal.WriteIntPtr(ptr, obj_ptr);
SetGCFunc();
}
private GCHandle NewUserData(object o)
{
GCHandle handle = GCHandle.Alloc(o);
IntPtr obj_ptr = GCHandle.ToIntPtr(handle);
IntPtr ptr = LuaAPI.lua_newuserdata(this.m_lua, IntPtr.Size);
Marshal.WriteIntPtr(ptr, obj_ptr);
return(handle);
}