void main_source(twointsclass * &data){data=new twointsclass;data->a=1;data->b=2;delete data;}void main(){twointsclass * data;data=NULL;main_source(data);printIntLine(data->a);}
static void main_source(twointsclass * &data){data=new twointsclass;data->a=1;data->b=2;delete data;}static void main(){twointsclass * data;data=NULL;main_source(data);}