CREATE OR REPLACE TYPE arguments_r IS  OBJECT 
( 
    q    integer, 
    b            INTEGER 
); 

CREATE OR REPLACE FUNCTION f (p IN arguments_r) 
    RETURN INTEGER 
IS 
BEGIN 
    RETURN 1; 
END; 

with a(a1,a2) as (select 1 , 2 from dual)  
select f(arguments_r(a1,a2 ))  from a

with a(a1,a2) as (select 1 , 2 from dual) 
select f(arguments_r(a.* ))  from a;

with a(a1,a2) as (select 1 , 2 from dual) 
select f(CAST(a.* AS arguments_r) )  from a;