convert std_logic_vector_16 to std_logic_vector_32

hello

now i get to convert
std_logic_vector(15 downto 0) to std_logic_vector(31 downto 0)

i have the stupid way is:
convert std_logic_vector_16 to an integer, and then convert this integer to
std_logic_vector_32.

is there any better way or existen function to do this job?

thinkyou

zty....
.........

zty