Function to find list of all possible combinations

Hi,
Is there any function in vc++ to find the list of all possible combiantion of array.
for example for the following array {1,2,3}

i want to derive all possible combinations like
(1),(2),(3),(1,2),(1,3),(2,3),(1,2,3)

Thanks in Advace,
Varadha

I think...You need to design your own logic..