Check if a given function returns something

Hi All,
I want to check if a sub routine that I am calling returns a value or not.
This is how my code is
$str = function(parameter)

sub function
{
........
......
........
}

the sub routine function in turn uses many other function. Some of these functions have a return statement and some do not.

So, when i invoke the sub routine "function" and i pass the returned value into $str, I need to check if $str has any value assigned or not.

Can you tell me how I could accomplish this?

Thanks,
Vijay




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