I have a DateTime[][] arg (actually my own date type, but that
shouldnt matter). Ordered by time series ticker (eg a stock) and
then the date.
eg arg[0] might be the dates relating to IBM and arg[0][0] would
be the date of the first point in IBM time series.
I would like to find the intersection of the dates.
so setIntersection(arg[0],arg[1],arg[2] .. arg[$-1])
except that I don't know how many series are in arg at compile
time.
what's the most efficient way to use Phobos to find these? (I
could write a loop, but I am trying to learn how to use
std.algorithm better).
