I have been following this thread and come to the following conclusion, which
does not require a new version of the compiler but follows the suggestion that
it can be implemented using: x[(a, b)] (as opposed to x[a, b].

What you do is overload operator() as you wish, which may pass onto operator[]
(argList), which could be a private member of the class. argList could be
another (helper) object that operator () builds and initializes with whatever
it accepts as parameters?

I am aware this does have limitations, but I consider a useful solution for the
time being , until a more permanent, long term one is devised.

What do you all think of this?

Sunil Puri
sunil.puri@toronto.can.ipguild.org