TITLE: incrementing enums


PROBLEM: Stephen Baynes <baynes@ukpsshp1.serigate.philips.nl>

[digit is an enum]

: digit++;

I think that this is something that has changed in the life of C++. This
was originally allowed but modern compilers now reject it. This one cost
me quite a bit of rewriting when I had to port some code from an older
C++ compiler to a new one (and not the only thing).

You can use :
        digit = (numbers) ( digit + 1 );

In my view if the standard prohibits the use of ++ and -- on enums (which is
what now seems to be the case) then that is a bad decision by the standard 
makers. It is often necessary to itterate over a enumerated type.


RESPONSE: maxtal@Physics.usyd.edu.au (John Max Skaller)

	Something _else_ changed to compensate, Stephen. enums are
now also first class types -- you can overload on them. So you can 
write:

	template<class T> void operator++(T& t) { t = (T) (t+1); }
	// or variation thereof

and suddenly all your enums++ work again.