[Bug c/20181] Increment/decrement

["d_picco at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From d_picco at hotmail dot com  2005-02-23 20:24 -------
(In reply to comment #0)
> Consider these situations:
> 
> int a = 0;
> int b = a++ + a++;
> int c = (a++) + (a++);
> int d = a++ + (a++);
> int e = (a++) + a++;
> 
> b == c == d == e == 0.  I understand based on a previous bug about sequence
> points in C++ but I think a common-sense approach takes precident here.  If 'a'
> were a user-defined class with the operator++ (postfix), how could the user
> mimic such behaviour, namely b == c == d == e == 0?  In fact they couldn't.  The
> proper solution is then to have b == c == d == e == 1.

I should have clarified this more:

Consider these situations:

Case 1
======
int a = 0;
int b = a++ + a++

Case 2
======
int a = 0;
int c = (a++) + a++;

Case 3
======

... etc

Otherwise b != c != d != e if the situations were read sequentially

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20181