[GiNaC-list] Use of STL iterators in GiNaC

[Jens Vollinga]

Hi,

Pierangelo Masarati schrieb:
>> I see no problem with dereferencing end(), and doing operations like 
>> end()+<integer>. In that case, end() should return a proper iterator 
>> as a temporary and on these the operations +,- are defined (somewhere 
>> 24.1.5 in the standard, I believe). But maybe there is a ++ or -- 
>> involved?
> 
> As far as I recall, end() cannot be dereferenced, but only used to test 
> for out-of-range.  In any case, to track problems run-time with 

yes, sorry, you're right. The dereferencing is of course not guaranteed 
to work. But the arithmetic is nevertheless allowed (at least 
officially). I mixed up that sentence, because in the standard the 
conditions on the operations ++,--,etc. involving these iterators are 
often defined using the notion of dereferencing. For the ++ operation 
there is an exemption to the requirement for iterators to be 
dereferenceable.

Regards,
Jens