Boost logo

Boost :

From: Terje Slettebø (tslettebo_at_[hidden])
Date: 2002-10-13 09:55:55

>From: "Yitzhak Sapir" <yitzhaks_at_[hidden]>

>On Sun, 13 Oct 2002, [iso-8859-1] Terje Slettebø wrote:

>> >Fwiw, I've used --c.end() and am not sorry for it! :-)
>> If you do that on Intel C++ and STLPort for e.g. c=std::string, you get a
>> compile-time error, as c.end() is not a modifiable lvalue. :) In other
>> words, whether or not that work depends on the platform, and is therefore
>> not portable.

>What about boost::prior(c.end()) ?

I assume you mean the one in boost/utility.

It shouldn't make a difference, as it just copies it, and applies -- to the

As I understand, the only thing you can safely do with an end() iterator is
to compare it with other iterators. A tree class has been discussed
recently. Consider if you e.g. have begin() and end() defined like this:

iterator begin() { return iterator(root); }
iterator end() { return iterator(NULL); }

No amount of ++ or -- on such an end() iterator will make any kind of sense.
Yet, it works just fine for comparison with other iterators.



Boost list run by bdawes at, gregod at, cpdaniel at, john at