vectors vs. lists

[Simon Hausmann]

On Thursday 19 February 2004 10:46, Marc Mutz wrote:
[...]
> Tha janitorial job would involve finding wrong uses of QValueList and
> fixing them to use QValueVector.

When converting to from QValueList to QValueVector keep in mind that that 
QValueList's iterators have special properties:

1) Iterators remain valid as long as the item they point to exists. This is 
not the case with QValueVector, so after an insertion for example all 
existing iterators are invalid (in some cases they may remain valid, but it's 
nothing good to rely on) .

2) QValueList's linked list forms a circle, so if your iterator equals 
list.end() and you advance it then you are at the beginning again. Reverse 
applies of course to begin() . This is not the case with QValueVector's 
iterators.

Both are things that one can easily rely on by accident (think of loops that 
traverse a valuelist from the end to the beginning for example) . So just 
don't blindly replace QValueList with QValueVector and watch your code 
compile.

My humble opinion: Don't get scared. I don't think most of the time it's 
thaaat horrible. I guess it makes a difference in the total sum of it, but 
that part will get solved with much less effort with Qt 4.

Simon