On 23/10/2011, at 1:14 AM, Andre Somers wrote:

Op 22-10-2011 15:52, Dhaivat Pandya schreef:

Craig,

Do have any part of this class implemented? If its, people can test it and see 
if it actually meets the users needs.
2011/10/22 Thiago Macieira <[email protected]<mailto:[email protected]>>
On Saturday, 22 de October de 2011 11:29:38 
[email protected]<mailto:[email protected]> wrote:
> With that out of the way, I've put the class definition up on pastebin for
> comment. I've withheld the implementation until I've had a chance to clear
> it with our legal people. In the meantime, I think the interface of the
> class is probably enough to get some feedback on whether people think this
> has the potential to be a viable candidate for a command line parser for
> Qt:
>
Seems to me Craigs message was clear: yes, there is an implementation, but no, 
it is not available to the public for the time being because such a release 
must go through the companies legal department. Sounds reasonable to me.

I have my doubts on the API. I don't really like the fact that subclassing is 
needed to use it. I prefer a solution where basic validation is build in, and 
more extended validation is possible (subclassing is OK to me for that case, 
but you could also considder a pattern like how QValidator is used.)

What do you mean by basic validation? The code you include in Qt cannot know 
what each of your flags mean, so only you can implement validation on whether 
or not the flags and arguments form a sane combination. We started out thinking 
along a similar line, but it turns out there's not really anything that the 
base class can validate! Since arguments and flags can be intermingled, you 
can't even test whether a multi-parameter flag has all required parameters 
unless it is the last one on the command line (which is about the only thing I 
think the base class can actually validate for you).

Not sure what your point is with the QValidator approach, since it uses the 
same approach as the class I proposed. QValidator has a pure virtual validate() 
function too! If you mean that there are a couple of standardish subclasses of 
QValidator provided, I come back to my above point that there isn't really much 
you can pre-build as far as flag/argument validation is concerned. Anything 
that isn't recognised as a flag is treated as an argument, so there's not much 
left to validate automatically.


--
Dr Craig Scott
Computational Software Engineering Team Leader, CSIRO (CMIS)
Melbourne, Australia



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