preparing for const, final, and invariant

[antonio]

Chris Nicholson-Sauls wrote:
> bobef wrote:
>> Do you think that any user cares about if you use consts in your code 
>> or not? This is what I mean when I talk about usability. We write 
>> applications not code. We should focus on the usability. If it is 
>> easier to write - good, but the application is what is important, no 
>> the code (yes, of course it matters too). Plus what consts are you 
>> talking about in C++? Just cast them to void* and back to the type 
>> without const... If you want to modify it nothing is stopping you, if 
>> not just don't do it :)
>>
> 
> No, I don't think users care if I use const.  I do think they care if 
> the program runs quickly and is stable -- both of which const 
> contributes to, by avoiding unnecessary copies of data and pre-empting 
> bugs before they happen.  Yes I can use trickery and break the type 
> system to get around it -- but if I'm doing that, there's probably 
> something wrong with the design to begin with.  This /is/ aiding library 
> writers, and app writers. Once this is done, hopefully the major issues 
> will be the next to get attention.
> 
> I really don't think the console is going away anytime soon.  A friend 
> recently needed a new log parsing utility.  The one we tossed together 
> in an afternoon in D, on the console, finished within minutes -- 
> compared to the old (GUI) app he'd been using that took hours.  GUI 
> isn't always a blessing.  (All this program even need as input was a 
> filename. Adding GUI to something like that is merely bloat and slowdown.)
> 
> Usability is important, I agree.  But software that's quick and easy to 
> write, is also quicker and easier to /make/ usable.  And GUI isn't 
> always the answer to usability. That's my stance in a tiny overly 
> restrictive nutshell.  (Walnut?  Maybe pecan...)
> 
> -- Chris Nicholson-Sauls

May be, Walter could be centered solving bugs and closely working with 
debugger developpements (ddbg?).

anyway, "in" is a good hight level pogramming feature for people that 
uses D as hight level language (is expressive of an intention)