c++ question.

[Tomaz Canabrava]

On Thursday 02 September 2010 16:54:19 Jaime wrote:
> Hi,
>   I do not know what this methods do,
>   They use a [-1] array index, perhaps to do pointer arithmetic?, but

no pointer aritimetic. it's just that the -1 is actually the biggest number 
you can find using an unsigned int. so, it's 0xFFFFFFFFFFFFFFFFFFF ( or 
something near =p )

instead of hardcoding the biggest number that you may find, since they change 
depending on the hardware, -1 will always be it.

Tomaz
> I do not know, it is the first time I see negative indexes in C++
> arrays.
> 
> They are in kdebase/runtime/kioslave/man/man2html.cpp
> lines 2845, 3166, 3661, 3693, 3732, 3791, 4067 and 4163.
> Here you have an extract:of the first case...
> 
>     char *wordlist[max_wordlist];
>     fill_words(c, wordlist, &words, true, &c);
>     for (int i=0; i<words; i++)
>     {
>         if ((mode) || (inFMode))
>         {
>             out_html(" ");
>             curpos++;
>         }
>         wordlist[i][-1]=' ';        <---------------- The unknown thing for
> me out_html( set_font( (i&1) ? font2 : font1 ) );
>         scan_troff(wordlist[i],1,NULL);
>     }
> 
> Best Regards.