[DGD] Re: varargs int ...

[Michael McKiel]

 --- Erwin Harte <harte at is-here.com> wrote: 
> The only way I can see to be 100% sure what parameters were provided
> or not, is by using the ellipsis:
> 
>     string strstr(string str, int start, varargs mixed extra...) {
>         int end;
> 
>         if (sizeof(extra) == 0) {
>             /* No extra parameters provided. */
>         } else if (sizeof(extra) == 1 && typeof(extra[0]) == T_INT) {
>             /* Extra parameter was provided and was an integer. */
>             end = extra[0];
>         } else {
>             error("bad argument 3 to strstr");
>         }
>         ...
>     }
> 
> The next best thing is:
> 
>     string strstr(string str, int start, varargs mixed end) {
>         if (end == nil) {
>             /* Varargs parameter omitted or 'nil' value used. */
>         } else if (typeof(end) == T_INT) {
>             /* Extra parameter provided and was an integer. */
>         } else {
>             error("bad argument 3 to strstr");
>         }
>         ...
>     }
> 
> But then you can't distinguish between strstr("foo", 1, nil) and
> strstr("foo", 1).
> 
> If you don't care about that distinction, then by all means go ahead
> and use that approach. ;-)
> 
> Hope that helps,

Just to clarify, its a substr() function :), and yeah that helps a lot...
strangely enough I used the ellipses in a strcat() function but couldn't see
to use that in this instance.  -- Not that a strcat() is of any use, but a
number of them were more for figuring it out hehe.

Although I suppose 
if (substr(path, -2) == ".c") { path = substr(path, 0, -2); }

might look better than:
if (path[strlen(path)-3..] == ".c") { path = path[0..strlen(path)-3]; }

Anyways, thankee
Zamadhi

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