Proposal of a general do-while loop [more generic and tested

[Steve Teale]

Bruno Medeiros Wrote:

> downs wrote:
> > Here's a more generic version. This one was tested and shown to work.
> > Have fun with it!
> >  --downs
> > =======================================================================
> > import std.stdio, std.string;
> > 
> > /// Cond is
> > void doWhile(P, C, O)(lazy P pre, lazy C cond, lazy O post) {
> >   while (true) {
> >     static if (is(P==void delegate())) pre()(); else pre();
> >     if (!cond()) break;
> >     static if (is(O==void delegate())) post()(); else post();
> >   }
> > }
> > 
> > // these are the things stupid std.string forces us to do.
> > // Tango, with str.length==NOTFOUND, really picked the better approach.
> > int find(char[] str, char[] match, int offset) {
> >   auto res=std.string.find(str[offset..$], match);
> >   if (res==-1) return -1;
> >   return res+offset;
> > }
> > 
> > void main() {
> >   int pos=0;
> >   auto text="This interestingly works.";
> >   // Note the way we can switch between using brackets and not using them.
> >   doWhile(
> >     pos=text.find("i", pos),
> >     pos+1, /// equivalent to pos!=-1, except it also demonstrates
> >            /// that the conditional can be anything "if" can use.
> >     { writefln("Hit at ", pos); ++pos; }
> >   );
> > }
> 
> The usage can also be:
> 
>    doWhile(
>      pos=text.find("i", pos),
>      pos+1,
>      (writefln("Hit at ", pos), ++pos )
>    );
> 
> Only one char less though :P
> 
> 
> -- 
> Bruno Medeiros - MSc in CS/E student
> http://www.prowiki.org/wiki4d/wiki.cgi?BrunoMedeiros#D

Do we need moderators on this group, or are there just a lot of people around who have more time than things to do.

Kill this thread, it's a waste of Oxygen.

Steve Teale - No qualifications whatsoever, but been doing it since 1965.