Proposal of a general do-while loop

[Manfred Nowak]

Taro Kawagishi wrote

> I think a more natural way to express the logic is to write the
> code as in listing 4. 
> 
>     // listing 4
>     size_t pos = 0;
>     do {
>         pos = text.find(pattern, pos);
>     } while (pos != string::npos) {
>         cout << "pattern found at " << pos << "\n";
>         ++pos;
>     }
> 

Where is the problem with using `for'?

    for( size_t pos= 0
       ; ( pos = text.find(pattern, pos),  pos != text.length)
       ; pos++
       )
    {
      writefln( "pattern found at %s",  pos) ;
    }

-manfred