On Feb 7, 5:20 pm, "Daniel T." <danie...@earthlink.net> wrote:
> James Kanze <james.ka...@gmail.com> wrote:
> > Reetesh Mukul <reetesh.mu...@gmail.com> wrote:
> > > "Daniel T." <danie...@earthlink.net> wrote:
> > > > ReeteshMukul <reetesh.mu...@gmail.com> wrote:
>
> > > > > Actually, I assumed that numeric-digits will appear
> > > > > surrounded by space.
>
> > > > I still don't see why you had to make the procedure so
> > > > complex.
>
> > > > Your code is emulated by the code below, which is far simpler:
>
> > > > int main()
> > > > {
> > > > std::string s = "dsdhjsahdk dsdjdsaj 36782367 sdjdhak";
>
> > > > int result = 0;
> > > > std::stringstream cstr( s );
> > > > char ch = 0;
> > > > while ( cstr >> ch && !isdigit( ch ) )
> > > > cstr.ignore( numeric_limits<streamsize>::max(), ' ' );
> > > > cstr.putback( ch );
> > > > cstr >> result;
> > > > cout << result;
> > > > }
>
> > > Yes, this is a great solution. Very simple and compact solution.
>
> > It fails if the separator is a tab, rather than a space.
>
> The code has lots of assumptions and it fails if any of them don't hold,
> that's not the point.
>
> The question I asked Reetesh was why he had such a complex solution when
> the above solution, which is far simpler, does the exact same thing. I'm
> guessing that it was because he didn't know about the 'ignore()'
> member-function, and didn't know that the putback and op>> would do the
> "right thing" if the stream failed.

Yes, you are right Daniel. I indeed didn't knew about 'ignore()' and
putback,op's mechanism after things fail. Now an obvious question is
popping in my mind, will it not be good to have predicates( functors )
in ignore function (or similar functions) ?

Regards,
Reetesh Mukul