On Feb 16, 2012, at 9:31 PM, Joe Neeman wrote:
>
> On Thu, Feb 16, 2012 at 3:14 AM, [email protected]
> <[email protected]> wrote:
>
> On Feb 16, 2012, at 11:40 AM, [email protected] wrote:
>
> >
> > The buildings are in increasing order, so this should work:
> >
> > Real last_end = -infinity_f;
> > for (...)
> > {
> > if (i->y_intercept_ > -infinity_f)
> > return last_end;
> > last_end = i->end_;
> > }
> > return infinity_f;
> >
>
> Hey,
>
> I know this is a lame question, but how would one write the reverse iterator.
> I tried using reverse_iterator and g++ barfs, and I can't use the same
> syntax one would use in a for loop w/ a vector.
>
> That's a bit hard to say without knowing what you tried... did you use
> rbegin() and rend()?
>
Yup - I more or less copied the example from cplusplus.com. As an experiment,
try writing a reverse iterator in that file to the tune of:
for (list<Building>::reverse_iterator i = buildings_.rbegin (); i !=
buildings_.rend (); ++i)
Anywhere in a function. You should see a compiler error.
I fixed it, though, by reversing a copy of the list and iterating forward
through it.
Cheers,
MS
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