Re: Vector of iterators?
On Mar 15, 1:37 pm, Rune Allnor <all...@tele.ntnu.no> wrote:
On 15 Mar, 03:14, Yechezkel Mett <ymett.on.use...@gmail.com> wrote:
On Mar 11, 9:55 pm, Rune Allnor <all...@tele.ntnu.no> wrote:
class edge_t;
typedef std::vector<point_t>::iterator pi_t;
typedef std::vector<edge_t>::iterator ei_t;
struct egde_t {
pi_t origin;
ei_t next;
ei_t previous;
ei_t inverse;
};
If so, it might be possible to simplify the above dereference
to something like
point_t p = *(n.inverse().prev().origin);
point_t p = *(n->inverse->prev->origin);
Would this be guaranteed to work with the above declarations?
If so, iterators are a bit more flexible than I was aware.
Why not?
But I have just realised that you're instantiating the vector on
edge_t before it's defined, which the standard doesn't allow. I would
recommend just using pointers. You can get back from a pointer to an
iterator like this:
i = v.begin() + (p - &*v.begin());
where i is an iterator, v is a vector and p is a pointer. On the other
hand, I can't see anything useful an iterator would give you here over
a pointer.
Yechezkel Mett
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