Lars Gullik Bjønnes wrote:
> char a[] = "Lars";
> a[-1] yields what? AFAIK the implementation is allowed to crash.
>
Dead sure it can crash if you _access_ a[-1], but this doesn't takes out the
fact that you can compare &a[-1] with some iterator (and it will not
crash).
It's the same thing as:
vector<int> a(10);
if(&a[11] == &*a.end())
cout << "yes" << endl;
This does _not_ crash and prints yes (and in fact is perfectly valid and can
even be useful). The vector::end() iterator points to an invalid position
(i.e. cout << a[11] does crash) and it's not less useful for that. The same
thing happends for rend() and rbegin(), they can point to invalid
positions.
Regards, Alfredo
