Re: nulliter
On Oct 28, 5:20 pm, Don Stock <d...@yahoo.com> wrote:
It would be most convenient if iterators had a standard value
"nulliter" that means "references nothing". I see that this topic has
been resurfacing for years, and the usual answers are "iterators
aren't pointers" and "use end()".
In the case of bi-directional iterators, we can decrement the end()
iterator and get back a valid (dereferencable) iterator.
$ cat iter.cc
#include <iostream>
#include <list>
int main() {
std::list<int> l;
l.push_back(1);
l.push_back(2);
std::list<int>::iterator i;
for ( i = l.begin(); i != l.end(); ++i ) {}
--i;
std::cout << *i << std::endl;
return 0;
}
$ CC iter.cc
$ ./a.out
2
$ CC -V
CC: Sun C++ 5.5 2003/03/12
$
Rgds,
anna
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