Orjan Westin wrote:
I have a question on the indirect_iterator, and what related standards say.
There is no standard that covers indirect_iterator as such.
I assume this class is primarily aimed for use in algorithms, which is fine. An algorithm typically dereference an iterator to do its thing, be it comparing or passing the dereferenced iterator on to a function or functor. This is great.
But it doesn't handle direct usage well.
??
If I have an indirect_iterator i for, say, a pointer to std::string, I cannot treat it as any other iterator to string and empty the string with this call: i->clear(); because the pointer operator is not changed. Instead you have to dereference it and use it as a reference: (*i).clear();
int main() { std::string s("Foo"); std::vector<std::string*> rgP; rgP.push_back(&s); boost::make_indirect_iterator(rgP.begin())->clear(); std::cerr << s << '\n'; } Works for me what did I miss?
Does anybody know if it does say anything on this subject, and why operator->() wasn't included in indirect_iterator?
It would be helpful if you would include compiler/platform boost version in your report. Regards Thomas -- Thomas Witt witt@acm.org