on Sat Aug 30 2008, Steven Watanabe <watanabesj-AT-gmail.com> wrote:
How would this work:
template<IteratorWithEnd Iterator, class F> class filter_iterator<Iterator, F> { public: //... filter_iterator(Iterator begin, Iterator end, F f) : iter(set_end(begin,end)), f(f) {}
filter_iterator& operator++() { ++iter; while(iter != get_end(iter) && !f(*iter)) ++iter; return *this; }
friend Iterator get_end(const filter_iterator& self) { return filter_iterator( get_end(self.iter), get_end(self.iter), self.f); }
friend Iterator set_end( const filter_iterator& self, const filter_iterator& other) { return filter_iterator(self.iter, get_end(other.iter), f); }
private: Iterator iter; F f; };
Hi Steven, Say for example Iterator is strided_iterator<int>. Then the return type of set_end above is strided_iterator<int>, right? So how will its body typecheck? Seems like this needs a little more thought. PS: I suggest you use more linebreaks, at least in your postings; code with linebreaks inserted by mailers is even harder to read than code with too few linebreaks ;-) -- Dave Abrahams BoostPro Computing http://www.boostpro.com