vector-range.h

#include <vector>


class range {
  public:
    typedef std::vector<long>::const_iterator const_iterator;
     
    range(long end) : range(0, end) {}
    range(long begin, long end, long step = 1) {
        long diff = end - begin;
         
        if ((diff > 0 && step > 0) ||
            (diff < 0 && step < 0)) {
            while(begin != end) {
                range_.push_back(begin);
                 
                begin += step;
            }
        }
    }
     
    const_iterator begin() const {
        return range_.begin();
    }
     
    const_iterator end() const {
        return range_.end();
    }
     
private:
    std::vector<long> range_;
};