range.cpp

// range(0-N) /*{{{*/

class NumberIterator : iterator<forward_iterator_tag, int> {
    public:
        int v;

        NumberIterator(int x) : v(x) {}

        operator int &() { return v; }

        int operator*() { return v; }
};
class range : pair<int,int> {
    public:
        range(int begin, int end) : pair<int,int>(begin, max(begin, end)) {}
        range(int n) : pair<int,int>(0, max(0, n)) {}
        NumberIterator begin() {
            return first;
        }
        NumberIterator end() {
            return second;
        }
};

// /*}}}*/