#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>

template <typename T>
class SequenceGenerator {
public:
    SequenceGenerator(T istart = T(), T istep = 1) :
        start(istart), step(istep) {}
    T operator()() {
        T temp = start;
        start += step;
        return temp;
    }
private:
    T start; // the start value of the sequence
    T step;  // the step
};

using namespace std;

int main() {
    vector<int> v(10); // allocate 10 elements

    /*
     * Output: 10 15 20 25 30 35 40 45 50 55
     */
    generate(v.begin(), v.end(), SequenceGenerator<int>(10, 5));
    copy(v.begin(), v.end(), ostream_iterator<int>(cout, " "));
    cout << endl;

    /*
     * Output: 5 6 7 8 9 10 11 12 13 14
     */
    generate(v.begin(), v.end(), SequenceGenerator<int>(5));
    copy(v.begin(), v.end(), ostream_iterator<int>(cout, " "));
    cout << endl;

    /*
     * Output: 0 1 2 3 4 5 6 7 8 9
     */
    generate(v.begin(), v.end(), SequenceGenerator<int>());
    copy(v.begin(), v.end(), ostream_iterator<int>(cout, " "));
    cout << endl;

    /*
     * Output: abcd...xyz
     */
    vector<char> chars('z' - 'a' + 1);
    generate(chars.begin(), chars.end(), SequenceGenerator<char>('a'));
    copy(chars.begin(), chars.end(), ostream_iterator<char>(cout));
    cout << endl;
}