gistfile1.txt

#include <iostream>
#include <string>

struct F
{
    int x, e, t, f;
    F(int n, int i = 1) : x(i), e(n), t(1), f(1) {}
    F begin() { return F(e); }
    F end() { return F(e, e); }
    F &operator++()
    {
        x++;
        t = (t + 1) % 3;
        f = (f + 1) % 5;
        return *this;
    }
    bool operator!=(F o) { return x != o.x; }
    std::string operator*()
    {
        return (t && f) ? std::to_string(x) : !t && !f ? "fizzbuzz" : !t ? "fizz" : "buzz";
    }
};

F fizzbuzz(int n) { return F(n); }

int main(int argc, char **argv)
{
    size_t n = 1000;
    for (std::string s : fizzbuzz(n))
    {
        std::cout << s << std::endl;
    }
    return 0;
}