#include <vector>
#include <iostream>
#include <chrono>


void bench(size_t iterations, std::function<void ()> func)
{

    using namespace std::chrono;

    auto start = high_resolution_clock::now();
    for(size_t i = 0; i < iterations; ++i)
    {
        func();
    }
    auto stop = high_resolution_clock::now();

    nanoseconds duration = stop - start;

    std::cout << "Ran " << iterations << " iterations, which took " <<
              duration.count() << "ns" << std::endl;

    if(iterations>1)
    {
        std::cout << "Which is " << duration.count()/iterations << "ns per iteration " << std::endl;
    }

}

class range {
    int b, e;
public:

    class iterator
    {
        int value;
    public:
        iterator(int v) : value(v) {}
        bool operator==(const iterator& other) const { return value == other.value; }
        bool operator!=(const iterator& other) const { return value != other.value; }
        const iterator& operator++() { value++; return *this; }
        const iterator& operator--() { value--; return *this; }
        int operator*() const { return value; }
    };

    range(int b_, int e_) : b(b_), e(e_) {}
    iterator begin() { return b; }
    iterator end() { return e+1; }
};

int main()
{

    int ITER = 10000;

    bench(ITER, [](){

        int sum = 0;
        for( auto i : range(1,1000) )
        {
            sum += i;
        }

        });

    bench(ITER, [](){

        int sum = 0;
        for(int i = 1; i < 1000; ++i)
        {
            sum += i;
        }

        });



    return 0;
}