C++ helpers

helpers.cpp

class Random
{
private:
    function<int(void)> rnd;
public:
    Random() {
        auto rnde = default_random_engine();
        auto rndd = uniform_int_distribution<int>(
            numeric_limits<char>::min(),
            numeric_limits<char>::max());
        rnd = bind(rndd, rnde);
    }
    char operator () () { return rnd(); }
};

struct Range
{
    //teach the STL how to use our iterator
    typedef input_iterator_tag iterator_category; typedef long value_type; 
    typedef size_t size_type; typedef long difference_type;
    typedef value_type* pointer; typedef value_type& reference;
private:
    const long s; long i; const long e;
public:
    Range(long s, long e) : s(s), i(s), e(e) {}
    const Range & begin() const { return Range(s, e); }
    const Range & end() const { return Range(e, e); }
    const Range & operator ++ () { ++i; return *this; }
    bool operator == (const Range & other) const { return i == other.i; }
    bool operator != (const Range & other) const { return i != other.i; }
    long operator * () const { return i; }
};