Equivalent C++ to Python generator pattern

Question

I\'ve got some example Python code that I need to mimic in C++. I do not require any specific solution (such as co-routine based yield solutions, although they would be acce

Answer 1

Something like this is very similar:

struct pair_sequence
{
    typedef pair result_type;
    static const unsigned int limit = numeric_limits::max()

    pair_sequence() : i(0), j(0) {}

    result_type operator()()
    {
        result_type r(i, j);
        if(j < limit) j++;
        else if(i < limit)
        {
          j = 0;
          i++;
        }
        else throw out_of_range("end of iteration");
    }

    private:
        unsigned int i;
        unsigned int j;
}

Using the operator() is only a question of what you want to do with this generator, you could also build it as a stream and make sure it adapts to an istream_iterator, for example.