unordered_map pair of values c++

I am trying to use the unordered_map in C++, such that, for the key I have an int, while for the value there is a pair of floats. But, I am not sure how to access the pair of values. I am just trying to make sense of this data structure. I know to access the elements we need an iterator of the same type as this unordered map declaration. I tried using iterator->second.first and iterator->second.second. Is this the correct way to do access elements?

typedef std::pair<float, float> Wkij;
tr1::unordered_map<int, Wkij> sWeight;
tr1::unordered_map<int, Wkij>:: iterator it;
it->second.first     //  access the first element of the pair
it->second.second    //  access the second element of the pair

Thanks for your help and time.