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pair
template<class T, class U>
struct pair {
typedef T first_type;
typedef U second_type
T first;
U second;
pair();
pair(const T& x, const U& y);
template<class V, class W>
pair(const pair<V, W>& pr);
};
The template class stores a pair of objects, first, of type T, and second, of type U. The type definition first_type is the same as the template parameter T, while second_type is the same as the template parameter U.
The first (default) constructor initializes first to T() and second to U(). The second constructor initializes first to x and second to y. The third (template) constructor initializes first to pr.first and second to pr.second. T and U each need supply only a single-argument constructor and a destructor.