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        The TR1
        Tuple interface is specified to provide uniform access to std::pair
        as if it were a 2 element tuple.
      
tuple_size<std::pair<T1, T2> >::value
Type: An MPL Integral Constant
Value: Returns 2, the number of elements in a pair.
tuple_element<0, std::pair<T1, T2> >::type
        Type: T1
      
Value: Returns the type of the first element of the pair
tuple_element<1, std::pair<T1, T2> >::type
        Type: T2
      
Value: Returns the type of the second element of the pair
template<int I, typename T1, typename T2> P& get(std::pair<T1, T2>& pr); template<int I, typename T1, typename T2> const P& get(const std::pair<T1, T2>& pr);
        Type: If I
        == 0
        P is T1,
        else if I ==
        1 P
        is T2 else the program is
        ill-formed.
      
        [*Returns: pr.first if I
        == 0
        else pr.second.