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#include <iostream>
#include <vector>
#include <string>

template < typename Type1 , typename Type2 >
struct pointer_pair
{

pointer_pair ( Type1 * pFirst )
        : first ( pFirst )
        , second ( nullptr )
    {
    }

pointer_pair ( Type2 * pSecond )
        : first ( nullptr )
        , second ( pSecond )
    {
    }
    Type1 * first ;
    Type2 * second ;
};

template < typename T1, typename T2 >
std::ostream & operator << ( std::ostream & stream , const pointer_pair<T1,T2> & obj )
{
    if ( obj.first )
        stream << *obj.first ;
    else if ( obj.second )
        stream << *obj.second ;
    return stream ;
}

template < typename T >
std::ostream & operator << ( std::ostream & stream , const std::vector<T> & vec )
{
    for ( const auto & e : vec )
        stream << e << '\n' ;
    return stream ;
}

int main()
{
    std::vector < pointer_pair < std::string , double > > vec ;
    vec.push_back ( { new std::string("my string 1") } ) ;
    vec.push_back ( { new std::string("my string 2") } ) ;
    vec.push_back ( { new double(3.14) } ) ;
    vec.push_back ( { new std::string("my string 3") } ) ;
    vec.push_back ( { new double(-0.23) } ) ;
    std::cout << vec << std::endl ;
}

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Compilation time: 0.52 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.67 sec