Ej4Chapter20C++

#include <iostream>

template<class T = int> struct char_traits : std::char_traits<char>
{
    typedef T char_type;
};

int main(void)
{
    std::basic_string<int, char_traits<int>> s1;
    printf("%i\n", *(s1.c_str()));
    return EXIT_SUCCESS;
}