#include <iostream>
#include <type_traits>
 
template <typename T>
typename std::enable_if<std::is_integral<T>::value && std::is_signed<T>::value,
                        int>::type f()
{
    std::cout << "signed\n";
    return 42;
}
 
template <typename T>
typename std::enable_if<std::is_integral<T>::value && !std::is_signed<T>::value,
                        unsigned>::type f()
{
    std::cout << "unsigned\n";
    return 42;
}
 
 
int main() {
	f<int>();
	f<unsigned int>();
}

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