C++ forwarding

#include <utility>
#include <iostream>

/* forwarded-to fn */
void f1(int& a) {
    std::cout << "forwarded to f1(int& a): " << a << std::endl;
}

/* forwarded-to fn */
void f1(int&& a) {
    std::cout << "forwarded to f1(int&& a): " << a << std::endl;
}

/* forwarding fn template */
template<class T>
void f0(T&& input) {
    std::cout << "f0() forwarding " << input << std::endl;
    f1(std::forward<T>(input));
}

int main()
{
    std::cout << "=== A section ===" << std::endl;
    int a = 55;
    f0(5);
    f0(a);

    std::cout << std::endl;
    std::cout << "=== B section ===" << std::endl;
    int b = 10;
    auto&& b1 = b;
    auto&& b2 = 11;
    f0(b1);
    f0(b2);
}