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#include <iostream>
 
using namespace std;
 
int ff(int i) { return i; }
int fs(int i) { return i; }
 
struct X
{
    friend X ff(X x);
    static X fs(X x);
};
X ff(X x) { return x; }
X X::fs(X x) { return x; }
 
template<class T>
T ff2(T t) { return ff(t); }
 
template<class T>
T fs2(T t) { return fs(t); }
 
int main() {
    int i = 0;
    X x;
 
    ff2(i);
    ff2(x);
 
    fs2(i);
    fs2(x);
    return 0;
} 
 

prog.cpp: In instantiation of ‘T fs2(T) [with T = X]’:
prog.cpp:30:10:   required from here
prog.cpp:20:23: error: cannot convert ‘X’ to ‘int’ for argument ‘1’ to ‘int fs(int)’
 T fs2(T t) { return fs(t); }
                     ~~^~~

Standard output is empty