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template <std::string * temp> //pointer to object
void f()
{
   cout << *temp << endl;
}
 
template <std::string & temp> //reference to object
void g()
{
     cout << temp << endl;
     temp += "...appended some string";
}
 
std::string s; //must not be local as it must have external linkage! WHY???
 
int main() {
        s = "can assign values locally";
        f<&s>();
        g<s>();
        cout << s << endl;
        return 0;
}

prog.cpp:1: error: ‘std::string’ has not been declared
prog.cpp: In function ‘void f()’:
prog.cpp:4: error: ‘cout’ was not declared in this scope
prog.cpp:4: error: ‘endl’ was not declared in this scope
prog.cpp: At global scope:
prog.cpp:7: error: ‘std::string’ has not been declared
prog.cpp: In function ‘void g()’:
prog.cpp:10: error: ‘cout’ was not declared in this scope
prog.cpp:10: error: ‘endl’ was not declared in this scope
prog.cpp: At global scope:
prog.cpp:14: error: ‘string’ in namespace ‘std’ does not name a type
prog.cpp: In function ‘int main()’:
prog.cpp:17: error: ‘s’ was not declared in this scope
prog.cpp:18: error: no matching function for call to ‘f()’
prog.cpp:19: error: ‘s’ cannot appear in a constant-expression
prog.cpp:19: error: no matching function for call to ‘g()’
prog.cpp:20: error: ‘cout’ was not declared in this scope
prog.cpp:20: error: ‘endl’ was not declared in this scope

Standard output is empty