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#include <string>
 
template <typename Callable>
int fujitsu(Callable callable) {}
 
int main() {
    fujitsu(std::stoi);
}

prog.cpp: In function 'int main()':
prog.cpp:7:22: error: no matching function for call to 'fujitsu(<unresolved overloaded function type>)'
     fujitsu(std::stoi);
                      ^
prog.cpp:7:22: note: candidate is:
prog.cpp:4:5: note: template<class Callable> int fujitsu(Callable)
 int fujitsu(Callable callable) {}
     ^
prog.cpp:4:5: note:   template argument deduction/substitution failed:
prog.cpp:7:22: note:   couldn't deduce template parameter 'Callable'
     fujitsu(std::stoi);
                      ^

Standard output is empty