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#include <iostream>
#include <tuple>
 
using namespace std;
 
template <typename Ret, typename... Args>
tuple<Args...> m(Ret(Args...));
 
template <typename Ret, typename C, typename... Args>
tuple<Args...> m(Ret(C::*)(Args...));
 
void foo(char, short);
 
struct bar { void foo(char, short); };
 
int main() {
    decltype(m(foo)) test('a', 13);
    decltype(m(bar::foo)) test2('a', 13))
    cout << get<0>(test) << endl;
}

prog.cpp: In function 'int main()':
prog.cpp:18:21: error: invalid use of non-static member function 'void bar::foo(char, short int)'
     decltype(m(bar::foo)) test2('a', 13))
                     ^
prog.cpp:18:21: error: invalid use of non-static member function 'void bar::foo(char, short int)'
prog.cpp:18:40: error: expression list treated as compound expression in initializer [-fpermissive]
     decltype(m(bar::foo)) test2('a', 13))
                                        ^
prog.cpp:18:41: error: expected ',' or ';' before ')' token
     decltype(m(bar::foo)) test2('a', 13))
                                         ^

Standard output is empty