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#include <iostream>
 
using namespace std;
 
class Foo {
public:
    void bar(int) { cout << "bar" << endl; }
};
 
template< class T, typename ...Args, void(T::*Member)(Args...) >
void member_dispatch(Args&&... args, void* userdata)
{
    T* obj = static_cast<T*>(userdata);
    (obj->*Member)(std::forward<Args>(args)...);
}
 
int main()
{
    Foo foo;
    member_dispatch<Foo, int, &Foo::bar>(1, &foo);
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:20:49: error: no matching function for call to ‘member_dispatch(int, Foo*)’
     member_dispatch<Foo, int, &Foo::bar>(1, &foo);
                                                 ^
prog.cpp:11:6: note: candidate: template<class T, class ... Args, void (T::* Member)(Args ...)> void member_dispatch(Args&& ..., void*)
 void member_dispatch(Args&&... args, void* userdata)
      ^~~~~~~~~~~~~~~
prog.cpp:11:6: note:   template argument deduction/substitution failed:

Standard output is empty