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#include <string>
#include <iostream>
 
 
template<typename T>
struct Base
{
  void foo(const T&) {
    std::cout << __PRETTY_FUNCTION__ << std::endl ;
  }
 
};
 
template <typename ...Args>
struct Magic : public Base<Args>... { };
 
int main (void)
{
  Magic<int, std::string> magic ;
 
  int i = 1;
  magic.foo(i) ;
  std::string s="s" ;
  magic.foo(s) ;
 
  return 0 ;
 
}
 

prog.cpp: In function 'int main()':
prog.cpp:22:9: error: request for member 'foo' is ambiguous
   magic.foo(i) ;
         ^
prog.cpp:8:8: note: candidates are: void Base<T>::foo(const T&) [with T = std::basic_string<char>]
   void foo(const T&) {
        ^
prog.cpp:8:8: note:                 void Base<T>::foo(const T&) [with T = int]
prog.cpp:24:9: error: request for member 'foo' is ambiguous
   magic.foo(s) ;
         ^
prog.cpp:8:8: note: candidates are: void Base<T>::foo(const T&) [with T = std::basic_string<char>]
   void foo(const T&) {
        ^
prog.cpp:8:8: note:                 void Base<T>::foo(const T&) [with T = int]

Standard output is empty