1.6.9 Variadic Templates

• Finally, there’s a way to write functions that take an arbitrary number of arguments in a type-safe way and have all the argument handling logic resolved at compile-time, rather than run-time.
  template<typename T> 
  T adder(T v) { 
    return v; 
  } 
   
  template<typename T, typename... Args> 
  T adder(T first, Args... args) { 
    return first + adder(args...); 
  } 
  //////////////////////////// 
  template<typename T> 
  show_list(const T& value){cout<<value<<endl;} 
   
  template<typename T, typename... Args> 
  show_list(const T& value, const Args&... args){ 
  cout<<value<<endl; 
  show_list(args...); 
  }