C++ High Performance

An example of a function with variadic number of arguments

If we were to create a function that makes a string out of any number of arguments without variadic template parameter packs, we would have to create a separate function for every number of arguments:

// Makes a string of by one argumenttemplate <typename T0> 
auto make_string(const T0& v0) -> std::string { 
  auto sstr = std::ostringstream{}; 
  sstr << v0; 
  return sstr.str(); 
} 
// Makes a string of by two arguments 
template <typename T0, typename T1> 
auto make_string(const T0& v0, const T1& v1) -> std::string { 
   return make_string(v0) + " " + make_string(v1); 
} 
// Makes a string of by three arguments 
template <typename T0, typename T1, typename T2> auto make_string(const T0& v0, const T1& ...