use c++ template implement printf

printf.cc

#include <iostream>
#include <string>

template <typename T> void printff(const char *s, const T &value) {
  while (*s) {
    if (*s == '%' && *++s != '%') {
      std::cout << value;
    }
    std::cout << *s++;
  }
}

template <typename T, typename... Args>
void printff(const char *s, const T &value, const Args &...args) {
  while (*s) {
    if (*s == '%' && *++s != '%') {
      std::cout << value;
      return printff(++s, args...);
    }
    std::cout << *s++;
  }
}

int main() {
  const char *msg = "The value of %s is about %g (unlesss you live in %s).\n";
  printff(msg, "pi", 3.1415, std::string("Indiana"));
  return 0;
}