Template for string conversion with padding and prefix facility

gistfile1.cpp

#include <iostream>
#include <sstream>
#include <string>
#include <limits>

using namespace std;

template <class T> std::string to_string(T t, ios_base & (*f)(ios_base&), std::string prefix = "", bool pad = true)
{
  std::ostringstream oss;
  if(pad) {
    oss.fill('0');
    oss.width(std::numeric_limits<T>::digits/4);
  }
  oss << f << t;
  prefix += oss.str();
  return prefix;
}