LtoA and StringStreams

c_style.cc

#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <string>

using std::string;

char* 
ltoa(long value, char* buf, const long& base)
{
  memset(buf, '\0', 12);
  
  long cnt = 12 - 1;
  buf[cnt] = '\0';

  bool is_negative = (value < 0);
  do 
    {
      buf[--cnt] = (value % base)  + '0';
      value /= base;
    }
  while(value);

  int q = (is_negative) ? 1 : 0;
  do 
    {
      if (buf[q] != '\0')
        {
          memmove(buf, &buf[q], (12-1)-q);
          memset(&buf[(12-1)-q], '\0', q);
          break;
        }
    }
  while(++q < (12 - 1));

  return buf;
}

int 
main(int argc, char* argv[])
{
  char buf[12];
  
  for (long i = 0; i < 4000000; ++i)
    {
      string q = ltoa(i, buf, 10);
    }

}

cpp_style.cc

#include <string>
#include "osstream2.h"

using std::string;

int 
main(int argc, char* argv[])
{
  for (long i = 0 ; i < 4000000; ++i)
    {
      ostringstream2 strm;
      string q = (strm << i).str();
    }
}

osstream2.h

#ifndef OSSTREAM2_H_
#define OSSTREAM2_H_

#include <sstream>

using std::ostringstream;

class ostringstream2 : private ostringstream 
{
public:
  using ostringstream::str;

  template <class T>
   friend ostringstream2& operator<<(ostringstream2& os, T value)
     {
       static_cast<ostringstream&>(os) << value;
       return os;
     }
};

#endif //OSSTREAM2_H_