Formatter.hpp

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#ifndef Formatter_CPP
#define Formatter_CPP

#include "common.hpp"
#include <fstream>

class Formatter
{
   public:
 
      template <class T> static void IntToStringBack( 
         T n, char* buffer, std::streamsize& pos );

      template <class T> static void IntToStringFront( 
         T n, char* buffer, std::streamsize& pos );

      static void SupportToStringBack( 
         counter_t support, char* buffer, std::streamsize& pos );

      template <typename InputIterator> static void ItemsetToStringBack( 
         InputIterator first, InputIterator last, char* buffer, 
         std::streamsize& pos );


   private: 
};
template <class T> inline void Formatter::IntToStringBack( 
   T n, char* buffer, std::streamsize& pos )
{
   if( n == 0 ) 
      buffer[--pos] = '0';
   else 
   {
      while( n > 0 ) 
      {
         buffer[--pos] = n % 10 + '0';
         n /= 10;
      }
   }
}

template <class T> inline void Formatter::IntToStringFront( 
   T n, char* buffer, std::streamsize& pos )
{
   if( n == 0 ) 
      buffer[pos++] = '0';
   else
   {
      size_t length=0;
      {
         register T n2(n);
         while(n2)
         {
            length++;
            n2 /= 10;
         }
      }
      char* buffer2 = buffer + pos + length -1;
      while(n) 
      {
         *buffer2-- = '0' + n%10;
         n /= 10;
      }
      pos += length;
   }     
}
inline void Formatter::SupportToStringBack( 
   counter_t support, char* buffer, std::streamsize& pos )
{
   buffer[--pos] = '\n';
   buffer[--pos] = ')';

   while (support > 0)
   {
      buffer[--pos] = support % 10 + '0';
      support /= 10;
   }
   buffer[--pos] = '(';
}

template <typename InputIterator> inline void Formatter::ItemsetToStringBack( 
   InputIterator first, InputIterator last, char* buffer, 
   std::streamsize& pos )
{
   while(last != first)
   {
      buffer[--pos] = ' ';
      --last;
      IntToStringBack(*last, buffer, pos);
   }
}



#endif

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