læse gennem en fil

Kode 

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>

bool Split(std::string &aDest, std::string &aSrc, char aDelim)
{
   if(aSrc.empty())
      return false;
   std::string::size_type pos = aSrc.find(aDelim);
   aDest = aSrc.substr(0, pos);
   if(pos != std::string::npos)
     aSrc = aSrc.substr(pos + 1);
   else
     aSrc = "";

   return true;
}

template <typename T>
bool FromString(T &aValue, const std::string &aStr)
{
   std::stringstream ss(aStr);
   return ss >> aValue;
}

class Info
{
public:
   Info() { Clear(); }
   void Clear() { Name = ""; n1 = n2 = 0; }
   std::string Name;
   int n1;
   int n2;
};

int main()
{
   std::ifstream In("animal.txt");
   std::string Line;
   Info info;
   std::string Name;
   bool First = true;
   while(std::getline(In, Line))
   {
      if(Split(Name, Line, ','))
      {
         if(Name != info.Name)
         {
            if(!First)
            {
               std::cout << info.Name << ", " << info.n1 << ", " << info.n2 << std::endl;
               info.Clear();
            }
            else
            {
               First = false;
            }
            info.Name = Name;
         }
         int n;
         Split(Name, Line, ',');
         FromString(n, Name);
         info.n1 += n;
         FromString(n, Line);
         info.n2 += n;
      }
   }
   std::cout << info.Name << ", " << info.n1 << ", " << info.n2 << std::endl;
}