#include <iostream>
#include <fstream>
#include <boost/tokenizer.hpp>
#include <string>
#include <vector>
#include <iterator>
#include <boost/lexical_cast.hpp>
using namespace std;
using namespace boost;
 
struct abc
{
  explicit abc( const string& line ) ;
  string x ;
  string y ;
  int z ;
  double w ;
};
 
abc::abc( const string& line )
{
   typedef tokenizer< escaped_list_separator<char> > tokenizer ;
   tokenizer toker(line);
   tokenizer::iterator iterator = toker.begin() ;
   x = *iterator++ ;
   y = *iterator++ ;
   z = lexical_cast<int>( *iterator++ ) ;
   w = lexical_cast<double>( *iterator ) ;
}
 
int main()
{
  const char* const file_name = "csv.txt" ;
  // assumes file has data for one abc per line:
  // string x, string y, integer z, double w (seperated by commas)
  // if x or y contain embedded commas, they would be quoted strings (' or ")
  ifstream file( file_name ) ;
  vector<abc> elements ;
  string line ;
  while( getline( file, line ) )
    elements.push_back( abc(line) ) ; // will throw if there are errors
}