gistfile1.cpp

#include <iostream>
#include <vector>
#include <utility>
#include <string>
#include <sstream>

std::vector<std::pair<std::string, std::string> > 
parse_data (std::string const& data)
{
  std::vector<std::pair<std::string,std::string> > values;
  std::istringstream iss (data);

  std::string line;
  std::string key, value;

  while (std::getline (iss, line)) {
    std::istringstream inner_iss (line);

    if (std::getline (inner_iss, key, '=') && std::getline (inner_iss, value)) {
      values.push_back (std::make_pair (key, value)); 
    }   
  }

  return values;
}

int
main (int argc, char *argv[])
{
  typedef std::pair<std::string,std::string> StrPair;

  std::vector<StrPair> values = parse_data (
    "hello=world" "\n"
    "foo=bar"     "\n"
  );  

  for (std::vector<StrPair>::iterator it = values.begin (); it != values.end (); ++it) {
    std::cerr << it->first << " = " << it->second << std::endl;
  }
}