#include <iostream>
#include <string>
#include <list>
// comparison, not case sensitive.
bool compare_nocase (const std::string &first, const std::string &second)
{
  unsigned int i = 0;
  while ( (i < first.length()) && (i < second.length()) ) 
  {
    if (::tolower(first[i]) < ::tolower(second[i])) return true;
    else if (::tolower(first[i]) > ::tolower(second[i])) return false;
    ++ i;
  }
  if (first.length() < second.length()) return true;
  else return false;
}

int main()
{
  std::list <std::string> mylist;
  mylist.push_back ("one");
  mylist.push_back ("two");
  mylist.push_back ("Three");

  // case sensitive (default)
  mylist.sort();
  std::list <std::string> :: iterator i = mylist.begin();
  std::list <std::string> :: iterator e = mylist.end();
  for (i; i != e; ++ i) {
    std::cout << " " << *i;
  }
  std::cout << std::endl;

  // Using the function, compare_nocase(), the comparison is made case insensitive.
  mylist.sort(compare_nocase);
  i = mylist.begin();
  e = mylist.end();
  for (i; i != e; ++ i) {
    std::cout << " " << *i;
  }

  return 0; // sort1.cpp
}
// Output:
// Three one two
// one Three two