cc-mode C++ minor mode == broken tab key?

[Lucas (a.k.a T-Bird or bsdfan3)]

Why does my tab key not work in cc-mode any longer in the attached C++ 
source file?  I am using EMacs 21.2.1 on the latest Cygwin release on 
top of WNT 5.1.2600 SP2.
#include <map>
#include <string>
#include <fstream>

std::map <std::string, std::string> map_file_scanner (std::string pathpfx)
{
  std::map <std::string, std::string> retval;
  std::vector <std::string> maplist;
  for (std::vector <std::string>::iterator i = maplist.begin (); i < 
maplist.end (); i++)
    {
      std::fstream mf (pathpfx + "maps\" + *i, ios::in);