#include <map>
#include <string>

using std::map;
using std::string;

typedef map<int, string> BaseMap;

class StaticMap: public BaseMap
{
public:
  StaticMap ()
    : BaseMap ()
  {
    (*this) [ 0 ] = string ("ABC");
    (*this) [ 1 ] = string ("DEF");
    (*this) [ 2 ] = string ("GHI");
  }
  // 
  // *1
  //
  string& operator[] (const int& i)
  {
    return BaseMap::operator[] (i);
  }
  //
  // *2
  //
  int operator[] (const string& s) const
  {
    for (const_iterator i = begin (); i != end (); i++)
      if (i -> second == s)
        return i -> first;

    return - 1 ;
  }
};

int main(void)
{
  StaticMap aMap;
  string s = aMap [ 10 ];
  int k = aMap [string ("DEF")];
  
  return  0 ;
}

error C2440: '=' : cannot convert from 'std::basic_string<_Elem,_Traits,_Ax>' to 'int'	c:\...\maptest.cpp  20 
error C2679: binary '[' : no operator found which takes a right-hand operand of type 'int' (or there is no acceptable conversion)	c:\...\maptest.cpp  21