ATL / WTL / STL

typedef map<const string, string, less<string> > MapStr;
typedef pair<string, string> PAIR_KV;
                                                            
class FnObj
{
public:
    void operator() (const MapStr::iterator& it);
};
                                                            
int main()
{
    MapStr mapStr;
    // PopulateMap(mapStr);
    // DisplayMap(mapStr);
    MapStr::iterator iterB = mapStr.begin(), iterE = mapStr.end();
    for_each(iterB, iterE, FnObj());
    // DisplayMap(mapStr);
                                                            
    return 0;
}
                                                            
void FnObj::operator() (const MapStr::iterator& it)
{
    MapStr mapStr;
    PAIR_KV PAIR;
                                                            
    if((*it).first == "Old Key")     // essentially doing the 'find'
    {
        mapStr.erase(it);
        PAIR.first = "New Key";
        PAIR.second = "This is the value of the new key";
        mapStr.insert(PAIR_KV(PAIR.first, PAIR.second));
    }
}