efficient way to get key from std::map value

Question

I have a map as below :

std::map< std::string ,int> mapobj;
mapobj[\"one\"] = 1;
mapobj[\"two\"] = 2;
mapobj[\"three\"] =3 ;

how to g

Answer 1

I do notice that this has the "stdmap" tag, so this may not be appropriate. However Boost has boost::bimap<> which will allow you to do what you want: it allows lookup by either key or value.