Question

Following java method returns keys of hashtable as Enumeration.

Hashtable<String, Object> props = new Hastable<String, Object>(); 

// some code here

public final Enumeration getPropertyURIs() {
    return props.keys();
}

I want to translate this code to C++.

More specifically, how can I implement the same function in C++ which returns enum of keys of std::map?

Answer 1

An enum in C++ is just a collection of constants.

Do you mean something like this, perhaps?

typedef std::unordered_map<std::string, boost::any> props_t;
props_t props;

std::vector<std::string> getPropertyURIs()
{
   std::vector<std::string> keys;
   for (props_t::const_iterator i = props.begin(); i != props.end(); ++i)
   {
      keys.push_back(i->first);
   }
   return keys;
}