CEGUICommonFileDialog.h
//<snip>
    template<typename Z, class T>
    T getEntryFromHashMap (Z id, hash_map<Z, T>* hashMap)
    {
        // Search the entry in the hashMap
        if (hashMap)
        {
            typename hash_map<Z, T>::iterator hashMapIterator;
            hashMapIterator = hashMap->find (id);
            if (hashMapIterator != hashMap->end())
            {
                // Found it
                return hashMapIterator->second;
            }
        }

        return NULL;
    }
//<snip>

CEGUICommonFileDialog.cpp
//<snip>
    CCommonFileDialog::_Path* CCommonFileDialog::_getPathOfSelectedDrive (void)
    {
        String szDrive = _getCurrentDrive();
        _Path* path = getEntryFromHashMap (string(szDrive.c_str()), &_currentPaths);
        if (!path)
        {
            // No path found, add a new one
            path = new _Path ("");
            String szCurrentPath = _getWorkingPath();
            if (szDrive == _stripDrive(szCurrentPath))
                path->szAbsolutePath = szCurrentPath;
            else
                path->szAbsolutePath = szDrive;
        
            addEntryToHashMap (string(szDrive.c_str()), path, &_currentPaths);
        }
        
        return path;
    }
//<snip>