An implementation of mutual conversion between Map and string

#define KEY_SEG "[$]"
#define VAL_SEG "[#$%]"

template<typename T1, typename T2>

std::string map2String(const std::map<T1, T2>& mapIn,string key_seg,string val_seg)
{
    std::ostringstream oss;
     oss.str("");
    typename std::map<T1, T2>::const_iterator it = mapIn.begin();
    typename std::map<T1, T2>::const_iterator itEnd = mapIn.end();
    for(; it != itEnd; it++)
    {
        oss<< it->first << key_seg << it->second << val_seg;
    }
return oss.str();
}

template<typename T1, typename T2>    
int string2Map(const string& strIn, map<T1, T2>& mapOut,string key_seg,string val_seg)
{
     if (strIn.empty()) 
    {
        return -1;
    }
    vector<string> vElement = TC_Common::sepstr<string>(strIn, string(val_seg));
    for(unsigned int i=0; i<vElement.size(); i++)
    {
    string::size_type pos = vElement[i].find(key_seg);
        mapOut[TC_Common::trim(vElement[i].substr(0, pos), " ")] = TC_Common::trim(vElement[i].substr(pos+1), " ");
    }     return 0; }