C++中如何分割字符串

std ::vector <std:: string >&  split(const std:: string &s , char delim, std ::vector <std:: string > &elems ) {
std ::stringstream ss(s);
std ::string item;
while (std ::getline( ss , item , delim)) {
elems .push_back (item);
}
return elems ;
}
std ::vector <std:: string >  split(const std:: string &s , char delim) {
std ::vector <std:: string > elems ;
split (s , delim, elems );
return elems ;
}