C++ string split

stringsplit.cpp

//naive way to implement C++ string split
//In the worst case, it costs O(n^2) time
int split(string tokens[], string str, string d) {

    int i = 0;
    size_t n = str.length();
    
    if (d.length() > n || str.find(d) == string::npos) return -1;
    
    size_t pos;
    
    while (i < n && (pos = str.find(d)) != string::npos) {
        tokens[i] = str.substr(0, pos);
        str = str.substr(pos + 1);
        i++;
    }

    tokens[i] = str;
    
    return i + 1;
}