C++ explode

vector<string> explode(string str, string del)
{
    int slen = str.length();
    int dlen = del.length();
    int found_a;
    vector<string> final;
    vector<string> fail (0);
    if(dlen == 0) return fail;
    if(slen == 0) return fail;
    while(str.find(del) != string::npos)
    {
        final.push_back(str.substr(0, str.find(del)));
        str.erase(0, str.find(del) + dlen);
    }

    if(str.length() > 0)
    {
        final.push_back(str);
        str.erase(0, str.length());
    }

    return final;
}