c++ strings

I'm not sure about how allocation and cleanup works with c++ strings. Does this leak memory?


string get_filename(char * path)
{
    string file_name = path;
    int pos = file_name.find_last_of('\\');
    if (pos!=string::npos)
    {
        file_name = file_name.substr(pos+1); // what happens to the memory here?
    }
    return file_name;
}

>>36
string remove_substring(string s, const string& t) {
    string::size_type i = s.find(t);
    if (i != string::npos)
        s.replace(i, t.length(), "");
    return s;
}