C++ string 字符串的分割

//字符串分割函数
vector<string> split(string str, string pattern)
{
    string::size_type pos;
    vector<string> result;
    str += pattern;//扩展字符串以方便操作
    int size = str.size();

    for (int i = 0; i < size; i++)
    {
        pos = str.find(pattern, i);
        if (pos < size)
        {
            std::string s = str.substr(i, pos - i);
            result.push_back(s);
            i = pos + pattern.size() - 1;
        }
    }
    return result;
}