C++ 常用字符串分割split函数和trim函数

void split(const string &str, vector<string> &res, const char pattern)
{
        istringstream is(str);
        string temp;
        while (getline(is, temp, pattern))
        {
                if (temp.length() != 0)
                {
                        res.push_back(temp);
                }
        }
                
        return;
}


void trim(std::string &s) 
{
        if (s.empty())
                return;
        s.erase(0, s.find_first_not_of(" "));
        s.erase(s.find_last_not_of(" ") + 1);
}