C++文件读写——字符串分割

void String_Split(std::string s, std::string delim, std::vector&ans) {
        std::string::size_type pos_1, pos_2 = 0;
        while (pos_2 != s.npos) {
            pos_1 = s.find_first_not_of(delim, pos_2);
            if (pos_1 == s.npos)break;
            pos_2 = s.find_first_of(delim, pos_1);
            ans.push_back(s.substr(pos_1, pos_2 - pos_1));
        }
    }

std::vectorsplit(std::string s, char token){
    std::stringstream iss(s);
    std::string word;
    std::vectorvs;
    while(getline(iss,word,token)){
        vs.push_back(std::atof(word.c_str()));
    }
    return vs;
}

bool getSubstr(std::string string_in, char char1, char char2, std::string &sub_get, std::string &a