从csv文件读取数据到二维vector

void ReadDataFromCsv(std::string &filename, std::vector<std::vector<std::string> > &lines_feat) {
std::ifstream vm_info(filename.c_str());
std::string lines, var;
std::vector<std::string> row; lines_feat.clear(); while(!vm_info.eof()) {
getline(vm_info, lines);
if(lines.empty())
break;
std::istringstream stringin(lines);
row.clear(); while(std::getline(stringin, var, ',')) {
row.push_back(var);
}
lines_feat.push_back(row);
}
}