tuple、get、tie:
tuple<string, unsigned int, double> Human;//Human是新的数据类型
Human hujia("jiawei", 23, 56.23);
vector<Human> vecHuman;
cout<<get<0>(hujia)<<endl; //output:jiawei
string name;
unsigned int age;
double salary;
tie(name, age, salary) = hujia; //打包一起赋值