Boost练习程序（multi_index_container）

代码来自：http://blog.csdn.net/whuqin/article/details/8482547

该容器能实现多列索引，挺好。

#include <string>
#include <iostream>
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/ordered_index.hpp>

using namespace boost;
using namespace boost::multi_index;
using namespace std;
struct Employee{
    int id;
    string name;
    int age;

    Employee(int id_,string name_,int age_):id(id_),name(name_),age(age_){}

    friend ostream& operator<<(ostream& os,const Employee& e)
    {
        os<<e.id<<" "<<e.name<<" "<<e.age<<endl;
        return os;
    }
};

typedef multi_index_container<
Employee,
indexed_by<
ordered_unique<member<Employee, int, &Employee::id> >,
ordered_non_unique<member<Employee, string, &Employee::name> >,
ordered_non_unique<member<Employee, int, &Employee::age> >
>
> EmployeeContainer;

typedef EmployeeContainer::nth_index<0>::type IdIndex;
typedef EmployeeContainer::nth_index<1>::type NameIndex;
typedef EmployeeContainer::nth_index<2>::type AgeIndex;

int main(){
    EmployeeContainer con;
    con.insert(Employee(0,"Joe",31));
    con.insert(Employee(1,"Robert",27));
    con.insert(Employee(2,"John",40));

    IdIndex& ids = con.get<0>();
    copy(ids.begin(),ids.end(), ostream_iterator<Employee>(cout));
    cout << endl;

    NameIndex& names = con.get<1>();
    copy(names.begin(), names.end(), ostream_iterator<Employee>(cout));
    cout << endl;

    //  names.erase(names.begin());

    AgeIndex& ages = con.get<2>();
    copy(ages.begin(), ages.end(), ostream_iterator<Employee>(cout));
    cout << endl;

    return 0;
}