笔记：boost:: multi_index_container

boost::multi_index_container 作用：创建一种提供索引的数据结构，快速查询。

ordered_unique，索引。唯一值

composite_key， 排序的key,

composite_key_comare,排序方式，传入自定义排序方法。

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


#include <boost/tuple/tuple.hpp>
#include <boost/tuple/tuple_comparison.hpp>

struct Operation_type{
    int time;
    friend  bool operator < (const Operation_type &op1, const Operation_type &op2){
        return op1.time < op2.time;
    }
};

typedef struct  {
    std::string name;
    unsigned int age;
    unsigned int heigth;
    unsigned int num;
    Operation_type op;
}student;

//自定义排序
struct CmpByKeyLength {
    bool operator()(const Operation_type& k1, const Operation_type& k2) const {
        ret