123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119 |
- /* Boost.MultiIndex basic example.
- *
- * Copyright 2003-2013 Joaquin M Lopez Munoz.
- * Distributed under the Boost Software License, Version 1.0.
- * (See accompanying file LICENSE_1_0.txt or copy at
- * http://www.boost.org/LICENSE_1_0.txt)
- *
- * See http://www.boost.org/libs/multi_index for library home page.
- */
- #if !defined(NDEBUG)
- #define BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING
- #define BOOST_MULTI_INDEX_ENABLE_SAFE_MODE
- #endif
- #include <boost/multi_index_container.hpp>
- #include <boost/multi_index/member.hpp>
- #include <boost/multi_index/ordered_index.hpp>
- #include <algorithm>
- #include <iostream>
- #include <iterator>
- #include <string>
- using boost::multi_index_container;
- using namespace boost::multi_index;
- /* an employee record holds its ID, name and age */
- struct employee
- {
- int id;
- std::string name;
- int age;
- employee(int id_,std::string name_,int age_):id(id_),name(name_),age(age_){}
- friend std::ostream& operator<<(std::ostream& os,const employee& e)
- {
- os<<e.id<<" "<<e.name<<" "<<e.age<<std::endl;
- return os;
- }
- };
- /* tags for accessing the corresponding indices of employee_set */
- struct id{};
- struct name{};
- struct age{};
- /* see Compiler specifics: Use of member_offset for info on
- * BOOST_MULTI_INDEX_MEMBER
- */
- /* Define a multi_index_container of employees with following indices:
- * - a unique index sorted by employee::int,
- * - a non-unique index sorted by employee::name,
- * - a non-unique index sorted by employee::age.
- */
- typedef multi_index_container<
- employee,
- indexed_by<
- ordered_unique<
- tag<id>, BOOST_MULTI_INDEX_MEMBER(employee,int,id)>,
- ordered_non_unique<
- tag<name>,BOOST_MULTI_INDEX_MEMBER(employee,std::string,name)>,
- ordered_non_unique<
- tag<age>, BOOST_MULTI_INDEX_MEMBER(employee,int,age)> >
- > employee_set;
- template<typename Tag,typename MultiIndexContainer>
- void print_out_by(const MultiIndexContainer& s)
- {
- /* obtain a reference to the index tagged by Tag */
- const typename boost::multi_index::index<MultiIndexContainer,Tag>::type& i=
- get<Tag>(s);
- typedef typename MultiIndexContainer::value_type value_type;
- /* dump the elements of the index to cout */
- std::copy(i.begin(),i.end(),std::ostream_iterator<value_type>(std::cout));
- }
- int main()
- {
- employee_set es;
- es.insert(employee(0,"Joe",31));
- es.insert(employee(1,"Robert",27));
- es.insert(employee(2,"John",40));
- /* next insertion will fail, as there is an employee with
- * the same ID
- */
- es.insert(employee(2,"Aristotle",2387));
- es.insert(employee(3,"Albert",20));
- es.insert(employee(4,"John",57));
- /* list the employees sorted by ID, name and age */
- std::cout<<"by ID"<<std::endl;
- print_out_by<id>(es);
- std::cout<<std::endl;
- std::cout<<"by name"<<std::endl;
- print_out_by<name>(es);
- std::cout<<std::endl;
- std::cout<<"by age"<<std::endl;
- print_out_by<age>(es);
- std::cout<<std::endl;
- return 0;
- }
|