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179b5def1e
* removed simulated variadic function args * removed detail/allocator_traits.hpp in favor of Boost.Core functionality * removed usage of Boost.Move * avoided pessimizing-move warnings * removed usage of BOOST_DEDUCED_TYPENAME * removed usage of BOOST_NO_CXX11_HDR_INITIALIZER_LIST * removed usage of BOOST_NO_MEMBER_TEMPLATES * removed usage of BOOST_NO_SFINAE * removed leftover pp line * removed usage of BOOST_NO_MEMBER_TEMPLATE_FRIENDS * removed usage of BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP * removed usage of BOOST_FUNCTION_SCOPE_USING_DECLARATION_BREAKS_ADL * removed usage of BOOST_NO_CXX11_HDR_TYPE_TRAITS * removed usage of BOOST_NO_CXX11_HDR_RANDOM * removed usage of BOOST_NO_POINTER_TO_MEMBER_TEMPLATE_PARAMETERS * removed usage of BOOST_NO_CXX11_DECLTYPE * removed workarounds for pre-C++11 compilers * updated dependencies * removed usage of BOOST_MULTI_INDEX_MEMBER and similar in examples * updated docs * added C++11 badge * updated as per Alexander Grund's review * editorial * removed unneeded #includes
116 lines
2.8 KiB
C++
116 lines
2.8 KiB
C++
/* Boost.MultiIndex basic example.
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*
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* Copyright 2003-2025 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/multi_index for library home page.
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*/
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#if !defined(NDEBUG)
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#define BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING
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#define BOOST_MULTI_INDEX_ENABLE_SAFE_MODE
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#endif
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#include <boost/multi_index_container.hpp>
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#include <boost/multi_index/member.hpp>
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#include <boost/multi_index/ordered_index.hpp>
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#include <algorithm>
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#include <iostream>
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#include <iterator>
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#include <string>
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using boost::multi_index_container;
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using namespace boost::multi_index;
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/* an employee record holds its ID, name and age */
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struct employee
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{
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int id;
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std::string name;
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int age;
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employee(int id_,std::string name_,int age_):id(id_),name(name_),age(age_){}
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friend std::ostream& operator<<(std::ostream& os,const employee& e)
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{
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os<<e.id<<" "<<e.name<<" "<<e.age<<std::endl;
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return os;
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}
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};
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/* tags for accessing the corresponding indices of employee_set */
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struct id{};
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struct name{};
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struct age{};
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/* Define a multi_index_container of employees with following indices:
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* - a unique index sorted by employee::id,
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* - a non-unique index sorted by employee::name,
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* - a non-unique index sorted by employee::age.
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*/
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typedef multi_index_container<
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employee,
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indexed_by<
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ordered_unique<
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tag<id>, member<employee,int,&employee::id> >,
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ordered_non_unique<
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tag<name>,member<employee,std::string,&employee::name> >,
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ordered_non_unique<
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tag<age>, member<employee,int,&employee::age> > >
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> employee_set;
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template<typename Tag,typename MultiIndexContainer>
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void print_out_by(const MultiIndexContainer& s)
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{
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/* obtain a reference to the index tagged by Tag */
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const typename boost::multi_index::index<MultiIndexContainer,Tag>::type& i=
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get<Tag>(s);
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typedef typename MultiIndexContainer::value_type value_type;
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/* dump the elements of the index to cout */
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std::copy(i.begin(),i.end(),std::ostream_iterator<value_type>(std::cout));
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}
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int main()
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{
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employee_set es;
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es.insert(employee(0,"Joe",31));
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es.insert(employee(1,"Robert",27));
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es.insert(employee(2,"John",40));
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/* next insertion will fail, as there is an employee with
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* the same ID
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*/
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es.insert(employee(2,"Aristotle",2387));
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es.insert(employee(3,"Albert",20));
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es.insert(employee(4,"John",57));
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/* list the employees sorted by ID, name and age */
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std::cout<<"by ID"<<std::endl;
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print_out_by<id>(es);
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std::cout<<std::endl;
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std::cout<<"by name"<<std::endl;
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print_out_by<name>(es);
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std::cout<<std::endl;
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std::cout<<"by age"<<std::endl;
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print_out_by<age>(es);
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std::cout<<std::endl;
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return 0;
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}
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