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libs/multi_index/example/basic.cpp

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+/* 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;
+}