What if the composite key should be parameterized from a file? In the case of <raw> struct phonebook_entry{ std::string family_name; std::string given_name; std::string phone_number; phonebook_entry( std::string family_name, std::string given_name, std::string phone_number): family_name(family_name),given_name(given_name),phone_number(phone_number) {}}; // define a multi_index_container with a composite key on // (family_name,given_name)typedef multi_index_container< phonebook_entry, indexed_by< //non-unique as some subscribers might have more than one number ordered_non_unique< composite_key< phonebook_entry, member<phonebook_entry,std::string,&phonebook_entry::family_name>, member<phonebook_entry,std::string,&phonebook_entry::given_name> > >, ordered_unique< // unique as numbers belong to only one subscriber member<phonebook_entry,std::string,&phonebook_entry::phone_number> >
phonebook;
</raw> the lines member<phonebook_entry,std::string,&phonebook_entry::family_name>, member<phonebook_entry,std::string,&phonebook_entry::given_name> should be auto-generated by reading a composite key from a file. 2014-02-04 Jason [via Boost] <ml-node+s2283326n4658955h57@n4.nabble.com>:
On 02/04/2014 03:36 PM, syvyi wrote:
Hello,
there's a structure struct person { std::string name; std::string surname; int birth_year; std::string craft; };
How to create such a multiindex container that dumping could performed using an index as name, surname and year triple alltogether? Sounds like you might be interested in MultiIndex's composite key feature:
http://www.boost.org/doc/libs/1_55_0/libs/multi_index/doc/tutorial/key_extra...
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