Re: [Boost-users] Boost.MultiIndex. Using several keys together.

Subject: Re: [Boost-users] Boost.MultiIndex. Using several keys together.
From: syvyi (alexander.svk_at_[hidden])
Date: 2014-02-04 16:35:04

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_at_[hidden]>:

>
> 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_extraction.html#composite_keys
>
> Jason
> _______________________________________________
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