[Boost-users] multi_index_container for composite key

Subject: [Boost-users] multi_index_container for composite key
From: Uthpal Urubail (uthpal.urubail_at_[hidden])
Date: 2010-09-08 22:38:09

Hi 

I am looking for a composite key container. 

Though I found multi_index_container for composite key is the best I
have few doubts in its use case:

Question:01

class Book

{

public:

    size_t mID;

    size_t node[3];

};

How to add the below into multi_index_container?

 

typedef multi_index_container<

    Book, 

    indexed_by<

    ordered_unique<

        composite_key<

            Book,

            member<Book,size_t,&Book::node[0]>,

            member<Book,size_t,&Book::node[1]>,

            member<Book,size_t,&Book::node[2]>

            >

    >,

    ordered_unique<

    member<Book,size_t,&Book::mID>

    >

    >

> beambook;

 

Question:02

My requirement is straight forward. I need to get the id by providing 3
nodes.

Should I always need to create a data structure? [class Book] 

Can't I have something like below?

typedef multi_index_container<

    size_t, 

    indexed_by<

    ordered_unique<

        composite_key<

            size_t, size_t, size_t

            >

    >,

    ordered_unique<

    size_t

    >

    >

> beambook;

 

Thanks,

UJ