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