I am extremely sorry, i missed your mail. First of all thanks a lot for replying.

I have fixed the issue for now. But i am actually explaining the issue i had. Please take a shot at it.

Say i have an object and i have created multi index on some members of the object. Now since,

this is being used in a multi-threaded code, i will acquire a mutex on the whole multi-index, only if i have

updated those attributes involved in the multi-index build. Else i won't take the mutex.

Now my problem is, i have multi-indexed many such classes. what is the best way to check whether

the updated attribute is part of multi-index. Currently we have written a python code which scans the C++

files and creates a list of attribute numbers ( each member attribute has a number associated with it ).

Whenever there is an update, we check against the list produced by the python code in C++.

My question was if there is a way to do this within C++ itself.

Please let me know, whether i ma not clear on explaining my question.

On Tue, Jan 4, 2011 at 6:23 AM, Joaquin M Lopez Munoz <joaquin@tid.es> wrote:

Gokulakannan Somasundaram <gokul007 <at> gmail.com> writes:

>
>
> Hi,
> Say i have a boost::tuple / MPL Sequence, on which i have
> created a multi-index. Is it possible for me collect all the
> attribute numbers on which i have declared the
> IndexSpecifierList( the one passed as template parameter to
> boost::multi_index::indexed_by ) ?

Hi Gokul,

I'm not sure I undersand your question. Have you taken a
look at the index_type_list nested type?

http://www.boost.org/libs/multi_index/doc/reference/multi_index_container.html#
types

>From this MPL sequence you can easily extract the list
of key extractor types used for defining the
multi_index_container, which hopefully is close to what
you're after.

Don't hesitate to elaborate a little more on your question
and I'll see whether I can be more helpful.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

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