Re: [Boost-users] Collecting boost multi-index meta data

Subject: Re: [Boost-users] Collecting boost multi-index meta data
From: Gokulakannan Somasundaram (gokul007_at_[hidden])
Date: 2011-03-22 11:32:57

Hi Joaquín ,
         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.

Thanks,
Gokul.

On Tue, Jan 4, 2011 at 6:23 AM, Joaquin M Lopez Munoz <joaquin_at_[hidden]>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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