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@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.ht... 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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