Re: [Boost-users] [multi_index] Problem with find() and Hashed_Index

From: JOAQUIN LOPEZ MU?Z (joaquin_at_[hidden])
Date: 2005-12-03 18:31:08

Hello Martin,

----- Mensaje original -----
De: Martin Higham <martinh_at_[hidden]>
Fecha: Sábado, Diciembre 3, 2005 11:42 am
Asunto: [Boost-users] [multi_index] Problem with find() and 
Hashed_Index

> I have created a multi_index_container inline with one ordered_unique
> index and one  hashed_unique index as demonstrated in the
> documentation 
> 
(http://www.boost.org/libs/multi_index/doc/advanced_topics.html#hash_lo
okup).I can happily add and retrieve items using find() as indicated.
> 
> However, if I use the =* operator as indicated and there is no
> matching record a memory error occurs.
> 
> Therefore I need to assign the find result to an iterator and check
> for end(). Can anyone tell me what type this iterator should be? I've
> tried many combinations non of which compile.

There are several syntaxes to get to the type
of the iterator:

your_container_type::nth_index<N>::type::iterator
your_container_type::index<Tag>::type::iterator
your_container_type::nth_index_iterator<N>::type
your_container_type::index_iterator<Tag>::type

Where N is the 0-based ordinal of the index you're
interested in. If the index is tagged, you can also
use the <Tag> variations.
Does this help? Thanks for using Boost.MultiIndex!

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo