I'm trying to use multi_index to store objects pointers. These objects
have mainly 3 fields :
- string name
- int id
- int block_id
name & id are unique among all instances, but block_id can be the same
for many instances. I want to distribute the object instances among a
few blocks, so many instances can have block_id 0, many others block_id
1, and so on. (there are 6 blocks for the moment)
here is my struct :
/* tags */
struct name_{} ;
struct id_{} ;
struct block_id_{} ;
typedef hashed_unique<
tag,
boost::multi_index::mem_fun
> NameIndex ;
typedef ordered_unique<
tag,
boost::multi_index::mem_fun
> IdIndex ;
typedef ordered_non_unique<
tag,
boost::multi_index::mem_fun
> BlockIndex ;
typedef multi_index_container > FooList ;
The name & id indexes work well but I dont manage to get the Foo*
pointers for a given block_id. I m using :
foo_list_.get().find(1) to grab the wanted list. My problem
is that in the result I have not only Foo instances from the block 1.
This is what I get when I try to query for a given block_id :
For block 5 : only objects with block_id == 5
For block 4 : objects with block_id == 4 and 5
For block 3 : objects with block_id == 3, 4 and 5
For block 2 : objects with block_id == 2, 3, 4 and 5
and so on.
I d like to get only the objects with block_id = 4 when I query the
multi_index object on its block_id index.
I now wonder if what I want to do can be done with multi_index.
Thanks in advance for your help
