[odb-users] Re: Handling pimpl idiom in ODB

Boris Kolpackov boris at codesynthesis.com
Sun Aug 28 08:29:10 EDT 2011

Hi Uwe,

The support for composite value (and container) wrappers is in the
master. I also create an example that shows how to use this feature
to handle the C++ pimpl idiom:


While at it, I discovered yet another limitation of this approach:
if you are using queries, you will have to specify the 'impl' value
type name before the data members, e.g., query::impl::age < 30 
instead of query::age < 30. This is quite ugly if you are using
queries and is the reason (along with other limitations I listed in
my previous email) why the above example is no in the odb-examples
package. I think the "recommended" way to handle the pimpl idiom in
ODB will be the "virtual data members" approach. However, other than
the mentioned limitations, the value type approach works fine.

I am planning to create another alpha release for 1.6.0 some time
soon, so you should have something packaged and ready to try by the
time you are back.


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