[odb-users] Sharing common object between multiple ODB schemas

[Boris Kolpackov]

Per Edin <per.edin at sequence-point.se> writes:

> odb ... --at-once --schema-name core core/core.hxx
> odb ... --at-once --schema-name extras extras/extras.hxx
> 
> core/core.hxx and extras/extras.hxx includes all headers belonging to
> the respective schemas.
> 
> As can be seen the uuid class is shared between the two schemas. Can
> you recommend a way to handle this? Currently, the database code for
> class my_app::uuid ends up in both core-odb._xx and profile-odb._xx
> resulting in duplicate symbols.

The only way is not to use the --at-once mode for the C++ code
generation. This way you would compile uuid.hxx separately with
core and extras' *-odb files including uuid-odb.hxx.


> I guess I could just copy uuid.hxx to both core/ and extras/ but that
> doesn't feel right.

That's the only way to make it work in the --at-once mode (you could
avoid physical copy by including the header inside a namespace).