> masar...@aero.polimi.it wrote: >> I need to implement a modify operation whose semantics is "add if not >> present", an add that only takes place if that attribute is not yet >> present in the entry. >> >> I need it as an internal operation, so right now I wouldn't bother >> formalizing it as an extension of the semantics of the modify operation. >> Something like the SLAP_MOD_SOFTADD, which in turn consists in adding an >> attribute value only if that value is not already present. >> >> I'd introduce a SLAP_MOD_ADD_IF_NOT_PRESENT flag and add code to support >> it in all (well, most) backends/overlays that need to muck with modify >> operation type. > > Sounds like you could do it with an Assertion Control (!(attr=*)).
Well, I already considered the possibility to combine already existing semantics; however, there are two good reasons not to use that: 1) if the assertion fails, the operation needs to be resubmitted 2) there might already be an assertion control on the request p.
