[SCIP] Help with Constraint Handler

[Enrico Calandrini]

Hi everyone,

first of all thanks a lot for your works!

Now, I write to you because I'm trying to create a new constraint handler in my project. I have read the online documentation about this argument and implemented all the fundamentals callback. Even if the handler is not quite finished, I wanted to check the formal correctness of my work so far trying to include it in the project. However, when I try to compute the code, I get the following error:

/home/something.cpp:342:71: error: invalid new-expression of abstract class type ‘dummy_Conhdlr’
  342 |    auto conhdlr = new dummy_Conhdlr( scip , this , CutSepPar );
      |
In file included from /home/something.cpp:36:
/home/something.h:52:7: note:   because the following virtual functions are pure within ‘dummy_Conhdlr’:
   52 | class dummy_Conhdlr : public scip::ObjConshdlr
      |       ^~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/scip/scip.h:63,
                 from /home/something.h:39,
                 from /home/something.cpp:34:
/usr/local/include/objscip/objconshdlr.h:268:12: note:     ‘virtual SCIP_RETCODE scip::ObjConshdlr::scip_trans(SCIP*, SCIP_CONSHDLR*, SCIP_CONS*, SCIP_CONS**)’
  268 |    virtual SCIP_DECL_CONSTRANS(scip_trans) = 0;

If I understand correctly the error, it is saying that I need to implement the scip_trans function, but I don't understand why. I have some constraint data in my handler, but I don't want to change them during the execution, so according to the documentation I should not need to implement it.

Thank you very much in advance for your help!

Best regards,

Enrico
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