Originally posted by: prasr29

Hello,

             Greetings. I am using concert technology in C++ and I am facing an issue with respect to the callback which I have written. Actually the problem is to as soon as an incumbent node has a integer value less than a particular value, the program should stop execution.  The code I have written is as follows: 

ILOMIPINFOCALLBACK3(abortingCallback,
                    IloCplex, cplex,
                    IloBool, aborted,
                    double, sol_cut1)
{
     if ( !aborted  &&  hasIncumbent()) {
         cout<<"sol_cut"<<sol_cut1<<endl;
        if(sol_cut1 > getIncumbentObjValue()){
            //printf ("Obj at Incumbent\n", cplex.getObjValue);
         aborted = IloTrue;
         abort();
      }
   }
}

The value sol_cut is passed from the main program.

Cplex is giving results as follows:

After the callback is encountered it stops but in this stage I want the execution to stop but it solves still optimality. Is it something wrong that I am doing here ? Thanks for your help.

The log looks as if you call IloCplex::solve() a second time? Is that possible?

We can see the line

sol_cut ...

printed. This comes from your callback that is supposed to abort the run. A few lines later we see CPLEX report timings:

Root node processing (before b&c): ...
...
Total (root+branch&cut) = ...

This is usually printed right before solve() returns. Next we see the line

MIP emphasis ...

which usually indicates a new call to solve().

Originally posted by: prasr29

Thanks for your answer Daniel. Indeed that's the problem. There is another solve command, after the callback. Corrected it now and its all good. Thank you :)