[Cbc] How to obtain all solutions from the solver

[Vasily Stepanov]

I'm using callCbc() function, and I would like to obtain every new solution
during the solving process.
Here are some minimal example

    OsiClpSolverInterface osi;
    CbcModel model(osi);
    CoinModel build;
    // ... setting up the model.
    osi.loadFromCoinModel(build);
    MyEventHandler eventHandler;
    model.passInEventHandler(&eventHandler);
    callCbc(args, model);

And later the event method:

    CbcEventHandler::CbcAction MyEventHandler::event(CbcEvent whichEvent) {
        const CbcModel *model = getModel();

        // Here I can filter out sub trees.
        if (model->parentModel()) {
            return CbcEventHandler::CbcAction::noAction;
        }

        if (whichEvent == CbcEventHandler::CbcEvent::solution || whichEvent
== CbcEventHandler::CbcEvent::heuristicSolution) {
            const double *best_solution = model->bestSolution();

            // And here is the best solution found so far.
            // But still this is not the solution for my problem, but for
the optimised one,
            // with reduced number of columns.
            std::vector<double> original_solution(original_columns_count,
0);
            const int* original_columns = model->originalColumns();
            for (int i = 0; i < model->getNumCols(); ++i) {
                original_solution[original_columns[i]] = best_solution[i];
            }

            // original_solution will have zeroes where it should not be.
        }
    }

The question is: How to restore the solution from the one which has reduced
number of columns.
And more general question: How to obtain every new solution during the
solving process in callCbc() method.


Thanks,
// Vasily
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