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it should be:

    Mat traindata = tdata->getTrainResponses();

(without the TrainData::)

it should be:

    Mat traindata = tdata->getTrainResponses();

(without the TrainData::) . your code produces a different signature, while linking)

it should be:

    Mat traindata = tdata->getTrainResponses();

(without the TrainData:: . your code produces a different signature, while linking)

it should be:

    Mat traindata = tdata->getTrainResponses();

(without the TrainData:: . your code produces a different signature, while linking))

(( tdata->TrainData::getTrainResponses(); is still "pure virtual" ))