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Matching features across three images?

I have three images. I have the storage:

    cv::Mat desc1;
    cv::Mat desc2;
    cv::Mat desc3;
    std::vector<cv::KeyPoint> keyPnts1;
    std::vector<cv::KeyPoint> keyPnts2;
    std::vector<cv::KeyPoint> keyPnts3;
    std::vector<cv::DMatch> match12;
    std::vector<cv::DMatch> match23;

I detect keypoints on all three, and fill the desc Mats. I match 1and 2, and fill match12

Now, i need to match the already matched features of image 2 with image 3, so that features are matched across all three images.

How can i do this? thanks!