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Usage of CV_CALL

This question is for the OpenCV source code contributors out there.

Is it necessary to write all OpenCV function calls inside source code of OpenCV using CV_CALL(< function name >). For example, a simple assignment statement was written as

        CV_CALL(sum[cls]              = cvCreateMat( 1, var_count, CV_64FC1 ));

Usage of CV_CALLCV_CALL when contributing source code

This question is for the OpenCV source code contributors out there.

Is it necessary to write all OpenCV function calls inside source code of OpenCV using CV_CALL(< function name >). For example, a simple assignment statement was written as

        CV_CALL(sum[cls]              = cvCreateMat( 1, var_count, CV_64FC1 ));