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Hi! You can read general information about parallel_for in TBB docs. So, you shold just put your top for loop in the operator() of Body class (as pointed by @Vladislav Vinogradov in answer on the same question). Something like this:

void operator ()( const cv::Range& rowRange ) const
{
    for ( int y = rowRange.start; y < rowRange.end; y++ )
    {
        // your loop body
    }
}
...
// calling parallel_for_
cv::parallel_for_(cv::Range(0, dst->height), body);