Where to find implementation of BFMatcher::match

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I want to study the implementation of BFMatcher to make some modifications.

I have found this file: https://github.com/opencv/opencv/blob..., which contains implementation of ocl_match in BFMatcher, but I am not able to find any implementation for ordinary match. Where can I find the code that executes when BFMatcher.match(...) is called if HAVE_OPENCL is not true?

Thanks!