This is automated checker to make sure a C++ file follows Google's C++ style guide (http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml). As it heavily relies on regular expressions, cpplint.py won't catch all violations of the style guide and will very occasionally report a false positive. There is a list of things we currently don't handle very well at the top of cpplint.py, and we welcome patches to improve it. The linting tool takes a list of files as input. For full usage instructions, please see the output of: ./cpplint.py --help Unit tests are provided in cpplint_unittest.py. This file can safely be ignored by end users who have downloaded this package and only want to run the lint tool. WWW: http://code.google.com/p/google-styleguide/