"Include what you use" means this: for every symbol (type, function, variable, or macro) that you use in foo.cc (or foo.cpp), either foo.cc or foo.h should include a .h file that exports the ...

Cpplint is a command-line tool to check C/C++ files for style issues according to Google's C++ style guide. Cpplint used to be developed and maintained by Google Inc. at google/styleguide. Nowadays, ...