It's not google, it's C++ convention. http://stackoverflow.com/questions/301586/what-is-the-difference-between-using-includefilename-and-includefilename-h http

It's not google, it's C++ convention. http://stackoverflow.com/questions/301586/what-is-the-difference-between-using-includefilename-and-includefilename-h http://stackoverflow.com/questions/301586/what-is-the-differ... Btw, many editors understand // -- C++ -- Nevertheless Google's c++ style guide (https://code.google.com/p/google-styleguide/source/browse/trunk/cppguide.xml https://code.google.com/p/google-styleguide/source/browse/tr...) in fact says that headers should have the .h suffix.