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The C and C++ languages use header files for defining an API. When reviewing changes, it is much more friendly to take a look at the API contracts first, and only then show the actual implementation. Unfortunately, the default alphabetical order sorts .cpp before .h, which means that users who use the [ and ] keys for file navigation are first shown the implementation, and only then the "big picture" API changes. The conventions for file extensions vary; it's common to have .h/.hpp/.hxx and .c/.cpp/.cxx in any combination. For example, most of the Qt and KDE (sub)projects use .h and .cpp. Things are a bit more complicated by use of the PIMPL idiom in these projects where it's desirable to have Foo.h (public header), Foo_p.h (private implementation header) and Foo.cpp (implementation) to be shown in this order. That's out of scope for now, though. Change-Id: Id3bab23f4458320764a0dcd88c32c1a1d1b06075 Inspired-By: Martin Gräßlin <mgraesslin@kde.org>