Modern text editors and IDEs have plenty of features to better find your way around in large source files. One objective advantage of putting the entire impleme

Modern text editors and IDEs have plenty of features to better find your way around in large source files. One objective advantage of putting the entire implementation code of a C or C++ library into one source file is that you can entirely get rid of private interface headers (also, as other have said, 2kloc in one file isn't really all that much).