Ask Slashdot: Is there a C/C++ Code Repository?

Jason Lewis asks a good one: "Is there a Linux C/C++ code repository? For example, I was looking for code that accesses the serial port. Another example would be that tedious error-checking crap that I feel guilty about because I don't check and handle every possible errno value. I found plenty on the net and hacked out my project, but it strikes me that a central location for working, well-commented, and GPL'ed code would be infinitely useful. My question is: "Does such a beast exist, and If Not, Why Not?"

I would suspect that there is no such beast, I know of a few attempts, but they either have dissapeared or have very sparse information. Codebits was one such attempt, but the examples there are very basic and probably only useful for the novice Perl programmer (their C/C++ section has only one entry)

Anyone have any others? How about repositories for operating systems other than Linux?