ALT X. People will just copy-paste your example code. This is obvious but is something to keep in mind. Example code should never be sketches. It should be production ready. People will not read the comments. I had lots of spots in example code where I would write comments like "this is just a sketch and not ready for production; production code needs to check error returns and handle failures and be endian-independent" etc.. and of course people just copy-pasted it and didn't change it. That's not their fault, that's my fault. Example code is one of the main ways people get into your library. X. People will not read the docs. Docs are almost useless. Nobody reads them. They'll read a one page quick start, and then they want to just start digging in writing code. Keep the intros very minimal and very focused on getting things working. Also be aware that if you feel you need to write a lot of docs about something, that's a sign that maybe things are too complicated. X. Peripheral h...

ALT X. Simplicity is better. Make everything as simple as possible. Fewer arguments on your functions. Remove extra functions. Cut everywhere. If you sacrifice a tiny bit of possible efficiency, or lose some rare functionality, that's fine. Cut cut cut. For example, to plug in an allocator for Oodle used to require 7 function pointers : { Malloc, Free, MallocAligned, FreeSized, MallocPage, FreePage, PageSize }. (FreeSized for efficiency, and the Page stuff because async IO needs page alignment). It's now down just 2 : { MallocAligned, Free }. Yes it's a tiny bit slower but who cares. (and the runtime can work without any provided allocators) X. Micro-efficiency is not important. Yes, being fast and lean is good, but not when it makes things too complex or difficult to use. There's a danger of a kind of mental-masturbation that us RAD-type guys can get caught in. Yes, your big stream processing stuff needs to be competitive (eg. Oodle's LZ decompress, or Bink's frame decode time). B...

ALT X. Special case stuff should be external (and callbacks are bad). Anything that's unique to a few users, or that people will want to be different should be out of the library. Make it possible to do that stuff through client-side code. As much as possible, avoid callbacks to make this work, try to do it through imperative sequential code. eg. if they want to do some incremental post-processing of data in place, it should be possible via : { decode a bit, process some, decode a bit , process some } on the client side. Don't do it with a callback that does decode_it_all( process_per_bit_callback ). Don't crud up the library feature set trying to please everyone. Some of these things can go in example code, or in your "back pocket code" that you send out as needed. X. You are writing the library for evaluators and new users. When you're designing the library, the main person to think about is evaluators and new users. Things need to be easy and clear and just work for them. Peop...