请问HN：你最喜欢的冷门但出色的C/C++库有哪些？
最近我一直在探索 C 和 C++ 的库，发现有很多鲜为人知的宝藏库，很少有人提及。<p>你最喜欢的那些不太知名的库有哪些——你认为更多人应该了解的？它们可以是小巧的单头文件工具、特定领域的工具，或者是你在发现时让你感到“哇”的东西。
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I’ve been exploring C and C++ libraries lately and realized there are so many hidden gems out there that rarely get mentioned.<p>What are your favorite lesser-known libraries — ones that you think more people should know about?
They could be tiny, single-header utilities, niche domain tools, or just something that made you go “wow” when you found it.