C++ Twitter: you need a hash map for a performance-critical part of your code. What do you reach for first? Abseil?
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https://github.com/YosysHQ/yosys/blob/master/kernel/hashlib.h …
Not perfect but it's a single file, perfoms reasonably well, and is mine. ;) Biggest cons are probably std:: vector resizing when inserting a lot, and that it still contains my deadname copyright. 
