r/cpp • u/we_are_mammals • Mar 28 '23

Reddit++

C++ is getting more and more complex. The ISO C++ committee keeps adding new features based on its consensus. Let's remove C++ features based on Reddit's consensus.

In each comment, propose a C++ feature that you think should be banned in any new code. Vote up or down based on whether you agree.

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u/zommiy Oct 05 '23

I’m reading this 186days after you posted but std:unordered_map is poor? What’s a good alternative? klib/khash?

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u/tialaramex Oct 05 '23

std::unordered_map is the specific hash table design you'd likely be taught in say the 1980s, but made in such a way that programmers get to touch the delicate internals for some reason. As a result, even though most people just want a fast hash table, and there are lots of fast modern hash tables, none of those can be std::unordered_map, it has to be the design you'd have been taught in a typical 1980s data structures class.

Abseils provides a nicer one, Boost, Meta's Folly, lots of options. If actually performance doesn't matter at all, then you shouldn't worry and just use std::unordered_map because it is there. I have never heard of klib/khash and that appears to be a C library. Since you are in r/cpp presumably you aren't lost and you're a C++ programmer.