Common libraries and data structures for C

Common libraries and data structures for C(github.com)

24 points by janselman 5 years ago | 6 comments

d26900 5 years ago |

That's a cool library! Well done!

I made something similar to it being inspired by the C++ standard library. But it is for C89:

https://github.com/d26900/JamaisVu

I use tombstones for my hash table (unordered_map) though.

Another drawback of my lib: for each hash table entry, I allocate an extra byte for the tombstones.

Delk 5 years ago | |

I've been making something kind of similar as well, although it's neither that pretty nor as minimal as I may have aimed for. And unlike the library in the post title, I only did container-style data structures, not other common stuff.

https://github.com/mwahlroos/libcoll-c

janselman 5 years ago | |

Btw I'm not the author, author posted on reddit : https://www.reddit.com/r/C_Programming/comments/lh9irz/commo...

I don't know much about hashmaps but the disadvantage with tombstones is if you add/remove a lot, then you have to rehash your map at some point right?

I really like tiny libs anyway, yours looks good, very readable :)

d26900 5 years ago | | |

I am not an expert either, but I would say that you have to rehash it either way if it grows (or shrinks). Tombstones as I understand it, are a way to "mark" deleted entries off of the hash table. Having these deleted entries marked ensures that your hash table doesn't break its "search chain". This is important so that you still can find entries that are put at another index when one index ("bucket") is already occupied.

However, I also don't shrink my table, once it grows. It stays grown. (Another drawback of my lib I suppose).

Thank you for the feedback, I really appreciate it! :)

rurban 5 years ago |

Similar to mine https://github.com/rurban/ctl

But mine are very close to the STL with generic iterators/ranges and algorithms over containers.