# LGenerics

From Free Pascal wiki

# About

Collection of generic algorithms and data structures entirely written in/for FPC and Lazarus. Started as a self-education project, it now seems quite comfortable and fast.

Requires: FPC 3.2+, Lazarus 1.9+.

Author: A.Koverdyaev (avk)

License: Apache License 2.0

# Features

Implemented primitives:

- stack (unit LGStack)
- queue (unit LGQueue)
- deque (unit LGDeque)
- vector (unit LGVector)
- vector of bits (unit LGVector)
- priority queue based on binary heap (unit LGPriorityQueue)
- priority queue with key update and melding based on pairing heap (unit LGPriorityQueue)
- sorted list (unit LGList)
- hashed list - array based list with the ability to fast search by key (unit LGList)
- hashset (unit LGHashSet)
- fine-grained concurrent hashset (unit LGHashSet)
- sorted set (unit LGTreeSet)
- set of arbitrary size (unit LGUtil, TGSet)
- hash multiset (unit LGHashMultiSet)
- fine-grained concurrent hashmultiset (unit LGHashMultiSet)
- sorted multiset (unit LGTreeMultiSet)
- hashmap (unit LGHashMap)
- fine-grained concurrent hashmap (unit LGHashMap)
- sorted map (unit LGTreeMap)
- hash multimap (unit LGMultiMap)
- tree multimap (unit LGMultiMap)
- list miltimap (unit LGMultiMap)
- bijective map (unit LGBiMap)
- sparse 2D table (unit LGTable2D)
- disjoint set (unit LGHashSet)
- AVL tree (unit LGAvlTree)
- red-black tree (unit LGRbTree)
- some treap variants (unit LGTreap)
- general rooted tree (unit LGRootTree)
- sparse labeled undirected graph (unit LGSimpleGraph)
- sparse labeled directed graph (unit LGSimpleDigraph)

Algorithms on arrays and vectors (mostly unit LGArrayHelpers):

- reverse, right/left cyclic shifts
- permutations
- binary search
- N-th order statistics
- inversion counting
- distinct values selection
- quicksort
- introsort
- dual pivot quicksort
- mergesort
- timsort (unit LGMiscUtils)
- counting sort
- translation of Orson Peters' PDQSort algorithm
- static segment tree
- ...

Other:

- non-cryptogarphic hashes (unit LGHash):
- Yann Collet's xxHash32, xxHash64
- Austin Appleby's MurmurHash2, MurmurHash2A, MurmurHash3_x86_32, MurmurHash64A

- brief and dirty implementation of futures concept (unit LGAsync)
- brief channel implementation (unit LGAsync)
- brief implementation of thread pool (unit LGAsync)
- 128-bit integers (unit LGInt128)