From 951f316470acc7c785c460a4e40735b22822349f Mon Sep 17 00:00:00 2001 From: Jason Evans Date: Mon, 9 Aug 2010 17:17:34 -0500 Subject: Add treap implementation Provide macros to generate a type-specific treap implementation and various functions to operate on it. It uses obj_pool.h to store memory nodes in a treap. Previously committed nodes are never removed from the pool; after any *_commit operation, it is assumed (correctly, in the case of svn-fast-export) that someone else must care about them. Treaps provide a memory-efficient binary search tree structure. Insertion/deletion/search are about as about as fast in the average case as red-black trees and the chances of worst-case behavior are vanishingly small, thanks to (pseudo-)randomness. The bad worst-case behavior is a small price to pay, given that treaps are much simpler to implement. >From http://www.canonware.com/download/trp/trp_hash/trp.h [db: Altered to reference nodes by offset from a common base pointer] [db: Bob Jenkins' hashing implementation dropped for Knuth's] [db: Methods unnecessary for search and insert dropped] [rr: Squelched compiler warnings] [db: Added support for immutable treap nodes] [jn: Reintroduced treap_nsearch(); with tests] Signed-off-by: David Barr Signed-off-by: Ramkumar Ramachandra Signed-off-by: Jonathan Nieder Signed-off-by: Junio C Hamano --- .gitignore | 1 + 1 file changed, 1 insertion(+) (limited to '.gitignore') diff --git a/.gitignore b/.gitignore index 1e64a6a138..af47653fed 100644 --- a/.gitignore +++ b/.gitignore @@ -173,6 +173,7 @@ /test-run-command /test-sha1 /test-sigchain +/test-treap /common-cmds.h *.tar.gz *.dsc -- cgit v1.2.3