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C library for creating and accessing dynamic arrays

Judy is a C library that implements a dynamic array. Empty Judy arrays are declared with null pointers. A Judy array consumes memory only when populated yet can grow to take advantage of all available memory. Judy's key benefits are: scalability, performance, memory efficiency, and ease of use. Judy arrays are designed to grow without tuning into the peta-element range, scaling near O(log-base-256).

Judy arrays are accessed with insert, retrieve, and delete calls for number or string indexes. Configuration and tuning are not required -- in fact not possible. Judy offers sorting, counting, and neighbor/empty searching. Indexes can be sequential, clustered, periodic, or random -- it doesn't matter to the algorithm. Judy arrays can be arranged hierarchically to handle any bit patterns -- large indexes, sets of keys, etc.

Judy is often an improvement over common data structures such as: arrays, sparse arrays, hash tables, B-trees, binary trees, linear lists, skiplists, other sort and search algorithms, and counting functions.

Package version:1.0.5-1


judy (1.0.5-1) unstable; urgency=low

  * Fixed alignment issue, (Closes: #401124)
  * Update packaging, policy, debhelper, etc.
  * Removed old BIT cruft from rules
  * Upstream has propper distclean target (Closes: #424425)

 -- Troy Heber <>  Mon, 21 May 2007 15:07:50 -0600

judy (1.0.3-2) unstable; urgency=low

  * Resolves #372525, remove .shlibs
  * Policy update
  * Updated 


1.0.5  Version (May 2007) by (twh)
o added proper clean targets to enable multiple builds
o added examples directory
o Correctly Detects 32/64-bit build environment
o Allow explicit configure for 32/64-bit environment

1.0.4  Version (May 2007) by (twh)
o fixed the Checkit problem "error Judy1PrevEmpty Rcode != 1 = 0"
o Fixed memory allignment in JudyMallocIF.c (doug)
o Fixed messages from "make c


Judy was originally packaged by Theodore Ts'o <>, the package is
maintained by Troy Heber <>. 

It was downloaded from

Upstream Author: Hewlett-Packard Company

Copyright(c) 2002, 2005 Hewlett-Packard Development Company, L.P.
             2005 Doug Baskins

   The GNU C Library is free software; you can redistribute it and/or

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