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Garbage collection and mutable data structures

• To: mathgroup at smc.vnet.net
• Subject: [mg85638] Garbage collection and mutable data structures
• From: massyah at gmail.com
• Date: Sat, 16 Feb 2008 03:33:06 -0500 (EST)

Hi MathGroup,

This snippet of code is giving me headaches:

-----
$HistoryLength = 0;
NewCell[i_] := Module[{c}, CellVal[c] ^= i; c]
MemoryInUse[]
NewCell /@ Range[10^5];
MemoryInUse[]
-----

It occurred while trying to build mutable data structures by using
upvalues. I can't understand why the temporary variable c is not freed
since I don't keep any reference to it.
Have I missed something in the reference counting scheme ?


Thanks in advance,
Hayssam.

• Follow-Ups:
  • Re: Garbage collection and mutable data structures
    • From: Sseziwa Mukasa <mukasa@jeol.com>