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PSPP-BUG: [bug #20910] GUI becomes extremely slow after executing syntax

From: John Darrington
Subject: PSPP-BUG: [bug #20910] GUI becomes extremely slow after executing syntax which doesn't read the data
Date: Mon, 10 Sep 2007 01:58:02 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20060607 Debian/1.7.12-1.2

Follow-up Comment #3, bug #20910 (project pspp):

The principle is quite elegant IMO and it seems to work too.

Some ideas which might make the implementation more elegant:

0. Make lazy_casereader a class derived from casereader ...

1. ... this means that used_reader and owns_reader can be methods    on
lazy_casereader which inspect and mutate the object respectively. 

2. lazy_casereader need not contain a PsppireDataStore * --- it would be
sufficient to contain a struct datasheet *, which would mean that lazy
casereader could live in src/data where is belongs.


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