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Author:halw

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Date:2009-07-17T16:34:56.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@253 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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halw
2009-07-17 16:34:56 +00:00
parent 50c22b979e
commit 4baa88292c
2 changed files with 7 additions and 7 deletions
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documentation/current/solutions/basic-computing/eiffelbase/eiffelbase-tutorial/eiffelbase-kernel.wiki
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@@ -379,7 +379,7 @@ Sometime you will be in a position where the schema of a class will have changed
The storable mechanism allows you to retrieve the old version of the object only if it was saved using the <eiffel>independent_store</eiffel> facility. Each time you retrieve an object of a certain base class whose schema has changed, the feature <eiffel>correct_mismatch</eiffel> will be called. This feature is defined in [[ref:/libraries/base/reference/any_chart|ANY]] and by default will raise an exception. To handle the mismatch, you need to redefine <eiffel>correct_mismatch</eiffel> in the base class whose schema has been changed. For example in EiffelBase, [[ref:/libraries/base/reference/hash_table_chart|HASH_TABLE]] has changed between version 5.1 and version 5.2 to use <eiffel> SPECIAL</eiffel> rather than [[ref:/libraries/base/reference/array_chart|ARRAY]] for its internal data storage. To retrieve a 5.1 version of [[ref:/libraries/base/reference/hash_table_chart|HASH_TABLE]], you need to define <eiffel>correct_mismatch</eiffel> as following:
<code>
correct_mismatch is
correct_mismatch
-- Attempt to correct object mismatch during retrieve using `mismatch_information'.
local
array_content: ARRAY [G]