From: "chris.danx" <spamoff.danx@ntlworld.com>
Subject: OO: How to? Writeable from a readable?
Date: Sun, 05 Jan 2003 23:09:12 +0000
Date: 2003-01-05T23:09:12+00:00 [thread overview]
Message-ID: <3T2S9.721$GU4.33144@newsfep1-gui.server.ntli.net> (raw)
Hi,
How can you resolve the following problem? Let's suppose you have a
tagged type readable_x say, which only allows you read access to the
data in it, and you want to extend it with a new tagged type writeable_x
which allows you read and write access to data. How can you do this?
The problem as I see it, is that if you make the data in readable_x
private you can't extend and modify it in the extended type, but if you
make it public anyone can modify the data anyway. Is there a way around
this problem (I want to allow a writeable wherever a readable is allowed!)?
Cheers,
Danx
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next reply other threads:[~2003-01-05 23:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-05 23:09 chris.danx [this message]
2003-01-05 23:40 ` OO: How to? Writeable from a readable? tmoran
2003-01-06 3:39 ` John R. Strohm
2003-01-06 9:25 ` chris.danx
2003-01-06 18:00 ` OO: " Stephen Leake
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