From: Victor Porton <porton@narod.ru>
Subject: "NULL" returned by a function
Date: Sat, 09 Aug 2014 00:10:28 +0300
Date: 2014-08-09T00:10:28+03:00 [thread overview]
Message-ID: <ls3ec1$v3q$1@speranza.aioe.org> (raw)
What if I want to make a function which returns either a value of type T or
a value signifying "nothing" (like null pointer)?
To make things worse, T is a controlled type, so if we return just "access
T" the finalization of the object of type T may be easily overlooked.
What is the best way to implement this? variant record? whatever?
Or maybe should I modify the type T to allow it contain "null" state? (In
fact the particular T which I use can be easily modified to allow storing
there null and checking whether it's state is null. But I think on the way
not to be dependent on the ability to change the definition of T.)
--
Victor Porton - http://portonvictor.org
next reply other threads:[~2014-08-08 21:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-08 21:10 Victor Porton [this message]
2014-08-08 21:19 ` "NULL" returned by a function Jeffrey Carter
2014-08-08 22:04 ` Victor Porton
2014-08-08 22:50 ` Jeffrey Carter
2014-08-09 12:45 ` Victor Porton
2014-08-09 15:13 ` Jeffrey Carter
2014-08-08 21:25 ` Shark8
2014-08-09 16:15 ` Maciej Sobczak
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