From: Victor Porton <porton@narod.ru>
Subject: Limited object by reference or access argument?
Date: Mon, 07 Aug 2017 00:16:34 +0300
Date: 2017-08-07T00:16:34+03:00 [thread overview]
Message-ID: <om80vg$1a68$1@gioia.aioe.org> (raw)
Suppose we have
type World_Type is tagged limited private;
type BNode_ID_Handler is abstract tagged limited private;
We need to set a bnode handler for a world object. Should the procedure
signature be
procedure Set_Handler (World: World_Type;
Handler: access BNode_ID_Handler'Class);
or
procedure Set_Handler (World: World_Type;
Handler: BNode_ID_Handler'Class);
The later can work with limited BNode_ID_Handler type, because tagged and
limited types are always passed by reference.
I prefer the second one, because with the first procedure signature it is
possible to pass an access to an already finalized object what is an error,
but want to ask you opinion which of the two procedure signatures is better.
--
Victor Porton - http://portonvictor.org
next reply other threads:[~2017-08-06 21:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-06 21:16 Victor Porton [this message]
2017-08-06 22:01 ` Limited object by reference or access argument? Victor Porton
2017-08-06 23:21 ` Victor Porton
2017-08-07 0:35 ` Victor Porton
2017-08-07 23:31 ` Randy Brukardt
2017-08-07 14:10 ` Jere
2017-08-07 23:28 ` Randy Brukardt
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