From: "Bob Fletcher" <bob@radge.globalnet.co.uk>
Subject: run-time type identification
Date: 1998/09/03
Date: 1998-09-03T00:00:00+00:00 [thread overview]
Message-ID: <01bdd72e$49ee66b0$f330ea9e@ukp03332> (raw)
Is there any equivalent in Ada 95 to the C++ "dynamic_cast" operator?
For example, say you have a class A, and a derived class A2.
In the package for class A there is also:
type A_Ptr is access A'Class;
You can assign an access to an object of class A2 to a variable of type
A_Ptr, but, as far as I know, cannot then de-reference the A_Ptr in such a
way that the extra bits of class A2 are accessible.
It seems to me that this is something that would make a lot of sense when
dealing with class-wide access types, which can easily be used to go up the
object heirarchy, but not, as far as I know, to go back down, (without
messing about with unchecked_conversion).
Bob Fletcher
bob@radge.globalnet.co.uk
next reply other threads:[~1998-09-03 0:00 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-09-03 0:00 Bob Fletcher [this message]
1998-09-03 0:00 ` run-time type identification Matthew Heaney
1998-09-03 0:00 ` Bob Fletcher
1998-09-03 0:00 ` Matthew Heaney
1998-09-03 0:00 ` Steve Sabljak
1998-09-03 0:00 ` Matthew Heaney
1998-09-03 0:00 ` Steve Sabljak
1998-09-03 0:00 ` Tucker Taft
1998-09-03 0:00 ` Samuel Tardieu
1998-09-03 0:00 ` Bob Fletcher
1998-09-03 0:00 ` Fergus Henderson
1998-09-03 0:00 ` Matthew Heaney
1998-09-06 0:00 ` Samuel Tardieu
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