From: "kat-Zygfryd" <6667@wp.pl>
Subject: Re: virtual destructors
Date: Tue, 22 Apr 2003 16:56:03 +0200
Date: 2003-04-22T14:56:09+00:00 [thread overview]
Message-ID: <b83l69$7bk$1@news.onet.pl> (raw)
In-Reply-To: u1xzuehed.fsf@nasa.gov
"Stephen Leake" <Stephe.Leake@nasa.gov> wrote in message
news:u1xzuehed.fsf@nasa.gov...
> The nearest equivalent of C++ destructors is achieved by deriving from
> a type declared in Ada.Finalization. Note that it is not a very close
> equivalent, so to be really helpful, we need to know in a larger sense
> what you are trying to do.
>
> --
> -- Stephe
I want to have destructors working on access' to class wide types,
so that when passed a variable, an actual type destructor was
called, not a one overloaded for the specific type.
example:
type Base is tagged record ... end record;
type PBase is access Base;
type CBase is access Base'Class;
type Derived is new Base with record ... end record;
type PDerived is access Derived;
type CDerived is access Derived'Class;
procedure Free is new Ada.Unchecked_Deallocation(Base,PBase);
procedure Free is new Ada.Unchecked_Deallocation(Derived,PDerived);
procedure Dispose(self: in out CBase) is
begin
--?
self := null;
end Dispose;
procedure Dispose(self: in out CDerived) is
begin
-- ?
self := null;
end Dispose;
declare
B: CBase := new Base;
D: CBase := new Derived;
begin
Dispose(B);
Dispose(D);
end;
I want both Disposes to work as they should, what should I fill them with?
Zygfryd
next prev parent reply other threads:[~2003-04-22 14:56 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-22 14:18 virtual destructors kat-Zygfryd
2003-04-22 14:27 ` Stephen Leake
2003-04-22 14:56 ` kat-Zygfryd [this message]
2003-04-22 15:45 ` kat-Zygfryd
2003-04-22 16:34 ` tmoran
2003-04-22 21:32 ` Robert A Duff
2003-04-22 17:18 ` Stephen Leake
2003-04-22 16:34 ` Simon Wright
2003-04-22 19:57 ` Stephen Leake
2003-04-22 20:19 ` Simon Wright
2003-04-22 21:23 ` Robert A Duff
2003-04-23 15:16 ` Matthew Heaney
2003-04-22 17:31 ` virtual destructors - doesn't seem to work kat-Zygfryd
2003-04-22 17:32 ` Simon Wright
2003-04-22 17:33 ` virtual destructors Matthew Heaney
2003-04-22 17:28 ` Matthew Heaney
2003-04-22 17:40 ` kat-Zygfryd
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox