From: Andy Askey <ajaskey@mindspring.com>
Subject: Checking Access Parameters to Procedures
Date: 2000/03/06
Date: 2000-03-07T02:50:45+00:00 [thread overview]
Message-ID: <q6r8cscb2h8c9pmjhei7q1fk8hn6gimfpj@4ax.com> (raw)
Another, probably simple, question....
I want to check if a value passed into a procedure is NULL. For
example:
package tst_pkg is
type my_ttype is tagged private;
procedure tst_proc(this : access my_ttype'class);
private
type my_ttype is tagged
record
i : integer;
end record;
end tst_pkg;
package body tst_pkg is
procedure tst_proc(this : access my_ttype'class) is
begin
if (this = NULL) then
....
end if;
end tst_proc;
end tst_pkg;
This does not compile so I tried every combination I can think of and
nothing worked so far. How can I test if "this" is a NULL pointer?
Thanx.
--
Andy Askey
ajaskey@mindspring.com
next reply other threads:[~2000-03-06 0:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-03-06 0:00 Andy Askey [this message]
2000-03-06 0:00 ` Checking Access Parameters to Procedures David Botton
2000-03-07 0:00 ` Mark Lundquist
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