From: Matthew Heaney <matthew_heaney@acm.org>
Subject: Re: Why a PROGRAM ERROR?
Date: 1998/12/11
Date: 1998-12-11T00:00:00+00:00 [thread overview]
Message-ID: <m3yaofmpon.fsf@mheaney.ni.net> (raw)
In-Reply-To: 3670178F.8751F9B9@nowhere.com
Rusnak <bogus@nowhere.com> writes:
> I have the following code in a generic package (or code similar to it
> anyway):
>
>
> Given a tagged type "My_Instance" and a type defined as
>
> type My_Class_Object_Type is access all My_Instance'Class;
>
> I have a function in the spec/body, defined in the body as
>
> function Unpack(The_Object : access My_Instance'Class)
> Core_Text : String)
> return Command_Object
> is
> Return_Value : Command_Object;
> begin
> . . .
> Command_Object.The_Object :=
> My_Class_Object_Type(The_Object);
> . . .
> end Unpack;
>
>
> Any time I try to cast the anonymous access type to
> My_Instance'Class to the type My_Class_Object_Type,
> a program error is raised. Why is this the case, why is the
> error not caught at compile time, and how can I resolve
> the error? It seems to only occur when a cast like this one is
> made inside an instantiation of a generic package.
>
> Any help is greatly appreciated.
Is it possible that you're following a path that doesn't include a
return statement (because of an internal exception, perhaps)? If you're
getting Program_Error when you execute a function, that's usually the
reason.
next prev parent reply other threads:[~1998-12-11 0:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-10 0:00 Why a PROGRAM ERROR? Rusnak
1998-12-11 0:00 ` Matthew Heaney [this message]
1998-12-11 0:00 ` Why a PROGRAM ERROR? A GNAT bug? Rusnak
1998-12-11 0:00 ` dewar
1998-12-14 0:00 ` Why a PROGRAM ERROR? Robert I. Eachus
1998-12-11 0:00 ` dennison
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