From: John Harbaugh <john.s.harbaugh2@boeing.com>
Subject: Re: Subtypes do not Statically Match
Date: 1999/07/01
Date: 1999-07-01T00:00:00+00:00 [thread overview]
Message-ID: <377B9D0B.40AD4D56@boeing.com> (raw)
In-Reply-To: 377B20FD.C288B308@Maths.UniNe.CH
Quite true. The access parameter was chosen because we want to pass a
pointer from a list (classwide pointers actually), rather than to force
passing by reference.
Cheers,
- John
Gautier wrote:
>
> > function The_Handle(Obj : access Object) return String_Ref is
> ^
> A detail: you don't need the access there ( C's * or Pascal's VAR ):
> the "in" parameter will pass a reference for that object; an explicit
> "access" might even cause slowdowns (pointer on pointer) in some cases!
>
> > begin
> > return Obj.Component'access;
> > --Error: object subtype must statically match designated subtype
> > end;
>
> --
> Gautier
>
> --------
> http://members.xoom.com/gdemont/
next prev parent reply other threads:[~1999-07-01 0:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-06-30 0:00 Subtypes do not Statically Match John Harbaugh
1999-06-30 0:00 ` James S. Rogers
1999-07-01 0:00 ` John Harbaugh
1999-07-02 0:00 ` Robert I. Eachus
1999-07-01 0:00 ` Ted Dennison
1999-07-01 0:00 ` Gautier
1999-07-01 0:00 ` John Harbaugh [this message]
1999-07-01 0:00 ` Robert A Duff
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