Re: Proposed change to BC iterator parameters

["Steve" <nospam_steved94@comcast.net>]

"Simon Wright" <simon@pushface.org> wrote in message
news:x7vwu921u54.fsf@smaug.pushface.org...
> "Steve" <nospam_steved94@comcast.net> writes:
>
> > "Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message
> > news:wccekvc2rol.fsf@shell01.TheWorld.com...
> > [snip]
> > >
> > > I don't understand the point of Param_Type and Param above.  If you
want
> > > to pass extra information to Apply, nest the instantiation in a place
> > > where it can see that data.
> >
> > The reason for Param_Type and Param is to avoid using data outside of
the
> > scope of the Apply routine except for the arguments to the Apply
machine.
> > It comes from that old school of thought:
> >   Avoid global data
> >   All inputs and outputs of a procedure should appear in their parameter
> > lists
> >
> > Following these simple guidelines usually makes code a lot easier to
follow.
>
> I see these extensions were added to the BCs on 1 Dec 1999, in
> response to a request from a user (also called Steve!)
>
That is why I felt compelled to explain my reasoning in this thread.

Steve
(The Duck)
(The Same Steve)

> -- 
> Simon Wright                               100% Ada, no bugs.