Re: [Oorexx-devel] Some changes coming to USE STRICT ARG

[Rick M. <obj...@gm...>]

Hmm, another possibility for the CONDITION keyword would be TRUE and FALSE

ASSERT TRUE (a~datatype('w'))

ASSERT FALSE (.nil == a)

Either TRUE or false is allowed, followed by the other keywords for raising
the error messages.

Rick

On 4/12/07, Rony G. Flatscher <Ron...@wu...> wrote:
>
> Rick McGuire wrote:
> > After some off-list conversations with a long time Rexx user whose
> > opinion I highly respect, I'm going to be making a few changes to USE
> > STRICT ARG.
> >
> > The first change is actually a bit of an enhancement.  I'm going to
> > allow a default value to be specified on the normal form of the
> > instruction.  Thus you can simply do
> >
> > USE ARG a, b=1
> >
> > if you like.  This form will not raise any min/max/omitted error
> > conditions on your behalf, but will make handling of default values
> > simpler.
> >
> > The second change is the "promotion" of the ASSERT option on USE ARG.
> > ASSERT is turning out to be less useful than I had originally
> > envisioned because of the generic error message it issues.  However,
> > that sort of capability is still nice for general error checking and
> > conditions, so I'm going to promote it to a full fledged instruction.
> >
> > ASSERT a~datatype('w'), b~datatype('w')
> >
> > Using the list form of the conditional.  This instruction can be
> > placed anywhere you want to make a data insertion, and is generally
> > more flexible than the ASSERT keyword stuck on ARG.
> Also, ASSERT in that form could be used for pre- and postconditions as
> well.
>
> ---
>
> Ad too generic error messages: how about allowing to supply an optional
> string to be used in the generic error message? Something like:
>
>     ASSERT a~datatype('w'), b~datatype('w') ERRORMESSAGE ("argument not
> a whole number")  -- or any
>
> As ASSERT becomes an own keyword instruction there would enough space on
> a line to allow for that optional error message (which should be
> buildable from an expression as well).
>
> ---rony
>
>
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