Hello everybody,

I’m working on some UDOs and instruments for algorithmic purposes.
I’m used to checking the input of algorithms to ensure they are usable and meet the conditions of the code.
In Lisp, I use error printing for this use case.
Is there an equivalent in Csound that allows me to check input variables to UDOs and interrupt the program with a proper error message?

All the best,
Philipp
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I guess you could use exitnow to return as soon as an error occurs? 

On Thu, 20 Mar 2025 at 13:16, Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie> wrote:

Hello everybody,

I’m working on some UDOs and instruments for algorithmic purposes.
I’m used to checking the input of algorithms to ensure they are usable and meet the conditions of the code.
In Lisp, I use error printing for this use case.
Is there an equivalent in Csound that allows me to check input variables to UDOs and interrupt the program with a proper error message?

All the best,
Philipp
Csound mailing list
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https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
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        https://github.com/csound/csound/issues
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Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Thank you both!

I will use exitnow for this.

Philipp

> Am 20.03.2025 um 15:04 schrieb Steven Yi <stevenyi@GMAIL.COM>:
>
> I wrote an assert UDO that's in the unit tests for csound:
>
> https://github.com/csound/csound/blob/23540c213447c6b7c8c68eccc9d7853d506a028b/tests/commandline/udo/pass_by_ref.csd#L19
>
> I had been meaning to make this more of a developed UDO library but haven't done so yet, but the general idea works.
>
> On Thu, Mar 20, 2025 at 9:22 AM Rory Walsh <rorywalsh@ear.ie> wrote:
> I guess you could use exitnow to return as soon as an error occurs?
>
> On Thu, 20 Mar 2025 at 13:16, Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie> wrote:
> Hello everybody,
>
> I’m working on some UDOs and instruments for algorithmic purposes.
> I’m used to checking the input of algorithms to ensure they are usable and meet the conditions of the code.
> In Lisp, I use error printing for this use case.
> Is there an equivalent in Csound that allows me to check input variables to UDOs and interrupt the program with a proper error message?
>
> All the best,
> Philipp
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>         https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here
> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here
> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

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