Re: multiple values in a return from function

• To: info-dylan@ai.mit.edu
• Subject: Re: multiple values in a return from function
• From: Chris Double <chris@double.co.nz>
• Date: Fri, 11 Feb 2000 02:15:03 -0500 (EST)
• Organization: None.
• References: <30Mo4.10657$pH6.368416@newsread1.prod.itd.earthlink.net>
• Sender: Chris.Double@DOUBLEC
• User-Agent: Gnus/5.070097 (Pterodactyl Gnus v0.97) Emacs/20.4
• Xref: traf.lcs.mit.edu comp.lang.dylan:11556

"John Whittaker" <johncwhi@earthlink.net> writes:

> define method compute-solar-position( epoch-day :: <integer> ) =>
>   ( results :: false-or( <astro-position>))
   [...snip...]
> 
>    values( right-ascension, declination );
> end method;

It's possibly because you are declaring the return result as being a
single value (of type false or instance of class <astro-position>),
whereas you are actually returning two values. The compiler will be
ignoring the second value.

Try it with just (ie. no return value declared):

> define method compute-solar-position( epoch-day :: <integer> )
   [...snip...] 
>    values( right-ascension, declination );
> end method;

Chris.
-- 
http://www.double.co.nz/dylan

• multiple values in a return from function
• From: "John Whittaker" <johncwhi@earthlink.net>

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