Hola! So, the arguments passed to macros are by reference and not by value? I 
could have known of course, they are simple expansions, but I’d like to be 
sure. IfI assign to a variable inside a vardef macro and that variable is not 
’save’d I’m changing the original?

G

> On 16 Mar 2020, at 09:31, Taco Hoekwater <t...@elvenkind.com> wrote:
> 
> 
> 
>> On 15 Mar 2020, at 11:22, Gerben Wierda <gerben.wie...@rna.nl> wrote:
>> 
>> I would like a vardef macro to return the pair of a picture and a bounding 
>> box. I don't want to use the setbound operator, because as soon as I do 
>> that, I cannot access the components of the picture anymore with pathpart.
>> 
>> I found metapost vardef returning multiple values on StackExchange but that 
>> is about returning multiple values of the same numeric type. Is it possible 
>> to have vardef return a set of (picture, path) or (picture, picture) in some 
>> way? If not, I need to make two vardef macros for each result type.
> 
> Sure, using that same endgroup,begingroup trick. But since there is no 
> multi-assignment in metapost that doesn’t you help much.
> Either two separate vardefs or passing the to-be-assigned variable(s) as an 
> extra argument(s) are generally more practical.
> 
> Best wishes,
> Taco
> 
> 
> 
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