how to express "struct"

Qiong Cai <[email protected]>
Newsgroups gmane.comp.tex.metapost
Message-ID <CAOrq85HOY=MKQ_O3ouAWpdrByQhsf4CiHw0Oy5RkLq7M=9-0yg@mail.gmail.com> 
Hi,

I am trying to define a C-like struct in metapost:

       struct Pixel {
             numeric x;
             numeric y;
             numeric val;
       };

What's the best way to define such a struct in MetaPost?

Thanks
Qiong

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