[plt-scheme] An Introduction to PLT Scheme with Pictures - macros

What macro example are you following?

It doesn't work because the macro doesn't allow moving it's name from the beginning of an expression.

See the Planet implementation of infix:

http://planet.plt-scheme.org/package-source/dyoo/infix.plt/1/1/doc.txt

rac




On Feb 14, 2010, at 11:36 AM, ih wrote:

> Hi,
> I'm relatively new to scheme and had a question about macros while
> going through the tutorial "An Introduction to PLT Scheme with
> Pictures".
> 
> I tried to follow the macro example and create infix addition e.g. (3
> in-add 4) evaluates to 7
> 
> (define-syntax in-add
> (syntax-rules ()
>   [(a in-add b)
>    (+ a b)]))
> 
> This did not work so my main question is how would one do this (if
> possible)?  Thanks.
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