Re: [Chicken-users] ANN: eping

[Jörg F . Wittenberger]

On Aug 22 2013, Michele La Monaca wrote:

> How can I check if a symbol is bound to a value?

Oleg Kiselyov's receipe might be helpful here:
http://okmij.org/ftp/Scheme/macro-symbol-p.txt

> I would like to do this:
>
> (define host "example.com")
>
> (eping host)      ; host is evaluated
> (eping localhost) ; localhost is treated as a symbol
>
> with a macro like that:
>
> (define-syntax eping
>  (syntax-rules ()
>    ((_ h)
>     (if (and (symbol? 'h) (bound? 'h))
>       (_eping h)
>       (_eping (symbol->string '|h|))))))










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