Re: [Chicken-users] symbol->string

[Sven . Hartrumpf]

Hello Thomas.

> If you want alphabetic ordering, you should avoid symbol->string, because
> it copies the name of the symbol to a new string -- this is necessary as
> Scheme's strings are mutable objects!

With some exceptions, like ... symbol->string :-)
"It is an error to apply mutation procedures like string-set! to
strings returned by this procedure."
from
<www.schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-9.html#%_sec_6.3.3>

> I would suggest accessing the name
> slot of the symbol directly and defining
>
>     (define (symbol-compare a b)
>       (##sys#check-symbol a 'symbol-compare)
>       (##sys#check-symbol b 'symbol-compare)
>       (string-compare (##sys#slot a 1) (##sys#slot b 1)))
>
> I hope that helps,

Thanks, I will test it now.
Sven

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