Hi Eric,
you could use this ...
Those were the words of [EMAIL PROTECTED]:
> Hi !
>
> Newbie question !!!
>
> Is it possible to test a lack of argument in a function ?
> I try things like this but... it doesn't work !
unset!: do [type?] ; this defines unset!
tst: func [
{help for tst...}
x [integer! unset!] ; allow unset! values
][
if not value? 'x [ ; test if x has got a value, use '
; to get x litarally you'd get en error
; with unset values otherwise
help tst
exit ; exit the function
]
print x
]
if you want to use tst without args in a script, you have to
use it at the end of a paren! e.g. (tst) because tst will eat
up everything that follows
>> tst
help for tst...
Arguments:
x -- (integer unset)
>> tst 3
3
>> (tst)
help for tst...
Arguments:
x -- (integer unset)
>> tst "a"
** Script Error: tst expected x argument of type: integer unset.
** Where: tst "a"
regards,
Ingo
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