Aaron Sherman <[EMAIL PROTECTED]> writes:
> On Thu, 2002-09-12 at 06:46, Piers Cawley wrote:
>
>> Here's the classic example of mutual recursion:
>>
>> sub even ($n) {
>> given $n {
>> when 0 { return 1 };
>> default { odd($n-1) };
>> }
>> }
>>
>> sub odd ($n) {
>> given $n {
>> when 0 { return }
>> default { even($n-1) };
>> }
>> }
>>
>> even(2);
>>
>> Which throws C<< [prefix::val (not implemented) even] Prefix operator odd
>> >> while compiling the tree. Curse!
>>
>
> That's because the compiler does not currently handle the case of
> calling a function before it's defined. Use:
>
> sub odd($n);
>
> first to declare the function. This gets you a warning about redefining
> odd, but that's ignorable.
Odd... could have sworn I tried that. And I was under the impression
that official format for this was C<< sub odd($n) {...} >>, which
definitely doesn't work.
--
Piers
"It is a truth universally acknowledged that a language in
possession of a rich syntax must be in need of a rewrite."
-- Jane Austen?
