Re: Optional binding

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From:

Aldo Calpini

Date:

March 7, 2005 13:30

Subject:

Re: Optional binding

Message ID:

422CC7D6.3090302@perl.it

Larry Wall wrote:
> Or, assuming you might want to generalize to N dimensions someday, just
> 
>     sub bar (*@coords) {...}
> 
> and deal with it as in Perl 5 as a variadic list.  I suppose one could say
> 
>     sub bar (*@coords is shape(3)) {...}
> 
> and get checking on the argument count.

if I understand correctly, without using multi subs:

     sub bar(@coords is shape(3)) { ... }

     bar(@xyz); # ok
     bar( [$x, $y, $z] ); # ok
     bar($x, $y, $z); # compile-time error

while:

     sub bar(*@coords is shape(3)) { ... }

     bar(@xyz); # ok
     bar( [$x, $y, $z] ); # ok
     bar($x, $y, $z); # ok
     bar <== $x, $y, $z; # still ok

am I right?

cheers,
Aldo

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