Hi,
Yuval Kogman wrote:
> On Sat, Aug 27, 2005 at 19:16:55 +0200, Ingo Blechschmidt wrote:
>
>> my ($head, [EMAIL PROTECTED]) := foo();
>
> if foo returns a list of scalars >=2 this is like parameter
> unpacking:
>
> my ($head, [EMAIL PROTECTED]) = *foo();
[...]
Right, but I wanted to drive at the difficulty of making this work,
sorry if I was unclear.
($head, [EMAIL PROTECTED]) := foo(); # (Note: := here, not =)
This is not a problem, because :='s LHS is a subroutine signature, which
means the necessary magic is already there.
But there is a problem with the ordinary assignment form:
($head, @tail) = foo();
If the LHS is an ordinary list (i.e., if we don't use help from the
grammar/macros), then the @tail would get flattened before it reached
the assignment operator. This is turn would cause the statement not to
DWIM:
my ($head, @tail) = foo(); # is really
my ($head, @tail);
($head, @tail) = foo(); # is really (as @tail is empty)
($head, ()) = foo(); # is really
($head) = foo(); # is really
$head = foo(); # !!!
> for this I think we need an easier solution... Perhaps flattenning
> foo instead of adding a slurp, or making yadda yadda in lvalue throw
> it's arguments away silently:
>
> my ($foo, $bar, ...) := foo();
I like that! :)
--Ingo
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