On Tue, Apr 19, 2005 at 02:14:04AM +0300, wolverian wrote:
: On Mon, Apr 18, 2005 at 04:00:53PM -0700, Larry Wall wrote:
: > %num_of_lines<file> = [EMAIL PROTECTED];
: >
: > : because the Perl 5 way would put a reference to @file in the hash.
: > : Scalar context always makes references now, from what I understand.
: >
: > Interestingly, a stored reference would track the current number of
: > lines rather than taking a snapshot. But you should definitely think
: > of it as storing a reference rather than the number of lines, because
: > the ref will certainly behave differently in string context.
: >
: > Larry
:
: How sane would it be to put a reference to the instance method in the
: hash?
It seems like a sane thing to me, but that's a rather low standard.
: I think Perl 6 doesn't actually support that directly, but one can
: always do:
:
: %num_of_lines<file> = List::elems.assuming(@file);
That would need to be
%num_of_lines<file> = &List::elems.assuming(@file);
or it would assume you're trying to call a class method on a class
named List::elems.
: I'm not sure if the currying works correctly there. How does one curry
: the invocant? (I'm thinking about a situation when the method doesn't
: specify the invocant explicitly in the signature, if that makes any
: difference.)
It looks like we're getting positional currying in addition to named,
so the syntax above should work. But as it currently stands
the invocant always has an alias of $_, so you could presumably say
%num_of_lines<file> = &List::elems.assuming(_ => @file);
: I like the whole idea of bound references (to use the Pythonic term),
: although Python's syntax lends itself better to such use. Sometimes I
: wish we would require parentheses on every method and sub call. Then a
: reference to the method/sub would be simply its name without the parens.
Myself, I'd rather have the possibility of list operators. But you've
probably noticed that already. :-)
: I hope I never have to design my own language. I would be schizophrenic
: before the day ends.
That's backwards. You have to be schizophrenic before the day starts.
Larry
