Suppose we have a function that takes an argument and returns something
with the same type as that argument. One previous suggestion is this:
sub identity ((::a) $x) returns ::a { return(...) }
This is fine if both invariants in the "the meaning of 'returns'" thread
are observed, since the i
What do &print and &say return?
"fail" would be great on errors. On success, they return "1" now, which
doesn't look very useful. How about returning the printed string? Unless
called in void context, of course.
(This introduces a potential semipredicate problem when looking at the
return value o
Hi,
http://use.perl.org/~autrijus/journal/25337:
> deref is now 0-level; $x = 3; $y = \$x; $y++. # now an exception
my $arrayref = [1,2,3];
say $arrayref.ref;# Ref or Array?
say $arrayref.isa("Ref"); # true or false?
say $arrayref.isa("Array"); # false or true?
Hi,
my @array = ;
my $arrayref := @array;
push $arrayref, "c";
say [EMAIL PROTECTED]; # a b c d, no problem
$arrayref = [];
say [EMAIL PROTECTED]; # d e f, still no problem
$arrayref = 42;# !!! 42 is not a Ref of Array
Sho
Hi,
is binding hashes to arrays (or arrays to hashes) legal? If not, please
ignore the following questions :)
my @array = ;
my %hash := @array;
say %hash; # b
push @array, ;
say %hash; # f?
%hash = "Y";
say [EMAIL PROTECTED]; # ???
# (o
On Sat, Jul 30, 2005 at 02:14:52PM +0200, Ingo Blechschmidt wrote:
: Hi,
:
: http://use.perl.org/~autrijus/journal/25337:
: > deref is now 0-level; $x = 3; $y = \$x; $y++. # now an exception
:
: my $arrayref = [1,2,3];
:
: say $arrayref.ref;# Ref or Array?
Array.
: say
On Sat, Jul 30, 2005 at 02:33:15PM +0200, Ingo Blechschmidt wrote:
: Hi,
:
: my @array = ;
: my $arrayref := @array;
:
: push $arrayref, "c";
: say [EMAIL PROTECTED]; # a b c d, no problem
:
: $arrayref = [];
: say [EMAIL PROTECTED]; # d e
Except that you've rebound the container. Hmm, maybe the original
binding is an error.
Larry
On Sat, Jul 30, 2005 at 02:59:02PM +0200, Ingo Blechschmidt wrote:
: Hi,
:
: is binding hashes to arrays (or arrays to hashes) legal? If not, please
: ignore the following questions :)
:
: my @array = ;
: my %hash := @array;
:
: say %hash; # b
: push @array, ;
: say
Hi,
Larry Wall wrote:
> On Sat, Jul 30, 2005 at 02:33:15PM +0200, Ingo Blechschmidt wrote:
> : my @array = ;
> : my $arrayref := @array;
[...]
> : $arrayref = 42;# !!! 42 is not a Ref of Array
> :
> : Should the last line be treated as
> : $arrayref = (42,);
> : wh
Hi,
Larry Wall wrote:
> Except that you've rebound the container. Hmm, maybe the original
> binding is an error.
what about:
sub foo (Array $arrayref) {...}
my @array = ;
foo @array;
The binding used by the parameter binding code does not use the
standard := operator then, right?
On 7/30/05, Larry Wall <[EMAIL PROTECTED]> wrote:
> On Sat, Jul 30, 2005 at 02:14:52PM +0200, Ingo Blechschmidt wrote:
> : say $arrayref.isa("Ref"); # true or false?
>
> False, though tied($arrayref).isa("Ref") is probably true.
In that case, how do you check if something is a ref? `if (
On Sat, 2005-07-30 at 14:56 +0300, Gaal Yahas wrote:
> (This introduces a potential semipredicate problem when looking at the
> return value of a printed "0" or "" while not using "fatal", but the
> code can use a defined guard.)
I don't know if returning the printed string is the right approach,
On Sat, Jul 30, 2005 at 09:25:12AM -0700, chromatic wrote:
: On Sat, 2005-07-30 at 14:56 +0300, Gaal Yahas wrote:
:
: > (This introduces a potential semipredicate problem when looking at the
: > return value of a printed "0" or "" while not using "fatal", but the
: > code can use a defined guard.)
On Sat, Jul 30, 2005 at 05:17:29PM +0200, Ingo Blechschmidt wrote:
: Hi,
:
: Larry Wall wrote:
: > Except that you've rebound the container. Hmm, maybe the original
: > binding is an error.
:
: what about:
:
: sub foo (Array $arrayref) {...}
:
: my @array = ;
: foo @array;
:
: The
On Sat, Jul 30, 2005 at 09:36:13AM -0700, Larry Wall wrote:
> I don't see any reason to return the string at all. It's almost never
> wanted, and you can always use .= or monkey but.
So: fail on failure bool::true on success? Pugs currently returns
bool::true.
Is there a way to tag a sub as fail
What gets called for me when someone "use"s my module? What gets called
when someone "no"s it?
L stipulates a standard syntax for import lists, and
that's probably a good thing, but then how do you pass other compile-time
requests to code that's being used?
Perhaps in light of L, we can make "use
On Sat, Jul 30, 2005 at 09:40:11AM -0700, Larry Wall wrote:
> Right, so I guess what really happens is ref autogeneration in that
> case, and there's no difference between
>
> $x = @array;
> $x := @array;
>
> Hey, who said anything about consistency? :-)
Hm, not exactly. This form:
On 7/27/05, Larry Wall <[EMAIL PROTECTED]> wrote:
> On Wed, Jul 27, 2005 at 11:00:20AM +, Luke Palmer wrote:
>> Everything that is a Num is a Complex right?
>
> Not according to Liskov. Num is behaving more like a constrained
> subtype of Complex as soon as you admit that "isa" is about both
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