Austin Hastings said:
Let's look at boolean xor:
if ($a xor $b xor $c) {...}
should succeed only when exactly one of ($a, $b, $c) is true.
I think it is generally accepted that xor is true iff an odd nnumber of
its argumnets are true.
--
Paul Johnson - [EMAIL PROTECTED]
John Macdonald wrote:
if ($a xor $b xor $c) {...}
should succeed only when exactly one of ($a, $b, $c) is true.
That's not the definition of xor that I learned in school.
It's taking a simplified form of the definition that works
for two arguments and then expanding it to multiple
arguments -
On Tue, Mar 23, 2004 at 07:35:39AM +1100, Damian Conway wrote:
: However I do think that, now we have Cone to carry the load of exists
: uniquely, Larry will probably decide that Cxor is strictly binary, and
: hence generalizes to the parity form in the n-ary case.
Hmm, I probably will. :-)
-Original Message-
From: Luke Palmer [mailto:[EMAIL PROTECTED]
Austin Hastings writes:
From: Luke Palmer [mailto:[EMAIL PROTECTED]
Joe Gottman writes:
2) Do all of the xor variants have the property that
chained calls return true if exactly one input
parameter is
I'm not sure that having quaternary logic in Perl 6 is necessarily a good
idea. Why stop only at four states?
--
... though the Japanese must be the most stupid people... I'm sure I
read somewhere that Tokyo has the densest population in the world...
- Gid Holyoake, sdm.
Austin Hastings wrote:
Granted. But some pitaph is going to come along and find a novel new use for
zip outside of loops. And then it's going to be in an expression of some kind,
where the parser won't know what to do...
%hash = @keys @values;
Oh, and it's petaQ not pitaph.
Hey...wait a
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Simon Cozens
I'm not sure that having quaternary logic in Perl 6 is necessarily a good
idea. Why stop only at four states?
Indeed:
undef, unset (disagreeable undef, a la NaN), nocare (always matches),
[EMAIL PROTECTED] (Austin Hastings) writes:
I'm not sure that having quaternary logic in Perl 6 is necessarily a good
idea. Why stop only at four states?
Total about twelve possible states plus junctions, of which eight or nine
would be 'useful', and only three would be knowingly used.
-Original Message-
From: Damian Conway [mailto:[EMAIL PROTECTED]
Austin Hastings wrote:
Granted. But some pitaph is going to come along and find a
novel new use for zip outside of loops. And then it's going
to be in an expression of some kind, where the parser won't
know
Austin Hastings wrote:
Oh, and it's petaQ not pitaph.
Umm, no. It's pitaph, vice japh. (Better than gdtsfhogwaph, certainly.)
Oh, then in that case:
english
You called me a pain in the ass?
I should kill you were you stand!!
/english
;-)
BTW, how did you generate that , or
Dear All,
I think that the broken bar is dangerous. Why:
It can be mixed up with the normal bar |. In some fonts it looks the same.
And to many people it is not 100% clear, which of the two bars is the broken
one and which not.
Off course it is possible to avoid this, but that is not solving
At 9:19 PM + 3/20/04, Simon Cozens wrote:
[EMAIL PROTECTED] (Austin Hastings) writes:
I'm not sure that having quaternary logic in Perl 6 is necessarily a good
idea. Why stop only at four states?
Total about twelve possible states plus junctions, of which eight or nine
would be 'useful',
Well, maybe we should use yen (¥) instead. It even looks like a zipper.
(Of course, we'll leave out the little problem that half the people
in Japan would read it as a backslash wannabe...that's not really
a problem since a zipper would only be used where an operator is
expected, and backslash
Joe Gottman writes:
2) Do all of the xor variants have the property that chained calls
return true if exactly one input parameter is true?
I would imagine not. Cxor is spelled out, and by definition XOR
returns parity. On the other hand, the junctive ^ (one()) is exactly
one.
3)
-Original Message-
From: Luke Palmer [mailto:[EMAIL PROTECTED]
Sent: Friday, 19 March, 2004 10:06 PM
To: Joe Gottman
Cc: Perl6
Subject: Re: Some questions about operators.
Joe Gottman writes:
2) Do all of the xor variants have the property that
chained calls return true
Austin Hastings writes:
-Original Message-
From: Luke Palmer [mailto:[EMAIL PROTECTED]
Sent: Friday, 19 March, 2004 10:06 PM
To: Joe Gottman
Cc: Perl6
Subject: Re: Some questions about operators.
Joe Gottman writes:
2) Do all of the xor variants have the property
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