HaloO Luke,
you wrote:
All in all, generic equality and comparison is something that Perl 5
did really poorly. Some people overloaded eq, some overloaded ==,
some wrote a ->equal method, and there was no way to shift between the
different paradigms smoothly. This is one of the times where we h
I just realized something that may be very important to my side of the
story. It appears that I was skimming over your example when I should
have been playing closer attention:
On 7/18/05, Damian Conway <[EMAIL PROTECTED]> wrote:
> Consider the following classes:
>
>class A {..
On Sun, Jul 17, 2005 at 18:23:02 +, Luke Palmer wrote:
> > * Coercion of parameters and a class's willingness to coerce
> > into something is a better metric of distance
>
> Well, if you think metrics at all are a good way to do dispatch.
Well, we do have a notion of "close
On 7/17/05, Damian Conway <[EMAIL PROTECTED]> wrote:
> "You keep using that word. I do not think
> it means what you think it means"
> -- Inigo Montoya
Quite. I abused Liskov's name greatly here. Sorry about that.
Anyway, my argument is founded on anothe
"You keep using that word. I do not think
it means what you think it means"
-- Inigo Montoya
Luke Palmer wrote:
>>Recently I discussed MMD with chromatic, and he mentioned two things
>>that were very important, in my opinion:
>>
>>* The Liskov subst
On 7/17/05, Yuval Kogman <[EMAIL PROTECTED]> wrote:
> I have another view.
>
> The Num role and the Str role both consume the Eq role. When your
> class tries to both be a Num and a Str, == conflicts.
>
> I have two scenarios:
>
> class Moose does Num does Str { ... }
>
> # Moos
Atmosphere: Whooosh
Mug: Clunk
Luke's head: Thud
Luke's wall: Dum
Luke: Ow
Violence is fun!
On Sat, Jul 16, 2005 at 19:02:49 -0600, Luke Palmer wrote:
> I'm going to have some coffee mugs thrown at me for saying this, but perhaps:
>
> Generic StringNumericIdentity
>
On 7/16/05, Luke Palmer <[EMAIL PROTECTED]> wrote:
> I'm going to have some coffee mugs thrown at me for saying this, but perhaps:
>
> Generic StringNumericIdentity
>+---+---++---+
> Equality |== |
On 16 Jul 2005 12:22:31 -, David Formosa (aka ? the Platypus)
<[EMAIL PROTECTED]> wrote:
> On Sat, 16 Jul 2005 12:14:24 +0800, Autrijus Tang
> <[EMAIL PROTECTED]> wrote:
>
> [...]
>
> > On Sat, Jul 16, 2005 at 12:24:21AM +0300, Yuval Kogman wrote:
> >> > There is a new generic comparison oper
On Sat, 16 Jul 2005 12:14:24 +0800, Autrijus Tang
<[EMAIL PROTECTED]> wrote:
[...]
> On Sat, Jul 16, 2005 at 12:24:21AM +0300, Yuval Kogman wrote:
>> > There is a new generic comparison operator known as ~~.
>>=20
>> ~~ is just Eq, there is also Ord
>
> Hmm, <~ and ~> for generic comparators? ;
On Sat, Jul 16, 2005 at 12:14:24 +0800, Autrijus Tang wrote:
> Hmm, <~ and ~> for generic comparators? ;)
EEK!
i think <, <=>, >, == etc are enough for the ord and Eq class -
that's what most people overload in p5 anyway.
> > and Show
>
> That is already prefix ~ for that.
How do you describe
On Sat, Jul 16, 2005 at 12:24:21AM +0300, Yuval Kogman wrote:
> > There is a new generic comparison operator known as ~~.
>
> ~~ is just Eq, there is also Ord
Hmm, <~ and ~> for generic comparators? ;)
> and Show
That is already prefix ~ for that.
> and a multitude of other things, which are m
On Fri, Jul 15, 2005 at 10:01:43 +0800, Autrijus Tang wrote:
> On Fri, Jul 15, 2005 at 02:38:22AM +0300, Yuval Kogman wrote:
> > As I see it == is the generic comparison, and 'eq' is == with
> > coercing parameters (in Haskell it'd be
> > eq :: (Show a) => a -> a -> Bool or so... Isn't that lovely?
On Fri, Jul 15, 2005 at 02:38:22AM +0300, Yuval Kogman wrote:
> As I see it == is the generic comparison, and 'eq' is == with
> coercing parameters (in Haskell it'd be
> eq :: (Show a) => a -> a -> Bool or so... Isn't that lovely?)
There is a new generic comparison operator known as ~~.
The dispa
Haskell has this very nice consistency I'll diverge into perl
terms...
The 'Show' role provides consistent stringification semantics for
any type that does the role. It can even 'derive' the role, getting
a method autogenerated.
The 'Ord' role provides semantics for ordered types. A typical
s
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