From: Josh Cheek Date: 2013-07-25T01:03:30+09:00 Subject: Re: class <=> module --089e0158cc32ccd37e04e2440c11 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Wed, Jul 24, 2013 at 10:25 AM, Jes=FAs Gabriel y Gal=E1n < jgabrielygalan@gmail.com> wrote: > On Wed, Jul 24, 2013 at 3:34 PM, Josh Cheek wrote: > > On Wed, Jul 24, 2013 at 7:51 AM, wrote: > >> > >> Am 24.07.2013 14:35, schrieb Josh Cheek: > >>> > >>> On Wed, Jul 24, 2013 at 1:10 AM, >>> > wrote: > >>> > >>> > >>> And you forgot to mention: classes can inherit only from a single > >>> other > >>> class (a conscious decision by Matz), but you can include many > >>> modules. > >>> Seems difficult to unify that in one concept. > >>> > >>> > >>> That seems inaccurate to me: > >>> > >>> C1 =3D Class.new Object > >>> C2 =3D Class.new C1 > >>> C3 =3D Class.new C2 > >> > >> > >> I was alluding to multiple inheritance, meaning a class > >> inherits _directly_ from more than one superclass. > >> > > > > I still don't understand. I showed that you can inherit from multiple > > classes like you can inherit from multiple modules. Yes there are other > > differences, but this does not seem to be one of them. Perhaps you thin= k > > that modules have some sort of fancier inheritance? If so, this is not > the > > case. When you include a module, an anonymous class with the module's > > methods gets inserted as the superclass. > > You cannot extend from arbitrary classes. If I want to create a class > that extends String and Hash, for example, I can't. > On the other hand I can extend any number of arbitrary modules. > > Jesus. > > I'm not sure that's what he was trying to say. --089e0158cc32ccd37e04e2440c11 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Wed, Jul 24, 2013 at 10:25 AM, Jes=FAs Gabriel y Gal=E1n <jgabri= elygalan@gmail.com> wrote:
On Wed, Jul 24, 2013 at 3:34 PM, Jo= sh Cheek <josh.cheek@gmail.com> wrote:
> On Wed, Jul 24, 2013 at 7:51 AM, <sto.mar@web.de> wrote:
>>
>> Am 24.07.20= 13 14:35, schrieb Josh Cheek:
>>>
>>> On Wed, Jul 24, 2013 at 1:10 AM, <sto.mar@web.de
>>> <mailto:sto.mar@web.de>> wrote:
>>>
>>>
>>> =A0 =A0 And you forgot to mention: classes can inherit only fr= om a single
>>> other
>>> =A0 =A0 class (a conscious decision by Matz), but you can incl= ude many
>>> modules.
>>> =A0 =A0 Seems difficult to unify that in one concept.
>>>
>>>
>>> That seems inaccurate to me:
>>>
>>> C1 =3D Class.new Object
>>> C2 =3D Class.new C1
>>> C3 =3D Class.new C2
>>
>>
>> I was alluding to multiple inheritance, meaning a class
>> inherits _directly_ from more than one superclass.
>>
>
> I still don't understand. I showed that you can inherit from multi= ple
> classes like you can inherit from multiple modules. Yes there are othe= r
> differences, but this does not seem to be one of them. Perhaps you thi= nk
> that modules have some sort of fancier inheritance? If so, this is not= the
> case. When you include a module, an anonymous class with the module= 9;s
> methods gets inserted as the superclass.

You cannot extend from arbitrary classes. If I want to create a= class
that extends String and Hash, for example, I can't.
On the other hand I can extend any number of arbitrary modules.

Jesus.


I'm not sure that's what he was trying = to say.
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