Re: Why to use Moose roles ever?

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Victor,

My experience has always been that Moose is as flexible as possible without
causing fundamental logical conflicts (And their companion hard to debug
issues).  It is important to note that a Moose Role is not a one for one
match to other programming languages implementations for a role.


https://metacpan.org/pod/distribution/Moose/lib/Moose/Manual/Roles.pod#Roles-Versus-Abstract-Base-Classes

The question you are asking also falls in the line of a bigger question
that is partially outside of the scope of Moose implementation.


http://www.javaworld.com/article/2076814/core-java/inheritance-versus-composition--which-one-should-you-choose-.html

   https://en.wikipedia.org/wiki/Composition_over_inheritance

Are you aware of the following two pieces of Moose documentation?  The may
help to resolve some specifics around any specific implementations.


https://metacpan.org/pod/distribution/Moose/lib/Moose/Manual/Roles.pod#METHOD-CONFLICTS


https://metacpan.org/pod/distribution/Moose/lib/Moose/Manual/Roles.pod#METHOD-EXCLUSION-AND-ALIASING

Best Regards,

Jed

On Wed, Aug 10, 2016 at 6:00 AM, Victor Porton <[email protected]> wrote:

> Moose roles have some limitations, such as inability to override a
> method in a class which "with"es the role.
>
> But I can use an abstract base class instead of a role.
>
> Are there any real situations where roles are better than base classes?
> With examples, please.
>

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<div dir=3D"ltr">Victor,<div><br></div><div>My experience has always been t=
hat Moose is as flexible as possible without causing fundamental logical co=
nflicts (And their companion hard to debug issues).=C2=A0 It is important t=
o note that a Moose Role is not a one for one match to other programming la=
nguages implementations for a role.</div><div><br></div><div>=C2=A0 =C2=A0 =
<a href=3D"https://metacpan.org/pod/distribution/Moose/lib/Moose/Manual/Rol=
es.pod#Roles-Versus-Abstract-Base-Classes">https://metacpan.org/pod/distrib=
ution/Moose/lib/Moose/Manual/Roles.pod#Roles-Versus-Abstract-Base-Classes</=
a><br></div><div><br></div><div>The question you are asking also falls in t=
he line of a bigger question that is partially outside of the scope of Moos=
e implementation.</div><div><br></div><div>=C2=A0 =C2=A0<a href=3D"http://w=
ww.javaworld.com/article/2076814/core-java/inheritance-versus-composition--=
which-one-should-you-choose-.html">http://www.javaworld.com/article/2076814=
/core-java/inheritance-versus-composition--which-one-should-you-choose-.htm=
l</a><br></div><div><br></div><div>=C2=A0 =C2=A0<a href=3D"https://en.wikip=
edia.org/wiki/Composition_over_inheritance">https://en.wikipedia.org/wiki/C=
omposition_over_inheritance</a></div><div><br></div><div>Are you aware of t=
he following two pieces of Moose documentation?=C2=A0 The may help to resol=
ve some specifics around any specific implementations.</div><div><br></div>=
<div>=C2=A0 =C2=A0<a href=3D"https://metacpan.org/pod/distribution/Moose/li=
b/Moose/Manual/Roles.pod#METHOD-CONFLICTS">https://metacpan.org/pod/distrib=
ution/Moose/lib/Moose/Manual/Roles.pod#METHOD-CONFLICTS</a><br></div><div><=
br></div><div>=C2=A0 =C2=A0<a href=3D"https://metacpan.org/pod/distribution=
/Moose/lib/Moose/Manual/Roles.pod#METHOD-EXCLUSION-AND-ALIASING">https://me=
tacpan.org/pod/distribution/Moose/lib/Moose/Manual/Roles.pod#METHOD-EXCLUSI=
ON-AND-ALIASING</a><br></div><div><br></div><div>Best Regards,</div><div><b=
r></div><div>Jed</div></div><div class=3D"gmail_extra"><br><div class=3D"gm=
ail_quote">On Wed, Aug 10, 2016 at 6:00 AM, Victor Porton <span dir=3D"ltr"=
>&lt;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</=
a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Moose roles have som=
e limitations, such as inability to override a<br>
method in a class which &quot;with&quot;es the role.<br>
<br>
But I can use an abstract base class instead of a role.<br>
<br>
Are there any real situations where roles are better than base classes?<br>
With examples, please.<br>
</blockquote></div><br></div>

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