From: Nathan Broadbent <nathan.f77@...>
Date: 2012-11-13T05:37:56+09:00
Subject: [ruby-core:49264] Re: [ruby-trunk - Feature #7339][Open] Version of super that doesn't raise when super undefined

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We can already write:

    super if defined?(super)

I don't think a shortcut would be necessary for that, since it's already
quite short.


Best,
Nathan

On Tuesday, 13 November 2012, prijutme4ty (Ilya Vorontsov) wrote:

>
> Issue #7339 has been reported by prijutme4ty (Ilya Vorontsov).
>
> ----------------------------------------
> Feature #7339: Version of super that doesn't raise when super undefined
> https://bugs.ruby-lang.org/issues/7339
>
> Author: prijutme4ty (Ilya Vorontsov)
> Status: Open
> Priority: Normal
> Assignee:
> Category:
> Target version:
>
>
> =begin
> I propose new method try_super (it's possibly bad name, any suggestions)
> which would work like a super except not raising in case that super method
> undefined. It can be useful in such a situation - when module makes smth
> useful even in absence of super class.
> I use an example with Module#prepend, but similar example with
> Module#include can be created with a bit more effort.
>
>   module MyLogging
>     def info(*args)
>       $stderr.puts "Hello! You've an info message"
>       super # with super it raises when super undefined
>     end
>   end
>
>   require 'logger'
>   class Logger
>     prepend MyLogging
>   end
>
>
>   class Foo
>     prepend MyLogging
>   end
>
>   Logger.new.info 'message'
>   Foo.new.info 'message'
>
>
> In an example Foo.new.info raises an exception while really it shouldn't
> in my opinion. So try_super can be used
>
> If it doesn't broke many libraries (I believe not many of them uses super
> in cases when it raises), super can be renamed to 'super!' and more mild
> version can be 'super'.
>
> =end
>
>
>
> --
> http://bugs.ruby-lang.org/
>
>

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We can already write:<div><br></div><div>=A0 =A0 super if defined?(super)</=
div><div><br></div><div>I don&#39;t think a shortcut would be necessary for=
 that, since it&#39;s already quite short.<span></span></div><div><br></div=
>
<div><br></div><div>Best,</div><div>Nathan</div><div><br>On Tuesday, 13 Nov=
ember 2012, prijutme4ty (Ilya Vorontsov)  wrote:<br><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">
<br>
Issue #7339 has been reported by prijutme4ty (Ilya Vorontsov).<br>
<br>
----------------------------------------<br>
Feature #7339: Version of super that doesn&#39;t raise when super undefined=
<br>
<a href=3D"https://bugs.ruby-lang.org/issues/7339" target=3D"_blank">https:=
//bugs.ruby-lang.org/issues/7339</a><br>
<br>
Author: prijutme4ty (Ilya Vorontsov)<br>
Status: Open<br>
Priority: Normal<br>
Assignee:<br>
Category:<br>
Target version:<br>
<br>
<br>
=3Dbegin<br>
I propose new method try_super (it&#39;s possibly bad name, any suggestions=
) which would work like a super except not raising in case that super metho=
d undefined. It can be useful in such a situation - when module makes smth =
useful even in absence of super class.<br>

I use an example with Module#prepend, but similar example with Module#inclu=
de can be created with a bit more effort.<br>
<br>
=A0 module MyLogging<br>
=A0 =A0 def info(*args)<br>
=A0 =A0 =A0 $stderr.puts &quot;Hello! You&#39;ve an info message&quot;<br>
=A0 =A0 =A0 super # with super it raises when super undefined<br>
=A0 =A0 end<br>
=A0 end<br>
<br>
=A0 require &#39;logger&#39;<br>
=A0 class Logger<br>
=A0 =A0 prepend MyLogging<br>
=A0 end<br>
<br>
<br>
=A0 class Foo<br>
=A0 =A0 prepend MyLogging<br>
=A0 end<br>
<br>
=A0 <a href=3D"http://Logger.new.info" target=3D"_blank">Logger.new.info</a=
> &#39;message&#39;<br>
=A0 <a href=3D"http://Foo.new.info" target=3D"_blank">Foo.new.info</a> &#39=
;message&#39;<br>
<br>
<br>
In an example <a href=3D"http://Foo.new.info" target=3D"_blank">Foo.new.inf=
o</a> raises an exception while really it shouldn&#39;t in my opinion. So t=
ry_super can be used<br>
<br>
If it doesn&#39;t broke many libraries (I believe not many of them uses sup=
er in cases when it raises), super can be renamed to &#39;super!&#39; and m=
ore mild version can be &#39;super&#39;.<br>
<br>
=3Dend<br>
<br>
<br>
<br>
--<br>
<a href=3D"http://bugs.ruby-lang.org/" target=3D"_blank">http://bugs.ruby-l=
ang.org/</a><br>
<br>
</blockquote></div>

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