From: Robert Klemme <shortcutter@...>
Date: 2008-02-26T16:44:55+09:00
Subject: Re: deprecated

On 25.02.2008 23:02, Joel VanderWerf wrote:
> Robert Klemme wrote:
>> This just occurred to me (for Java fans):
>>
>> class Module
>>   def deprecated *meths
>>     meths.each do |me|
>>       aliased = "_deprecate_#{me}"
>>       alias_method aliased, me
>>       class_eval "def #{me}(*a,&b) $stderr.puts 'WARNING: deprecated 
>> method called: #{me}'; #{aliased}(*a,&b) end"
>>     end
>>   end
>> end
> 
> Nice (and I'm not a Java fan). I'd make the output indirect, though, in 
> case of GUI etc. Also, you could use this to only warn on the first call 
> of each method for a given class.
> 
> class Module
>    def deprecated *meths
>      meths.each do |me|
>        aliased = "_deprecate_#{me}"
>        alias_method aliased, me
>        class_eval %{
>          def #{me}(*a,&b)
>            warn_deprecated('#{me}')
>            #{aliased}(*a,&b)
>          end
>        }
>      end
>    end
> end
> 
> class Object
>    def warn_deprecated me
>      warn "WARNING: deprecated method called: #{me}"
>    end
> end

Good idea!  This could even be combined with standard logging libs.

Kind regards

	robert