From: Logan Capaldo <logancapaldo@...>
Date: 2006-05-11T08:44:46+09:00
Subject: Re: Module#add_tracer


On May 10, 2006, at 7:34 PM, Victor Shepelev wrote:

>
>
> From: Logan Capaldo [mailto:logancapaldo@gmail.com]
>> On May 10, 2006, at 6:45 PM, Victor Shepelev wrote:
>>> class Module
>>>   def add_tracer(meth)
>>>     m_alias = case meth
>>>       when :[] : "old_idx"
>>>       when :+ : "old_plus"
>>>       when :- : "old_minus"
>>>       #and so on
>>>       else ; "old_#{meth}"
>>>     end
>>>     module_eval %Q{
>>>       alias :#{m_alias} :#{meth}
>>>       def #{meth}(*arg, &block)
>>>         puts caller[0] + ": " + self.class.name + "##{meth} called"
>>>         #{m_alias}(*arg, &block)
>>>       end
>>>     }
>>>   end
>>> end
>> --------------------------------------------------  
>> Kernel#set_trace_func
>>       set_trace_func(proc)    => proc
>>       set_trace_func(nil)     => nil
>> --------------------------------------------------------------------- 
>> ---
>>       Establishes proc as the handler for tracing, or disables  
>> tracing
>>       if the parameter is nil. proc takes up to six parameters: an  
>> event
>
> Of cause I know about this. My solution is much more lightweight  
> (because
> only one function of one class would be slow down).
>
> Victor.
>
>

Yours also breaks when someone else overrides the same method and  
aliases it to old_#{meth} (Which, unfortunately is pretty common.)