From: Brandon Dimcheff <bdimchef@...>
Date: 2008-10-08T00:16:46+09:00
Subject: Re: Difference between Foo = Class.new and class Foo

hmm, interesting.  I'm definitely going to have to use set_trace_func  
more often.  Do you know if there's any way to tell which c function  
is being called for the c-calls?  Like how does the ruby method  
"inherited" map to rb_... in MRI?

Thanks,
Brandon

On Oct 7, 2008, at 10:56, Robert Klemme wrote:

> 2008/10/7 Brandon Dimcheff <bdimchef@wieldim.com>:
>> and then do "Foo = Class.new",  I get "new called" printed to  
>> stdout.  If I
>> do "class Foo..." I get nothing.  So it seems that the "class"  
>> keyword does
>> not end up calling new on Class when you define a new class.  Does  
>> anybody
>> know what's going on here?  Is something else called instead?
>
> Looks like there is a shortcut:
>
> 16:55:57 bas$ ruby -e 'set_trace_func lambda {|*a|p a}; class Foo;end'
> ["line", "-e", 1, nil, #<Binding:0x1002f0d4>, false]
> ["c-call", "-e", 1, :inherited, #<Binding:0x1002ef80>, Class]
> ["c-return", "-e", 1, :inherited, #<Binding:0x1002ef44>, Class]
> ["class", "-e", 1, nil, #<Binding:0x1002ed64>, false]
> ["end", "-e", 1, nil, nil, false]
> 16:56:13 bas$ ruby -e 'set_trace_func lambda {|*a|p a}; Foo=Class.new'
> ["line", "-e", 1, nil, #<Binding:0x1002f0e8>, false]
> ["c-call", "-e", 1, :new, #<Binding:0x1002f0ac>, Class]
> ["c-call", "-e", 1, :initialize, #<Binding:0x1002eeb8>, Class]
> ["c-call", "-e", 1, :inherited, #<Binding:0x1002edb4>, Class]
> ["c-return", "-e", 1, :inherited, #<Binding:0x1002ed78>, Class]
> ["c-return", "-e", 1, :initialize, #<Binding:0x1002ec88>, Class]
> ["c-return", "-e", 1, :new, #<Binding:0x1002eb98>, Class]
> 16:56:44 bas$
>
> If you need hooks for class creation look closely at ":inherited"  
> above.
>
> Kind regards
>
> robert
>
> -- 
> remember.guy do |as, often| as.you_can - without end
>