From: Robert Klemme <shortcutter@...>
Date: 2008-10-07T23:56:35+09:00
Subject: Re: Difference between Foo = Class.new and class Foo

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

-- 
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