From: Erik Veenstra <erikveen@...>
Date: 2007-03-06T05:39:02+09:00
Subject: Re: Safe override of Class#new?

> Like to get the opinions of other Ruby experts on this. What
> kind of potential trouble am I asking for by using this?

(Not that I'm a Ruby expert, but anyway...)

You'll run into a real slowdown of your application. AFAIK,
creating objects is one of the most expensive operations in any
OO language. Even when it's implemented in C, as is done with
Ruby.

Yeah, sure, go ahead, implement it in Ruby and slow it down by
a factor of three!... :}

(Just kidding...)

gegroet,
Erik V. - http://www.erikveen.dds.nl/

----------------------------------------------------------------

 require "benchmark"

 class Class
   alias :create :new

   def new_new(*a, &b)
     obj        = allocate
     obj.send(:initialize, *a, &b)
     obj
   end
 end

 times  = 1_000_000

 Benchmark.bmbm do |bm|
   bm.report("old_new") do
     times.times do
       Object.new
     end
   end

   bm.report("new_new") do
     times.times do
       Object.new_new
     end
   end
 end

----------------------------------------------------------------

 <snip/>

               user     system      total        real
 old_new   0.680000   0.010000   0.690000 (  0.687622)
 new_new   1.880000   0.010000   1.890000 (  1.889214)

----------------------------------------------------------------