From: Rasputin <rasputin@...>
Date: 2003-09-04T00:00:13+09:00
Subject: Kernel.const_get and gets


Well, rubberducking has finally failed me.

Using Kernel.const_get() to dynamically create instances seems
to screw up their idea of STDIN. I'm probably missing something
obvious, please can someone enlighten me?

-Program:-----------------------------
1rasputin@lb:roxo$ cat confused.rb
#! /usr/pkg/bin/ruby -w

class Echo
        def echo
                puts "#{self.class} would like a string:"
                puts gets
        end
end

class Rev
        def echo
                puts "#{self.class} would like a string:"
                puts gets.reverse
        end
end

        oldschool = [ Rev.new, Echo.new ]

        dynamic = []
        ARGV.each { |c| dynamic << Kernel.const_get(c).new }

        oldschool.each { |i| i.echo }
        dynamic.each { |i| i.echo }

1rasputin@lb:roxo$
--------------------------------------

-Sample output:-----------------------
0rasputin@lb:roxo$ ./confused.rb
Rev would like a string:
teststr

rtstset
Echo would like a string:
wibble
wibble
0rasputin@lb:roxo$ ./confused.rb Rev Echo
Rev would like a string:
./confused.rb:13:in `gets': No such file or directory - "Rev" (Errno::ENOENT)
        from ./confused.rb:13:in `echo'
        from ./confused.rb:22
        from ./confused.rb:22:in `each'
        from ./confused.rb:22
--------------------------------------

1rasputin@lb:roxo$ ruby -v
ruby 1.6.8 (2002-12-24) [i386-netbsdelf]

Todays CVS gives the same error.

Baffled is an understatement. This is part of a much larger program,
so it's taken me a little while to narrow it down.
-- 
Gee, Toto, I don't think we are in Kansas anymore.
Rasputin :: Jack of All Trades - Master of Nuns