From: Peter Hickman <peterhi@...>
Date: 2001-09-01T03:09:42+09:00
Subject: [ruby-talk:20635] Passing procedures

I am building this class that takes a user defined procedure and then
applies it. The test code looks like this:

class TestClass
 def initialize(&process)
  @process = process
 end

 def run()
  if @process == nil then
   puts "No process given"
  else
   @process.call(self, "this", "that")
  end
 end
end

def testfunc(a, b)
 puts "1 -> #{a} 2 -> #{b}"
end

fred = TestClass.new(testfunc)
fred.run

I am expecting the message "1 -> this 2 -> that", what I get is:

test.rb:19:in `testfunc': wrong # of arguments(0 for 2) (ArgumentError)
        from test.rb:19

The problem is the fred = TestClass.new(testfunc) line. It will work if I
put in some parameters but I want the parameter values set when it is called
inside the class, if I declare them on line 19 then I only get those values
back.

Any ideas?