From: Karel Michek <KMichek@...>
Date: 2006-07-30T19:41:27+09:00
Subject: 

How should I call eval from member function that binds to global context?
Something like 

$binding = binding
class InterpreterCallback
    def methods(expr)
      begin 
		return eval(expr, $binding).class.instance_methods(false).sort
      rescue ScriptError, StandardError
		printf "ERR: %s\n", $! || 'exception raised'
		return []
      end
     end
end

but this does not work when I am calling InterpreterCallback::methods from C++ (for example when new local variable in the global context is created).

Also I do not understand following

This code:

puts eval("var" ).class
puts eval("var").class.instance_methods(false).sort
var = "";

produces:

NilClass
&
^
inspect
nil?
to_a
to_f
to_i
to_s
|

and this code 

puts eval("var" ).class
puts eval("var").class.instance_methods(false).sort

produces 

undefined local variable or method `var' for main:Object (NameError)

which is exactly what I would expect in the first case also.

Thank you