From: "Marcin Mielżyński" <lopexx@...>
Date: 2004-08-07T22:56:48+09:00
Subject: const_defined? raises NameError ?

Hi,

Given a const how can I check whether the const exists
without rescuing an exception thrown - if it isn't?
(using const_set is not elegant since You have to supply a special value)

if const_defined?('SomeConst')
	...
end


My next qusetion is:
Assuming there is a nested const:

module SomeModule
	Const="somevalue"
end

the only way to access it by reflection is:

s='SomeModule::Const'
mod,con=s.split(/::/).map{|e|e.strip}
Object.const_get(mod).const_get(con)

wouldn't it be easier if the following worked avoiding any eval calls:

object.const_get('SomeModule::Const')



TIA

Marcin Mielzynski