From: Brad Ottoson <brad@...>
Date: 2008-02-16T16:48:44+09:00
Subject: Code organization and modules

I'm working on an application for generating code skeletons from xml 
template files and have run into a snag.  I'm trying to organize a set 
of code in a directory and inside that use modules.  I have a set of 
files in a subdirectory of my project directory called lang_cpp.  I'll 
paste in some code to show what I'm trying.

--method_constructor.rb(in lang_cpp directory):

module XTECpp::MethodConstructor
  def getDeclaration(codeClass)
    return "        " + codeClass.name + "();\n"
  end
end

--method_destructor.rb(in lang_cpp directory):
module XTECpp::MethodDestructor      
  def getDeclaration(codeClass)
    return "        ~" + codeClass.name + "();\n"
  end
end

Later in some other code I include the files using:
require 'lang_cpp/method_constructor.rb'
require 'lang_cpp/method_destructor.rb'

which seems to work fine.  Later on I try the following:
          case funItem.name
            when "empty_constructor"
              headerString << 
XTECpp::MethodConstructor::getDeclaration(codeClass)
            when "empty_destructor"
              headerString << 
XTECpp::MethodDestructor::getDeclaration(codeClass) 
            when "operator_equality_assignment"
              headerString << 
XTECpp::MethodEqualityAssign::getDeclaration(codeClass)
            when "readugp"
              headerString << 
XTECpp::MethodReadUGP::getDeclaration(codeClass)
          end

 and when I run it I get the error:

C:\code\Ruby\XMLTemplateEngine\lib/lang_cpp/method_constructor.rb:5: 
uninitialized constant XTECpp (NameError)
        from C:\code\Ruby\XMLTemplateEngine\lib/lang_cpp.rb:6:in `require'
        from C:\code\Ruby\XMLTemplateEngine\lib/lang_cpp.rb:6
        from C:/code/Ruby/XMLTemplateEngine/lib/main.rb:6:in `require'
        from C:/code/Ruby/XMLTemplateEngine/lib/main.rb:6

I tried changing the module names to the form XTECpp_MethodConstructor 
so each function was in it's own unique module but I got errors doing 
that too.  I'm not sure if you can ever do things this way in Ruby but 
I'd like to since this organization appeals to me.