Module: Uninheritable

Defined in:
lib/carat/uninheritable.rb

Overview

Introduction

Allows an object to declare itself as unable to be subclassed. The technique behind this is very simple (redefinition of #inherited), so this just provides an easier way to do the same thing with a consistent error message.

Usage

require 'uninheritable'

class A
  extend Uninheritable
end

class B < A; end # => raises TypeError

Info

Copyright

Copyright © 2003 Austin Ziegler

Licence

MIT-Style

Version

1.2.0

Licence

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Constant Summary collapse

VERSION = 
"1.2.0"

Instance Method Summary collapse

Instance Method Details

#inherited(klass) ⇒ Object

Redefines a class’s #inherited definition to prevent subclassing of the class extended by this module.

Raises:

  • (TypeError) 


65
66
67
 
# File 'lib/carat/uninheritable.rb', line 65

def inherited(klass)
  raise TypeError, "Class #{self} cannot be subclassed."
end