Class SimpleDelegator
In: lib/delegate.rb
Parent: Delegator

A concrete implementation of Delegator, this class provides the means to delegate all supported method calls to the object passed into the constructor and even to change the object being delegated to at a later time with __setobj__ .

Methods

__getobj__   __setobj__   clone   dup   new  

Public Class methods

Pass in the obj you would like to delegate method calls to.

[Source]

     # File lib/delegate.rb, line 200
200:   def initialize(obj)
201:     super
202:     @_sd_obj = obj
203:   end

Public Instance methods

Returns the current object method calls are being delegated to.

[Source]

     # File lib/delegate.rb, line 206
206:   def __getobj__
207:     @_sd_obj
208:   end

Changes the delegate object to obj.

It‘s important to note that this does not cause SimpleDelegator‘s methods to change. Because of this, you probably only want to change delegation to objects of the same type as the original delegate.

Here‘s an example of changing the delegation object.

  names = SimpleDelegator.new(%w{James Edward Gray II})
  puts names[1]    # => Edward
  names.__setobj__(%w{Gavin Sinclair})
  puts names[1]    # => Sinclair

[Source]

     # File lib/delegate.rb, line 224
224:   def __setobj__(obj)
225:     raise ArgumentError, "cannot delegate to self" if self.equal?(obj)
226:     @_sd_obj = obj
227:   end

Clone support for the object returned by __getobj__.

[Source]

     # File lib/delegate.rb, line 230
230:   def clone
231:     new = super
232:     new.__setobj__(__getobj__.clone)
233:     new
234:   end

Duplication support for the object returned by __getobj__.

[Source]

     # File lib/delegate.rb, line 236
236:   def dup
237:     new = super
238:     new.__setobj__(__getobj__.clone)
239:     new
240:   end

[Validate]