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: / opt / alt / ruby34 / share / ri / system / SimpleDelegator /
Filename : cdesc-SimpleDelegator.ri
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U:RDoc::NormalClass[iI"SimpleDelegator:ET@I"Delegator;To:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[	I"NA concrete implementation of Delegator, this class provides the means to ;TI"Sdelegate all supported method calls to the object passed into the constructor ;TI"Kand even to change the object being delegated to at a later time with ;TI"#__setobj__.;To:RDoc::Markup::BlankLine�o:RDoc::Markup::Verbatim;[I"class User
;TI"  def born_on
;TI"    Date.new(1989, 9, 10)
;TI"  end
;TI"	end
;TI"
;TI"require 'delegate'
;TI"
;TI"+class UserDecorator < SimpleDelegator
;TI"  def birth_year
;TI"    born_on.year
;TI"  end
;TI"	end
;TI"
;TI"2decorated_user = UserDecorator.new(User.new)
;TI")decorated_user.birth_year  #=> 1989
;TI"1decorated_user.__getobj__  #=> #<User: ...>
;T:@format0o;	;[I"TA SimpleDelegator instance can take advantage of the fact that SimpleDelegator ;TI"Sis a subclass of +Delegator+ to call <tt>super</tt> to have methods called on ;TI"#the object being delegated to.;T@o;;[I"(class SuperArray < SimpleDelegator
;TI"  def [](*args)
;TI"    super + 1
;TI"  end
;TI"	end
;TI"
;TI"#SuperArray.new([1])[0]  #=> 2
;T;0o;	;[I"CHere's a simple example that takes advantage of the fact that ;TI"DSimpleDelegator's delegation object can be changed at any time.;T@o;;[I"class Stats
;TI"  def initialize
;TI"+    @source = SimpleDelegator.new([])
;TI"  end
;TI"
;TI"  def stats(records)
;TI"%    @source.__setobj__(records)
;TI"
;TI"*    "Elements:  #{@source.size}\n" +
;TI"2    " Non-Nil:  #{@source.compact.size}\n" +
;TI"-    "  Unique:  #{@source.uniq.size}\n"
;TI"  end
;TI"	end
;TI"
;TI"s = Stats.new
;TI",puts s.stats(%w{James Edward Gray II})
;TI"
puts
;TI".puts s.stats([1, 2, 3, nil, 4, 5, 1, 2])
;T;0o;	;[I"Prints:;T@o;;[I"Elements:  4
;TI" Non-Nil:  4
;TI"  Unique:  4
;TI"
;TI"Elements:  8
;TI" Non-Nil:  7
;TI"  Unique:  6;T;0:
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