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author | zzak <zzak@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-07-10 15:50:23 +0000 |
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committer | zzak <zzak@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-07-10 15:50:23 +0000 |
commit | 0357488b439b37922171ad72cc7839736ff757a3 (patch) | |
tree | c629d9a28db7d856c76fc2e028c36a2c5109d818 /lib | |
parent | e82591d0ca4edb0df5de1b323437fdcd6dcbd0bd (diff) | |
download | ruby-0357488b439b37922171ad72cc7839736ff757a3.tar.gz |
* lib/delegate.rb: Add example for __setobj__ and __getobj__
[Bug #8615] Patch by Caleb Thompson
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41905 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib')
-rw-r--r-- | lib/delegate.rb | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/delegate.rb b/lib/delegate.rb index e46e4f8c23..a2ca46fafa 100644 --- a/lib/delegate.rb +++ b/lib/delegate.rb @@ -230,6 +230,34 @@ end # and even to change the object being delegated to at a later time with # #__setobj__. # +# class User +# def born_on +# Date.new(1989, 09, 10) +# end +# end +# +# class UserDecorator < SimpleDelegator +# def birth_year +# born_on.year +# end +# end +# +# decorated_user = UserDecorator.new(User.new) +# decorated_user.birth_year #=> 1989 +# decorated_user.__getobj__ #=> #<User: ...> +# +# A SimpleDelegator instance can take advantage of the fact that SimpleDelegator +# is a subclass of +Delegator+ to call <tt>super</tt> to have methods called on +# the object being delegated to. +# +# class SuperArray < SimpleDelegator +# def [](*args) +# super + 1 +# end +# end +# +# SuperArray.new([1])[0] #=> 2 +# # Here's a simple example that takes advantage of the fact that # SimpleDelegator's delegation object can be changed at any time. # |