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author | matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2000-04-10 05:48:43 +0000 |
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committer | matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2000-04-10 05:48:43 +0000 |
commit | 620b13d8777086b3b4da0e0a07e93b83ea38b66d (patch) | |
tree | 6dcd08ef584fc777cf34517136d5ce3948840e45 /lib/observer.rb | |
parent | 0453f53db62f1321492288d1c904aade9bb0fa3e (diff) | |
download | ruby-620b13d8777086b3b4da0e0a07e93b83ea38b66d.tar.gz ruby-620b13d8777086b3b4da0e0a07e93b83ea38b66d.tar.xz ruby-620b13d8777086b3b4da0e0a07e93b83ea38b66d.zip |
2000-04-10
git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@661 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib/observer.rb')
-rw-r--r-- | lib/observer.rb | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/lib/observer.rb b/lib/observer.rb index a91c1e38c..08e75f512 100644 --- a/lib/observer.rb +++ b/lib/observer.rb @@ -4,20 +4,20 @@ module Observable def add_observer(observer) - @observer_peers = [] unless @observer_peers + @observer_peers = [] unless defined? @observer_peers unless defined? observer.update raise NameError, "observer needs to respond to `update'" end @observer_peers.push observer end def delete_observer(observer) - @observer_peers.delete observer if @observer_peers + @observer_peers.delete observer if defined? @observer_peers end def delete_observers - @observer_peers.clear if @observer_peers + @observer_peers.clear if defined? @observer_peers end def count_observers - if @observer_peers + if defined? @observer_peers @observer_peers.size else 0 @@ -27,11 +27,15 @@ module Observable @observer_state = state end def changed? - @observer_state + if defined? @observer_state and @observer_state + true + else + false + end end def notify_observers(*arg) - if @observer_state - if @observer_peers + if defined? @observer_state and @observer_state + if defined? @observer_peers for i in @observer_peers.dup i.update(*arg) end |