set: speed up Set#include?

* lib/set.rb (initialize): internal hash defaults to false

* lib/set.rb (include?): use Hash#[] for optimized dispatch.
  Patch by Ismael Abreu <[email protected]>
  [ruby-core:67664] [Misc #10754]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49568 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/set.rb b/lib/set.rb
index f00cfac0c5..a3f185538f 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -78,7 +78,7 @@ class Set
   # If a block is given, the elements of enum are preprocessed by the
   # given block.
   def initialize(enum = nil, &block) # :yields: o
-    @hash ||= Hash.new
+    @hash ||= Hash.new(false)
 
     enum.nil? and return
 
@@ -209,7 +209,7 @@ class Set
 
   # Returns true if the set contains the given object.
   def include?(o)
-    @hash.include?(o)
+    @hash[o]
   end
   alias member? include?