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require 'htree/modules'
module HTree
# :stopdoc:
def HTree.with_frozen_string_hash
if Thread.current[:htree_frozen_string_hash]
yield
else
begin
Thread.current[:htree_frozen_string_hash] = {}
yield
ensure
Thread.current[:htree_frozen_string_hash] = nil
end
end
end
def HTree.frozen_string(str)
if h = Thread.current[:htree_frozen_string_hash]
if s = h[str]
s
else
str = str.dup.freeze unless str.frozen?
h[str] = str
end
else
str = str.dup.freeze unless str.frozen?
str
end
end
# :startdoc:
end
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