date-once.patch - Backport187 - Ruby Issue Tracking System

Backport #5270 » date-once.patch

Patch that fixes the issue - ddfreyne (Denis Defreyne), 09/03/2011 05:13 PM

       class << self
         def once(*ids) # :nodoc:
           for id in ids
     	module_eval <<-"end;"
     	  alias_method :__#{id.to_i}__, :#{id.to_s}
     	  private :__#{id.to_i}__
     	  def #{id.to_s}(*args, &block)
     	    (@__#{id.to_i}__ ||= [__#{id.to_i}__(*args, &block)])[0]
     	  end
     	end;
         def once(*meths)
           meths.each do |meth|
             # Alias
             orig_meth = '__nonmemoized_' + meth.to_s
             alias_method orig_meth, meth
             # Redefine
             define_method(meth) do |*args|
               # Get cache
               @__memoization_cache ||= {}
               @__memoization_cache[meth] ||= {}
               # Recalculate or fetch
               cache = @__memoization_cache[meth]
               if !cache.has_key?(args)
                 cache[args] = send(orig_meth, *args)
               else
                 result = cache[args]
               end
             end
           end
         end
-...
+      #
       # Using one of the factory methods such as Date::civil is
       # generally easier and safer.
       def initialize(ajd=0, of=0, sg=ITALY) @ajd, @of, @sg = ajd, of, sg end
       def initialize(ajd=0, of=0, sg=ITALY)
         @ajd, @of, @sg = ajd, of, sg
         @__memoization_cache = {}
       end
       # Get the date as an Astronomical Julian Day Number.
       def ajd() @ajd end

     require 'test/unit'
     require 'date'
     class TestDate < Test::Unit::TestCase
       def test_freeze
         foo = Date.new
         foo.freeze
         foo.year
       end
     end

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