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vendor/rails/activesupport/lib/active_support/core_ext/date/behavior.rb

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require 'date'

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module ActiveSupport #:nodoc:

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  module CoreExtensions #:nodoc:

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    module Date #:nodoc:

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      module Behavior

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        # Enable more predictable duck-typing on Date-like classes. See

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        # Object#acts_like?.

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        def acts_like_date?

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          true

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        end

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        # Date memoizes some instance methods using metaprogramming to wrap

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        # the methods with one that caches the result in an instance variable.

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        #

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        # If a Date is frozen but the memoized method hasn't been called, the

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        # first call will result in a frozen object error since the memo

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        # instance variable is uninitialized.

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        #

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        # Work around by eagerly memoizing before freezing.

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        #

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        # Ruby 1.9 uses a preinitialized instance variable so it's unaffected.

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        # This hack is as close as we can get to feature detection:

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        begin

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          ::Date.today.freeze.jd

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        rescue => frozen_object_error

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          if frozen_object_error.message =~ /frozen/

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            def freeze #:nodoc:

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              self.class.private_instance_methods(false).each do |m|

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                if m.to_s =~ /\A__\d+__\Z/

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                  instance_variable_set(:"@#{m}", [send(m)])

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                end

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              end

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              super

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            end

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          end

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        end

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      end

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    end

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  end

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end

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