General binary association allows one object to be associated with another. It has a variety of uses, link-lists, simple ordered maps and mixed collections, among them.
NOTE: This class is still fairly experimental.
Associations can be used to draw simple relationships.
:Apple >> :Fruit :Apple >> :Red :Apple.associations #=> [ :Fruit, :Red ]
It can also be used for simple lists of ordered pairs.
c = [ :a >> 1, :b >> 2 ] c.each { |k,v| puts "#{k} associated with #{v} }
produces
a associated with 1 b associated with 2
The method :>> is used to construct the association. It is a rarely used method so it is generally available. But you can't use it for any of the following classes becuase they use #>> for other things.
Bignum Fixnum Date IPAddr Process::Status
# File lib/hashery/association.rb, line 59 def [](index, value) new(index, value) end
# File lib/hashery/association.rb, line 84 def <=>(assoc) return -1 if self.value < assoc.value return 1 if self.value > assoc.value return 0 if self.value == assoc.value end
# File lib/hashery/association.rb, line 100 def inspect %{#{@index.inspect} >> #{@value.inspect}} end
# File lib/hashery/association.rb, line 90 def invert! temp = @index @index = @value @value = temp end
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