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Stored size: 997 Bytes
Contents
# It would nice if we could the following. Then the middle portion of the #Comparable
# method would not be needed. But I fear it might break others code.
#
# module Comparable
#
# def <=>(other)
# comparability.each do |field|
# cmp = send(field) <=> other.send(field); return cmp unless cmp == 0
# end
# end
#
# end
class Module
# Automatically generate sorting definitions based on attribute fields.
#
# include Comparable(:a, :b)
#
# is equivalent to including a module containing:
#
# def <=>(other)
# cmp = self.a <=> other.a; return cmp unless cmp == 0
# cmp = self.b <=> other.b; return cmp unless cmp == 0
# 0
# end
#
def Comparable(*accessors)
define_method(:comparability){ accessors }
code = %{
def <=>(other)
comparability.each do |a|
cmp = (send(a) <=> other.send(a)); return cmp unless cmp == 0
end
end
}
module_eval code
return Comparable
end
end
Version data entries
5 entries across 5 versions & 1 rubygems