85 lines
1.5 KiB
Ruby
85 lines
1.5 KiB
Ruby
##
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# Comparable
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#
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# ISO 15.3.3
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module Comparable
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##
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# Return true if +self+ is less
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# than +other+. Otherwise return
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# false.
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#
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# ISO 15.3.3.2.1
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def < other
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cmp = self <=> other
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if cmp.nil?
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raise ArgumentError, "comparison of #{self.class} with #{other.class} failed"
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end
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cmp < 0
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end
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##
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# Return true if +self+ is less
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# than or equal to +other+.
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# Otherwise return false.
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#
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# ISO 15.3.3.2.2
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def <= other
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cmp = self <=> other
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if cmp.nil?
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raise ArgumentError, "comparison of #{self.class} with #{other.class} failed"
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end
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cmp <= 0
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end
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##
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# Return true if +self+ is equal
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# to +other+. Otherwise return
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# false.
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#
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# ISO 15.3.3.2.3
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def == other
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cmp = self <=> other
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cmp == 0
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end
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##
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# Return true if +self+ is greater
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# than +other+. Otherwise return
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# false.
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#
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# ISO 15.3.3.2.4
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def > other
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cmp = self <=> other
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if cmp.nil?
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raise ArgumentError, "comparison of #{self.class} with #{other.class} failed"
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end
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cmp > 0
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end
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##
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# Return true if +self+ is greater
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# than or equal to +other+.
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# Otherwise return false.
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#
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# ISO 15.3.3.2.5
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def >= other
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cmp = self <=> other
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if cmp.nil?
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raise ArgumentError, "comparison of #{self.class} with #{other.class} failed"
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end
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cmp >= 0
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end
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##
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# Return true if +self+ is greater
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# than or equal to +min+ and
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# less than or equal to +max+.
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# Otherwise return false.
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#
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# ISO 15.3.3.2.6
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def between?(min, max)
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self >= min and self <= max
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end
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end
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