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