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compar.rb@ 321

Last change on this file since 321 was 321, checked in by coas-nagasima, 7 years ago
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1	##
2	# Comparable
3	#
4	# ISO 15.3.3
5	module Comparable
6
7	##
8	# Return true if +self+ is less
9	# than +other+. Otherwise return
10	# false.
11	#
12	# ISO 15.3.3.2.1
13	def < other
14	cmp = self <=> other
15	if cmp.nil?
16	raise ArgumentError, "comparison of #{self.class} with #{other.class} failed"
17	end
18	cmp < 0
19	end
20
21	##
22	# Return true if +self+ is less
23	# than or equal to +other+.
24	# Otherwise return false.
25	#
26	# ISO 15.3.3.2.2
27	def <= other
28	cmp = self <=> other
29	if cmp.nil?
30	raise ArgumentError, "comparison of #{self.class} with #{other.class} failed"
31	end
32	cmp <= 0
33	end
34
35	##
36	# Return true if +self+ is equal
37	# to +other+. Otherwise return
38	# false.
39	#
40	# ISO 15.3.3.2.3
41	def == other
42	cmp = self <=> other
43	cmp == 0
44	end
45
46	##
47	# Return true if +self+ is greater
48	# than +other+. Otherwise return
49	# false.
50	#
51	# ISO 15.3.3.2.4
52	def > other
53	cmp = self <=> other
54	if cmp.nil?
55	raise ArgumentError, "comparison of #{self.class} with #{other.class} failed"
56	end
57	cmp > 0
58	end
59
60	##
61	# Return true if +self+ is greater
62	# than or equal to +other+.
63	# Otherwise return false.
64	#
65	# ISO 15.3.3.2.5
66	def >= other
67	cmp = self <=> other
68	if cmp.nil?
69	raise ArgumentError, "comparison of #{self.class} with #{other.class} failed"
70	end
71	cmp >= 0
72	end
73
74	##
75	# Return true if +self+ is greater
76	# than or equal to +min+ and
77	# less than or equal to +max+.
78	# Otherwise return false.
79	#
80	# ISO 15.3.3.2.6
81	def between?(min, max)
82	self >= min and self <= max
83	end
84	end

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