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61 lines
1.8 KiB
Plaintext
61 lines
1.8 KiB
Plaintext
# This file is part of NIT ( http://www.nitlanguage.org ).
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This module beef up the clock module by allowing a clock to be comparable.
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# It show the usage of class refinement
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module clock_more
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import clock
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redef class Clock
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# Clock are now comparable
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super Comparable
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# Comparaison of a clock make only sense with an other clock
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redef type OTHER: Clock
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redef fun <(o)
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do
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# Note: < is the only abstract method of Comparable.
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# All other operators and methods rely on < and ==.
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return self.total_minutes < o.total_minutes
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end
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end
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var c1 = new Clock(8, 12)
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var c2 = new Clock(8, 13)
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var c3 = new Clock(9, 13)
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print "{c1}<{c2}? {c1<c2}"
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print "{c1}<={c2}? {c1<=c2}"
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print "{c1}>{c2}? {c1>c2}"
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print "{c1}>={c2}? {c1>=c2}"
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print "{c1}<=>{c2}? {c1<=>c2}"
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print "{c1},{c2}? max={c1.max(c2)} min={c1.min(c2)}"
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print "{c1}.is_between({c2}, {c3})? {c1.is_between(c2, c3)}"
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print "{c2}.is_between({c1}, {c3})? {c2.is_between(c1, c3)}"
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print "-"
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c1.minutes += 1
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print "{c1}<{c2}? {c1<c2}"
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print "{c1}<={c2}? {c1<=c2}"
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print "{c1}>{c2}? {c1>c2}"
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print "{c1}>={c2}? {c1>=c2}"
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print "{c1}<=>{c2}? {c1<=>c2}"
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print "{c1},{c2}? max={c1.max(c2)} min={c1.min(c2)}"
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print "{c1}.is_between({c2}, {c3})? {c1.is_between(c2, c3)}"
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print "{c2}.is_between({c1}, {c3})? {c2.is_between(c1, c3)}"
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