Created
December 20, 2014 01:26
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クラス変数を使ったカウンタクラス
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| class InstanceCountClass | |
| @@instance_count = 0 | |
| def self.instance_count | |
| @@instance_count | |
| end | |
| def initialize | |
| @@instance_count += 1 | |
| end | |
| end | |
| InstanceCountClass.instance_count | |
| 5.times do | |
| InstanceCountClass.new | |
| end | |
| InstanceCountClass.instance_count | |
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