プログラミングのお題スレ Part12

プログラミングのお題 ..

172:デフォルトの名無しさん
18/10/21 09:40:05.59 UVDgsDD7.net
>>152 GNU Smalltalk
入力は、数値ではなくメッセージで
状態推移は、クラスチェンジで（つまりインスタンス変数なし＆条件分岐なし）
…な感じで、他言語では思いつきにくい実装で遊んでみました
Object subclass: Machine [
wakeUp [ ^self ]
sleep [ ^self ]
hi [ self subclassResponsibility ]
state [ ^self class displayNl ]
Other := nil.
]
Machine class extend [ new [ ^WakeUp basicNew ] ]
Machine subclass: WakeUp [ hi [ 'hello' displayNl ] ]
Machine subclass: Sleep [ hi [ 'zzz...' displayNl ] ]
Machine extend [ Other := Sleep basicNew ]
WakeUp extend [ sleep [ ^self become: Other ] ]
Sleep extend [ wakeUp [ ^self become: Other ] ]
| machine |
machine := Machine new.
machine state. "=> WakeUp "
machine hi. "=> hello "
machine sleep; state. "=> Sleep "
machine hi. "=> zzz... "
machine wakeUp; state. "=> WakeUp "
machine wakeUp; state. "=> WakeUp "
machine sleep; state. "=> Sleep "
machine sleep; state. "=> Sleep "
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