コード例 #1
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 public override Money On(Timestamp time) =>
 new SpecificCard(this.Currency, this.Card.CardOn(time));
コード例 #2
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 public override Money On(Timestamp time) =>
 this.CardOn(time);
コード例 #3
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 public BankCard CardOn(Timestamp time) =>
 time.CompareTo(this.ValidBefore) >= 0
         ? (BankCard) new CardExpired(this.ValidBefore)
         : this;
コード例 #4
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 public int CompareTo(Timestamp other) =>
 - other.CompareTo(this.Value);