コード例 #1
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 public RunningTotal ApplyPrice(Gbp price, params Item[] items) => new RunningTotal(_remainingBasket.Without(items), Total + price);
コード例 #2
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 private RunningTotal(RemainingBasket remainingBasket, Gbp total)
 {
     _remainingBasket = remainingBasket;
     Total            = total;
 }