CS fundamentals and algorithms

Inventory domain design

You're designing a Swift inventory system that processes receive, reserve, sell, and cancel operations in sequence. What domain type protects the invariants on stock quantities?

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One Inventory value type per product holds onHand and reserved, accepts every operation only through mutating methods that check reserved <= onHand and reject negatives inside, and uses private(set) so nothing outside can change the quantity fields directly.

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Inventory domain design

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