using System;
using System.Collections.Generic;
using System.Linq;

namespace BoundaryLab.Domain;

public record InventoryState(int Version, int Available)
{
    public InventoryState? Reserve(int units) => units < 1 || units > Available ? null : new(checked(Version + 1), Available - units);
}
public record ReservationNotice(int Version, int Units);