/// <summary>
/// <see cref="ICheckout.Count(string)"/>
/// </summary>
/// <param name="sku">The <see cref="Product.Sku"/> for the scanned products to count.</param>
/// <returns>The number of scanned products with matching <see cref="Product.Sku"/>.</returns>
public int Count(string sku)
{
return(checkout.Count(sku));
}
