Module money

Structs§

apply_rate: Apply a percent rate to a base. Shared by tax_amount and discount math.
currency_symbol: Map an ISO 4217 currency code to its conventional display symbol. Returns the code itself as fallback for unknown currencies — callers can still override via Issuer::symbol if they need something exotic.
line_total: Compute line total in minor units: qty * unit_price.
line_total_discounted: Line total after applying at most one of (rate discount, fixed discount). If both are set, rate wins — caller should enforce mutual exclusion at the CLI layer. Result is clamped at zero so a mis-sized fixed discount can’t flip the line negative.
tax_amount: Compute tax amount in minor units: base * rate / 100.