Struct RateTable 

pub struct RateTable { /* private fields */ }

A pluggable exchange-rate table — the substrate of the Universal Money Amount (money’s UTC). Each currency code maps to its rate versus a chosen reference currency: how many reference units one unit of the currency is worth, exact on the Rational tower (the reference itself is 1). The source is interchangeable — a literal table, a CRDT-synced table, an API fetch — they all produce this same value, so with rates in scope money of different currencies shares one coordinate and cross-currency math becomes meaningful (and exact).

Implementations

impl RateTable

pub fn new() -> Self

pub fn set(&mut self, code: &str, rate: Rational)

Record that 1 <code> = rate reference units (case-insensitive code).

pub fn rate(&self, code: &str) -> Option<&Rational>

The rate of code versus the reference, if known.

pub fn convert(&self, m: &Money, to: Currency) -> Option<Money>

Convert m into to, exact via the Rational tower (normalise to the reference, then to the target), quantised to to’s minor unit. None if either currency’s rate is missing.

Trait Implementations

impl Clone for RateTable

fn clone(&self) -> RateTable

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RateTable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for RateTable

fn default() -> RateTable

Returns the “default value” for a type.