<?php
declare(strict_types=1);
namespace Money;
use IteratorAggregate;
use Money\Exception\UnknownCurrencyException;
use Traversable;
/**
* Implement this to provide a list of currencies.
*/
interface Currencies extends IteratorAggregate
{
/**
* Checks whether a currency is available in the current context.
*/
public function contains(Currency $currency): bool;
/**
* Returns the subunit for a currency.
*
* @throws UnknownCurrencyException If currency is not available in the current context.
*/
public function subunitFor(Currency $currency): int;
/**
* @psalm-return Traversable<int|string, Currency>
*/
public function getIterator(): Traversable;
}