Pool.php

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<?php
namespace Magento\Framework\Pricing\Price;

class Pool implements \Iterator, \ArrayAccess
{
    protected $prices;

    public function __construct(
        array $prices,
        \Iterator $target = null
    ) {
        $this->prices = $prices;
        foreach ($target ?: [] as $code => $class) {
            if (empty($this->prices[$code])) {
                $this->prices[$code] = $class;
            }
        }
    }

    public function rewind()
    {
        return reset($this->prices);
    }

    public function current()
    {
        return current($this->prices);
    }

    public function key()
    {
        return key($this->prices);
    }

    public function next()
    {
        return next($this->prices);
    }

    public function valid()
    {
        return (bool)$this->key();
    }

    public function get($code)
    {
        return $this->prices[$code];
    }

    public function offsetSet($offset, $value)
    {
        if ($offset === null) {
            $this->prices[] = $value;
        } else {
            $this->prices[$offset] = $value;
        }
    }

    public function offsetExists($offset)
    {
        return isset($this->prices[$offset]);
    }

    public function offsetUnset($offset)
    {
        unset($this->prices[$offset]);
    }

    public function offsetGet($offset)
    {
        return $this->prices[$offset] ?? null;
    }
}