class CodeUnitCollectionIterator

final class CodeUnitCollectionIterator implements Iterator {
    
    /**
     * @psalm-var list<CodeUnit>
     */
    private array $codeUnits;
    private int $position = 0;
    public function __construct(CodeUnitCollection $collection) {
        $this->codeUnits = $collection->asArray();
    }
    public function rewind() : void {
        $this->position = 0;
    }
    public function valid() : bool {
        return isset($this->codeUnits[$this->position]);
    }
    public function key() : int {
        return $this->position;
    }
    public function current() : CodeUnit {
        return $this->codeUnits[$this->position];
    }
    public function next() : void {
        $this->position++;
    }

}