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<?php
declare(strict_types=1);
namespace AardsGerds\Game\Shared;
abstract class Collection implements \IteratorAggregate, \Countable
{
protected array $items;
final public function __construct(iterable $items)
$this->items = $items instanceof \Traversable ? iterator_to_array($items) : $items;
$this->assertType();
}
public function getItems(): array
return $this->items;
public function count(): int
return count($this->items);
public function filter(callable $filter): static
return new static(array_filter($this->items, $filter));
public function getIterator(): \ArrayIterator
return new \ArrayIterator($this->items);
abstract protected function getType(): string;
private function assertType(): void
$type = $this->getType();
foreach ($this->items as $item) {
if (!$item instanceof $type) {
throw new \InvalidArgumentException(
sprintf('The object %s is not an instance of %s', get_class($item), $type),
);
Assasz /
aards-gerds
