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<?php
namespace Shrikeh\Collection;
use OuterIterator;
use Shrikeh\Collection\Exception\IncorrectInterface;
/**
* Class RequiresOuterIteratorTrait
* @package Shrikeh\Collection
*/
trait RequiresOuterIteratorTrait
{
* Test that the given class is an instance of OuterIterator
* @param $class
* @throws IncorrectInterface if the class isn't an OuterIterator
private static function testOuterIterator($class)
if (!$class instanceof OuterIterator) {
$msg = 'class %s uses trait %s but it is not an %s';
throw new IncorrectInterface(
sprintf(
$msg,
__CLASS__,
__TRAIT__,
OuterIterator::class
)
);
}
shrikeh /
php-immutable-collections
